HG/T 2806-1996 Austenitic stainless steel pressure vessel manufacturing management rules
Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2806--1996
Austenitic Stainless Steel Pressure Vessels
Manufacturing Management Rules
1996-0526 Issued
Ministry of Chemical Industry of the People's Republic of China
199703-01 Implementation
This standard is formulated to ensure the safety and reliability of austenitic stainless steel pressure vessels in production and use, and to strengthen the quality management of austenitic stainless steel pressure vessels. It is improved and revised on the basis of the "Regulations on the Management of Stainless Steel Pressure Vessels Manufacturing" of the Ministry of Chemical Industry, and non-equivalently adopts the relevant requirements of Chapter F.3 (1981 edition) of the "Construction Code for Non-Direct Fire Pressure Vessels" of France (CODAP), as well as GB150-89 "Steel Pressure Vessels", HGJ18-89 "Technical Requirements for the Manufacturing of Steel Chemical Vessels", and "Regulations on Safety Technical Supervision of Pressure Vessels" (1990 edition) issued by the Ministry of Labor.
Austenitic stainless steel pressure vessels are widely used like pressure vessels of other materials. However, in view of the characteristics of austenitic stainless steel materials, in order to reduce the factors that may cause defects or harm to stainless steel due to lax management during the manufacturing process, from a macro perspective, the basic requirements that each manufacturing unit must comply with during the manufacturing process are stipulated.
This standard is different from the pressure vessel product standard and is a management standard that each manufacturing unit must comply with. This standard is proposed by China National Chemical Equipment Corporation. This standard is under the jurisdiction of the Chemical Machinery Research Institute of the Ministry of Chemical Industry. This standard is drafted by China National Chemical Equipment Corporation, the Chemical Machinery Research Institute of the Ministry of Chemical Industry, and Shanghai Chemical Machinery Plant No. 1.
The main drafters of this standard: Zhang Sheng, Hua Tianding, Yang Jiansheng, Lu Yixin, Zhang Ya. 1. Scope
Chemical Industry Standard of the People's Republic of China
Manufacturing Management Rules for Austenitic Stainless Steel Pressure Vessels HG/T2806-1998
This standard specifies the basic requirements that manufacturers of pressure vessels and components made of austenitic stainless steel and composite austenitic stainless steel (hereinafter referred to as stainless steel) must comply with in manufacturing management. This standard applies to units that manufacture stainless steel pressure vessels and stainless steel pressure vessel components. In addition to complying with the relevant product standards and the "Interim Regulations on Safety Supervision of Boiler Pressure Vessels" and implementation rules issued by the Ministry of Labor, the "Safety Technical Supervision Regulations for Pressure Vessels", "Safety Supervision Regulations for Liquefied Gas Tank Cars", "Safety Supervision Regulations for Liquefied Gas Railway Tank Cars" and product drawings and technical documents approved through prescribed procedures, the manufacture of stainless steel pressure vessels shall also comply with the provisions of this standard. The manufacture of non-austenitic or lined stainless steel pressure vessels and atmospheric pressure stainless steel containers can also refer to this standard. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard by being referenced in this standard. At the time of publication of the standard, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB150-89 Steel pressure vessel
GB.1031-83 Surface roughness parameters and values GB4334.1-84 Stainless steel 10% oxalic acid etch test method GB4334.2-84 Stainless steel sulfuric acid-ferric sulfate corrosion test method-GB4334.3-84 Stainless steel 65% nitric acid corrosion test method GB4334.4-84 Stainless steel nitric acid-hydrofluoric acid corrosion test method GB4334.5-84 Stainless steel sulfuric acid-copper sulfate corrosion test method JB4708-92 Steel welded pressure vessel welding process assessment JB/T4709-92 Steel welded pressure vessel welding code ZBG93001-87 Urea high pressure equipment manufacturing inspection method ultra-low Preparation of samples for intergranular corrosion tendency test of carbon austenitic stainless steel ZBG93002-87
Urea high-pressure equipment manufacturing inspection method Ultra-low carbon austenitic stainless steel intergranular corrosion tendency test ZBG93003-87 Urea high-pressure equipment manufacturing inspection method Ultra-low carbon austenitic stainless steel selective corrosion inspection and metallographic inspection Ministry of Labor issued the 1990 version of the Safety Technical Supervision Regulations for Pressure Vessels 3 Requirements
3.1 Materials
3.1.1 Stainless steel materials and welding materials used in the manufacture of pressure vessels shall comply with the provisions of the corresponding national standards or industry standards, and have a quality certificate from the material manufacturer. When using foreign materials, they shall comply with the provisions of Article 22 of the "Safety Technical Supervision Regulations for Pressure Vessels". 3.1.2 The re-inspection requirements for materials used for major pressure-bearing components shall comply with the provisions of Article 61 of the "Safety Technical Supervision Regulations for Pressure Vessels". 3.1.3 The scope of use of stainless steel materials and stainless steel composite steel plates shall comply with the provisions of GB150. 3.1.4 If the design drawings stipulate that the raw materials need to be re-tested for intergranular corrosion resistance, the shape, size, processing and test method of the re-test specimens shall comply with the provisions of GB4334.I~4334.5 unless otherwise specified in the design drawings: The intergranular corrosion performance test of ultra-low carbon austenitic stainless steel materials used to manufacture urea high-pressure equipment shall be in accordance with the provisions of ZBG93001~93003. 3.1.5 The materials used to manufacture stainless steel pressure vessels shall not be delaminated, and the surface shall not have defects such as cracks and scars. The stainless plates used to manufacture equipment with surface roughness requirements shall be polished with 80~100 sand heads before checking the surface quality. The surface of the materials supplied after pickling is not allowed to have scale and over-pickling.
3.1.6 Stainless steel raw materials and stainless steel composite steel plates should be stored according to brand, specification and furnace batch number, and clearly marked. Strict isolation measures should be taken from raw materials such as carbon steel.
3.1.7 Stainless steel materials should have clear storage marks. This mark and the marks specified in Article 3.1.6 should be written with nitrogen-free and sulfur-free markers. Oil balls and other contaminated materials should not be used. Steel stamps should not be made on the surface in contact with the medium. 3.1.8 Raw materials should be placed securely and neatly to prevent damage (scratches, bumps, indentations) and bending. Bulk bright plates should be placed upright on wooden racks with a 15° slope.
3.1.9 Welding materials should be classified and placed in a dry and well-ventilated room according to type, brand, batch, and storage time. Generally, they should be placed on a shelf about 200 to 500 mm above the ground. The room should be clean and tidy, and no harmful gases and corrosive media are allowed to be placed. A system for acceptance, management, drying, distribution and recycling of products should be established.
3.1.10 When lifting steel plates, deformation of steel plates should be prevented. Steel wire ropes should be sheathed to prevent damage to the surface of the material. 3.2 Manufacturing environment
3.2.1 The manufacture of stainless steel pressure vessels should have an independent, closed production workshop or special site, which should be strictly isolated from carbon steel products. If stainless steel pressure vessels are equipped with carbon steel parts, the manufacturing site of their carbon steel parts should be separated from stainless steel parts. 3.2.2 In order to prevent contamination by iron ions and other harmful impurities, the production site of stainless steel pressure vessels must be kept clean and dry, and rubber or wooden pads should be installed on the ground. The stacking of semi-finished and finished parts should be equipped with technical stacking racks. 3.2.3 Special roller racks (such as rollers lined with rubber, etc.), hoisting clamps and other process equipment should be used in the manufacturing process of stainless steel pressure vessels. The lifting cable for lifting containers or parts should be a rope cable or a flexible material (rubber, plastic, etc.) armored cable. Personnel entering the production site should wear work shoes with no sharp foreign objects such as nails on the soles. 3.2.4 During the turnover and transportation of stainless steel materials or parts, necessary transportation tools should be equipped to prevent iron ion pollution and scratches. 3.2.5 The surface treatment of stainless steel pressure vessels should have an independent site equipped with necessary environmental protection measures. 3.3 Processing, forming and welding
3.3.1 Batch production must be marked according to the sample, and the sample can be made of galvanized iron sheet. 3.3.2 Marking should be carried out on a clean wooden board or a smooth platform. It is strictly forbidden to use a steel needle to mark or stamp the surface of stainless steel materials that cannot be removed during processing.
3.3.3 When cutting, the stainless steel raw materials should be moved to a special site and cut by plasma cutting or mechanical cutting. If the plate is cut or perforated by plasma cutting, and welding is required after cutting, the oxide at the cut should be removed until the metallic luster is exposed. When mechanical cutting is used, the machine tool should be cleaned before cutting. To prevent scratches on the plate surface, the presser foot should be wrapped with soft materials such as rubber. It is strictly forbidden to cut directly on the stainless steel material pile.
3.3.4 There should be no cracks, indentations, tears, etc. on the cut and edges of the plate. 3.3.5 The cut materials should be neatly stacked on the base frame so that they can be lifted together with the base frame. Soft materials such as rubber, wood, blankets, etc. should be placed between the plates to prevent damage to the surface.
3.3.6 Round steel and pipes can be cut by lathe, saw blade or grinding wheel cutting machine. If welding is required, the grinding wheel debris and burrs at the cut must be removed. 3.3.7 Marking of stainless steel pressure component materials Transplantation and inspection confirmation marks should be written on the appropriate positions of each component material according to the requirements of Article 3.1.7, and written records of material cutting should be made. 3.3.8 When rolling stainless steel plates, the surface of the roll of the plate rolling machine or the surface of the stainless steel should be covered with iron-free materials. 3.3.9 When drilling, turning and other mechanical processing are carried out, the coolant is generally a water-based emulsion. 3.3.10 Stainless steel parts should be heat-processed or heat-treated after removing grease and other impurities with a non-chlorine liquid degreasing agent. The combustion gas in the furnace of the heating furnace used in the heat processing or heat treatment process should be neutral or slightly oxidizing. After heat processing or heat treatment, the sulfur content of the fuel oil used for heating parts that do not need to remove the metal surface should be less than 0.3%. It is strictly forbidden to use coal or coke for heating. 3.3.11 When hot forming is used for stainless steel heads, the furnace overflow and the starting and ending temperatures of stamping should be strictly controlled according to the requirements of heat treatment specifications and stamping process, and records should be kept. It is not allowed to heat in the same furnace as carbon steel heads. The tools and dies used for hot forming must be clean, and no dirt such as carbon steel chips and oxide scales are allowed. 3.3.12 For stainless steel heads, elbows, forgings and other parts that are formed by hot processing, if there are requirements for intergranular corrosion resistance, they should be tested for intergranular corrosion resistance according to the requirements of Article 3.1.4 after hot processing. If the material of the parts does not meet the requirements of the intergranular corrosion resistance test after hot processing, solid solution or stabilization treatment should be carried out: the solid solution or stabilization treatment should have a record of the heat treatment process and the relationship curve between the heat treatment time and temperature, and the intergranular corrosion resistance test should be carried out after heat treatment.
During the assembly of the shell, the temporary mold iron, pad and other tools that contact the shell surface should be made of stainless steel materials that are compatible with the shell.
3.3.14 Stainless steel pressure vessels are strictly prohibited from being assembled by force, and tools that may cause iron ion contamination shall not be used during the assembly process. The opening of the container shall be made by plasma or mechanical cutting. 3.3.15 The welding process assessment before welding of stainless steel pressure vessels and the first welding steel type, the first welding materials and welding methods, as well as the welding process assessment before welding when any important factor or additional factor in the welding process that has been assessed to be qualified is changed shall comply with the provisions of JB4708, and the welding procedures shall comply with the provisions of JB/T4709. 3.3.16 The welder must hold a valid welder certificate of the corresponding category issued by the labor department. 3.3.17 Before welding, the oil stains and other debris at the weld joints shall be cleaned with a chlorine-free liquid degreasing agent or other methods. The groove cut by plasma should be polished to a metallic luster. 3.3.18 During welding, carbon steel is not allowed to be used as grounding clamp. The grounding clamp should be fastened to the workpiece, and spot welding is prohibited. 3.3.19 The welding of stainless steel pressure vessels should strictly follow the welding process specifications and strictly control the temperature between weld layers. When using carbon arc gouging to clean the weld root, carburization must be strictly prevented. The carburized layer must be polished and removed. When welding stainless steel pressure vessels with intergranular corrosion resistance requirements, the welds in contact with the working medium should be welded last.
3.3.20 When welding, arc welding shall not be directly applied to the non-welding surface of stainless steel. When manual arc welding is used, there should be a 100mm anti-splash coating on both sides of the weld to facilitate the removal of spatter. 3.3.21 Unqualified welds can be repaired, but the number of repairs on the same part should not exceed two times. For welds that are still unqualified after two repairs, if they are repaired again, each time they must be approved by the technical person in charge of the manufacturing unit, and the number of repairs, locations and repair conditions must be recorded in the product quality certificate. For parts with intergranular corrosion resistance requirements, the original requirements should still be guaranteed after the welds are repaired. 3.3.22 Welding test plates of stainless steel pressure vessel products with intergranular corrosion resistance requirements should be subjected to intergranular corrosion tests according to the design drawings. The intergranular corrosion test method should comply with the provisions of Article 3.1.4. 3.3.23 During the manufacturing process, sharp and hard materials should be avoided from scratching the stainless steel surface. If work is carried out inside the container, protective measures such as laying pads should be taken.
If there are local bruises or scratches on the surface of the stainless steel pressure vessel that affect the corrosion resistance, they must be repaired. 3.3.24
3.3.25 The nameplate seat material of the stainless steel pressure vessel should be stainless steel. 3.4 Surface treatment
3.4.1 After all weld repair work of stainless steel pressure vessels is completed, surface treatment shall be carried out according to the requirements of the design drawings. 3.4.2 Welding spatter, slag, oxide scale, weld scar, pits, oil stains and other impurities on the surface of the pressure vessel shall be cleaned up. Carbon steel brushes shall not be used to clean the surface of stainless steel pressure vessels during the cleaning process. 3.4.3 When mechanical polishing is adopted, aluminum oxide or chromium oxide shall be used as polishing abrasives. Iron sand and other abrasives shall not be used as abrasives. Abrasives shall be separated according to different particle sizes and shall not be mixed.
.3.4.4 Each polishing wheel can only bond abrasives of one particle size. After the polishing wheel is bonded with abrasives, the drying temperature and drying time shall be strictly controlled according to different abrasives.
HG/T2806-1996
3.4.5 The polishing grade should be gradually increased from coarse to fine. After rough polishing, a ten-fold magnifying glass should be used for surface inspection. If small pits are found in local areas, the small pits should be polished clean and no obvious pits are allowed before fine polishing. 3.4.6 During the entire polishing process, the surface temperature of the polishing layer should always be controlled to prevent deformation and overheating, and the consistency of the polishing texture should be maintained. The polishing grade shall be evaluated in accordance with the provisions of GB1031 and shall meet the requirements of the design drawings. 3.4.7 When electrochemical polishing or other methods are used for polishing, process tests shall be carried out in advance, and the workpiece shall be polished in accordance with the process requirements.
3.4, 8 All pressure vessels or pressure-bearing components made of austenitic stainless steel and composite steel plates with anti-corrosion requirements shall be pickled and passivated. Pickling and passivation should be mainly etched, and wet mopping or pickling passivation agent coating can also be used. 3.4.9 Before pickling, the workpiece must be degreased with gasoline, alkali solution or detergent, and rinsed with water. It is not allowed to use carbon steel wire brushes to brush the surface of the workpiece.
3, 4.10 For all stainless steel pressure vessels with carbon steel parts and components, effective measures should be taken during the pickling process to prevent the carbon steel parts from being corroded. 3.4.11. The workpiece must be subjected to process tests before pickling and passivation, and a suitable formula and operation process must be formulated. The pickling and passivation liquid should be sampled and tested regularly, and the concentration should be corrected in time.
3.4.12 After pickling, there should be no obvious traces of corrosion liquid on the surface of stainless steel, no uneven color patterns, no oxidation color on the weld and hot processing surface, and it should be rinsed with water after pickling, and there should be no residual pickling liquid. The passivated stainless steel surface should be rinsed with water, and wiped dry after it becomes neutral.
3.4.13 After surface treatment of stainless steel pressure vessels with anti-intergranular corrosion requirements, the passivation film inspection should be avoided on the surface in contact with the medium. The inspection of the purification membrane should be carried out according to the design drawings. If there is no provision in the design drawings, the inspection should be carried out according to the blue dot method. If the blue dot appears within 30 seconds, it is unqualified. 3.4.14 Neutralization measures should be taken for the pickling liquid to be discharged, and it can only be discharged after meeting the national wastewater discharge standards. 4 Pressure test and packaging and transportation
4.1 After the stainless steel pressure vessel is manufactured, the pressure test should be carried out according to the provisions of the design drawings. 4.2 After the water pressure test of the stainless steel pressure vessel, the water should be drained immediately and the water marks should be blown dry. For non-corrosive media, if it is impossible to blow on the water marks due to structural reasons, the nitrogen ion content of the test water shall not exceed 25PPm. 4.3 If the passivation film on the surface in contact with the medium is damaged during the pressure test, air tightness test and packaging of stainless steel pressure vessels, re-passivation measures should be taken in time.
4.4 After the stainless steel pressure vessel is manufactured, all sealing surfaces and pipe openings should be properly protected in time. The carbon steel part of the container should be painted with protective paint, and the stainless steel part generally does not need to be painted unless otherwise required by the design drawings. 4.5 Effective measures must be taken to prevent iron ion contamination and equipment surface damage during transportation of stainless steel pressure vessels. People's Republic of China
Chemical Industry Standard
Austenitic Stainless Steel Pressure Vessels
Manufacturing Management Rules
HG/T 2806-1996
Editor China National Chemical Equipment Corporation
Postal Code 100011
Printer Beijing University of Chemical Technology
Copyright reserved
Reproduction prohibited
Format 880×12301/16
First edition July 1996
9661-9082
8.4 thousand words
First printing July 19969 When drilling, machining, turning and other mechanical processing are performed, water-based emulsion is generally used as the coolant. 3.3.10 Stainless steel parts should be treated with non-chlorine liquid degreasing agent to remove grease and other impurities before hot processing or heat treatment. The combustion gas in the furnace of the heating furnace used in the hot processing or heat treatment process should be neutral or slightly oxidizing. After hot processing or heat treatment, the parts that do not need to remove the metal surface should have a sulfur content of less than 0.3% in the fuel oil used for heating. It is strictly forbidden to use coal or coke for heating. 3.3.11 When hot forming is used for stainless steel heads, the overflow in the furnace and the starting and ending temperatures of the stamping should be strictly controlled according to the requirements of the heat treatment specifications and the stamping process, and records should be kept. It is not allowed to heat in the same furnace with carbon steel heads. The tools and dies used for hot forming must be clean, and no dirt such as carbon steel chips and oxide scale is allowed. 3.3.12 For stainless steel heads, elbows, forgings and other parts that are formed by heat processing, if there is a requirement for intergranular corrosion resistance, they should be tested for intergranular corrosion resistance according to the requirements of Article 3.1.4 after heat processing. If the material of the parts does not meet the requirements of the intergranular corrosion resistance test after heat processing, they should be subjected to solid solution or stabilization treatment: the solid solution or stabilization treatment should have a record of the heat treatment process and the heat treatment time and temperature relationship curve, and the intergranular corrosion resistance test should be carried out after heat treatment.
During the assembly of the shell, the temporary mold iron, pads and other tools that contact the shell surface should be made of stainless steel materials that are suitable for the shell.
3.3.14 It is strictly forbidden to assemble stainless steel pressure vessels by force, and tools that may cause iron ion contamination shall not be used during the assembly process. The opening of the container should be made by plasma or mechanical cutting. 3.3.15 The welding process assessment before welding of stainless steel pressure vessels and the steel type for the first welding, the welding materials and welding methods used for the first time, as well as the welding process assessment before welding when any important factor or additional factor in the welding process that has been assessed as qualified is changed shall comply with the provisions of JB4708, and the welding procedures shall comply with the provisions of JB/T4709. 3.3.16 The welders who weld must hold a valid welder qualification certificate of the corresponding category issued by the labor department. 3.3.17 Before welding, the oil stains and other debris at the weld joints shall be cleaned with a chlorine-free liquid degreasing agent or other methods. The grooves cut by plasma should be polished to a metallic luster. 3.3.18 During welding, carbon steel is not allowed to be used as the ground clamp. The ground clamp should be fastened to the workpiece, and spot welding is prohibited. 3.3.19 The welding of stainless steel pressure vessels shall strictly follow the welding process specifications and strictly control the temperature between weld layers. When using carbon arc gouging to clean the weld root, carburization shall be strictly prevented and the carburized layer shall be polished and removed. When welding stainless steel pressure vessels with intergranular corrosion resistance requirements, the welds in contact with the working medium should be welded last.
3.3.20 When welding, arc welding shall not be directly applied to the non-welding surface of stainless steel. When manual arc welding is used, there shall be a 100mm anti-splash coating on both sides of the weld to facilitate the removal of splashes. 3.3.21 Unqualified welds are allowed to be repaired, but the number of repairs on the same part shall not exceed two times. For welds that are still unqualified after two repairs, if they are repaired again, each time they must be approved by the technical person in charge of the manufacturing unit, and the number of repairs, parts and repair conditions shall be recorded in the product quality certificate. For parts with intergranular corrosion resistance requirements, the original requirements shall still be guaranteed after the welds are repaired. 3.3.22 The welded test plates of stainless steel pressure vessels with intergranular corrosion resistance requirements shall be subjected to intergranular corrosion tests according to the design drawings. The intergranular corrosion test method shall comply with the provisions of Article 3.1.4. 3.3.23 During the manufacturing process, sharp and hard objects shall be avoided from scratching the stainless steel surface. If work is carried out inside the container, protective measures such as laying pads shall be taken.
If there are local bruises or scratches on the surface of the stainless steel pressure vessel that affect the corrosion resistance, they must be repaired. 3.3.24
3.3.25 The nameplate seat of the stainless steel pressure vessel shall be made of stainless steel. 3.4 Surface treatment
3.4.1 After all weld repair work of the stainless steel pressure vessel is completed, the surface treatment shall be carried out according to the requirements of the design drawings. 3.4.2 Welding spatter, slag, oxide scale, weld scar, pits, oil stains and other impurities on the surface of the pressure vessel shall be cleaned up, and carbon steel brushes shall not be used to clean the surface of the stainless steel pressure vessel during the cleaning process. 3.4.3 When mechanical polishing is used, aluminum oxide or chromium oxide should be used as polishing abrasives. Iron sand and other abrasives should not be used as abrasives. Abrasives should be separated according to different particle sizes and should not be mixed.
.3.4.4 Each polishing wheel can only be bonded with abrasives of one particle size. After the polishing wheel is bonded with abrasives, the drying temperature and drying time should be strictly controlled according to different abrasives.
HG/T2806-1996
3.4.5 The polishing grade should be gradually increased from coarse to fine. After rough polishing, a ten-fold magnifying glass should be used to inspect the surface. If small pits are found in local areas, the small pits should be polished clean and no obvious pits are allowed before fine polishing. 3.4.6 During the entire polishing process, the surface temperature of the polishing layer should always be controlled to prevent deformation and overheating, and the consistency of the polishing texture should be maintained. The polishing grade shall be evaluated in accordance with the provisions of GB1031 and shall meet the requirements of the design drawings. 3.4.7 When electrochemical polishing or other polishing methods are used, process tests should be conducted in advance, and the workpiece should be polished in accordance with the process requirements.
3.4, 8 All austenitic stainless steel and composite steel plate pressure vessels or pressure-bearing components with corrosion resistance requirements should be pickled and passivated. Pickling and passivation should be mainly etched, and wet mopping or pickling passivation agent coating can also be used. 3.4.9 Before pickling, the workpiece must be degreased with gasoline, alkali solution or detergent, and rinsed with water. It is not allowed to use carbon steel wire brushes to brush the surface of the workpiece.
3, 4.10 If there are carbon steel parts and components on stainless steel pressure vessels, effective measures should be taken during the pickling process to prevent the carbon steel parts from being corroded. 3.4.11. The workpiece must be subjected to process tests before pickling and passivation, and a suitable formula and operating process must be formulated. The pickling and passivation solution should be sampled and tested regularly, and the concentration should be corrected in time.
3.4.12 After pickling, the stainless steel surface shall not have obvious traces of corrosion liquid, uneven color patterns, and the welds and hot processing surfaces shall not have oxidation colors. After pickling, it must be rinsed with water and no residual pickling liquid should be left. The passivated stainless steel surface should be rinsed with water, and the water marks should be wiped dry after it becomes neutral.
3.4.13 After the surface treatment of stainless steel pressure vessels with intergranular corrosion resistance requirements, the passivation film inspection should be avoided on the surface in contact with the medium. The inspection of the purification membrane should be carried out according to the design drawings. If there is no provision in the design drawings, the inspection should be carried out according to the blue dot method. If the blue dot appears within 30 seconds, it is unqualified. 3.4.14 Neutralization measures should be taken for the pickling liquid to be discharged, and it can only be discharged after meeting the national wastewater discharge standards. 4 Pressure test and packaging and transportation
4.1 After the stainless steel pressure vessel is manufactured, it should be subjected to pressure test according to the design drawings. 4.2 After the water pressure test of the stainless steel pressure vessel, the water should be drained immediately and the water marks should be blown dry. For non-corrosive media, if it is impossible to blow to the water mark due to structural reasons, the nitrogen ion content of the test water shall not exceed 25PPm. 4.3 During the pressure test, air tightness test and packaging process of stainless steel pressure vessels, if the passivation film on the surface in contact with the medium is damaged, re-passivation measures should be taken in time.
4.4 After the stainless steel pressure vessel is manufactured, all sealing surfaces and pipe openings should be appropriately protected in time. The carbon steel part of the container should be coated with protective paint, and the stainless steel part generally does not need to be painted for protection unless otherwise required by the design drawings. 4.5 Effective measures must be taken to prevent iron ion contamination and damage to the equipment surface during transportation of stainless steel pressure vessels. People's Republic of China
Chemical Industry Standard
Austenitic Stainless Steel Pressure Vessels
Manufacturing Management Rules
HG/T 2806-1996
Editor China National Chemical Equipment Corporation
Postal Code 100011
Printer Beijing University of Chemical Technology
Copyright reserved
Reproduction prohibited
Format 880×12301/16
First edition July 1996
9661-9082
8.4 thousand words
First printing July 19969 When drilling, machining, turning and other mechanical processing are performed, water-based emulsion is generally used as the coolant. 3.3.10 Stainless steel parts should be treated with non-chlorine liquid degreasing agent to remove grease and other impurities before hot processing or heat treatment. The combustion gas in the furnace of the heating furnace used in the hot processing or heat treatment process should be neutral or slightly oxidizing. After hot processing or heat treatment, the parts that do not need to remove the metal surface should have a sulfur content of less than 0.3% in the fuel oil used for heating. It is strictly forbidden to use coal or coke for heating. 3.3.11 When hot forming is used for stainless steel heads, the overflow in the furnace and the starting and ending temperatures of the stamping should be strictly controlled according to the requirements of the heat treatment specifications and the stamping process, and records should be kept. It is not allowed to be heated in the same furnace as the carbon steel heads. The tools and dies used for hot forming must be clean, and no dirt such as carbon steel chips and oxide scale is allowed. 3.3.12 For stainless steel heads, elbows, forgings and other parts that are formed by heat processing, if there is a requirement for intergranular corrosion resistance, they should be tested for intergranular corrosion resistance according to the requirements of Article 3.1.4 after heat processing. If the material of the parts does not meet the requirements of the intergranular corrosion resistance test after heat processing, they should be subjected to solid solution or stabilization treatment: the solid solution or stabilization treatment should have a record of the heat treatment process and the heat treatment time and temperature relationship curve, and the intergranular corrosion resistance test should be carried out after heat treatment.
During the assembly of the shell, the temporary mold iron, pads and other tools that contact the shell surface should be made of stainless steel materials that are suitable for the shell.
3.3.14 It is strictly forbidden to assemble stainless steel pressure vessels by force, and tools that may cause iron ion contamination shall not be used during the assembly process. The opening of the container should be made by plasma or mechanical cutting. 3.3.15 The welding process assessment before welding of stainless steel pressure vessels and the steel type for the first welding, the welding materials and welding methods used for the first time, as well as the welding process assessment before welding when any important factor or additional factor in the welding process that has been assessed as qualified shall comply with the provisions of JB4708, and the welding procedures shall comply with the provisions of JB/T4709. 3.3.16 The welders who weld must hold a valid welder certificate of the corresponding category issued by the labor department. 3.3.17 Before welding, the oil stains and other debris at the weld joints shall be cleaned with a chlorine-free liquid degreasing agent or other methods. The grooves cut by plasma should be polished to a metallic luster. 3.3.18 During welding, carbon steel is not allowed to be used as the ground clamp. The ground clamp should be fastened to the workpiece, and spot welding is prohibited. 3.3.19 The welding of stainless steel pressure vessels shall strictly follow the welding process specifications and strictly control the temperature between weld layers. When using carbon arc gouging to clean the weld root, carburization shall be strictly prevented and the carburized layer shall be polished and removed. When welding stainless steel pressure vessels with intergranular corrosion resistance requirements, the welds in contact with the working medium should be welded last.
3.3.20 When welding, arc welding shall not be directly applied to the non-welding surface of stainless steel. When manual arc welding is used, there shall be a 100mm anti-splash coating on both sides of the weld to facilitate the removal of splashes. 3.3.21 Unqualified welds are allowed to be repaired, but the number of repairs on the same part shall not exceed two times. For welds that are still unqualified after two repairs, if they are repaired again, each time they must be approved by the technical person in charge of the manufacturing unit, and the number of repairs, parts and repair conditions shall be recorded in the product quality certificate. For parts with intergranular corrosion resistance requirements, the original requirements shall still be guaranteed after the welds are repaired. 3.3.22 The welded test plates of stainless steel pressure vessels with intergranular corrosion resistance requirements shall be subjected to intergranular corrosion tests according to the design drawings. The intergranular corrosion test method shall comply with the provisions of Article 3.1.4. 3.3.23 During the manufacturing process, sharp and hard objects shall be avoided from scratching the stainless steel surface. If work is carried out inside the container, protective measures such as laying pads shall be taken.
If there are local bruises or scratches on the surface of the stainless steel pressure vessel that affect the corrosion resistance, they must be repaired. 3.3.24
3.3.25 The nameplate seat of the stainless steel pressure vessel shall be made of stainless steel. 3.4 Surface treatment
3.4.1 After all weld repair work of the stainless steel pressure vessel is completed, the surface treatment shall be carried out according to the requirements of the design drawings. 3.4.2 Welding spatter, slag, oxide scale, weld scar, pits, oil stains and other impurities on the surface of the pressure vessel shall be cleaned up, and carbon steel brushes shall not be used to clean the surface of the stainless steel pressure vessel during the cleaning process. 3.4.3 When mechanical polishing is used, aluminum oxide or chromium oxide should be used as polishing abrasives. Iron sand and other abrasives should not be used as abrasives. Abrasives should be separated according to different particle sizes and should not be mixed.
.3.4.4 Each polishing wheel can only be bonded with abrasives of one particle size. After the polishing wheel is bonded with abrasives, the drying temperature and drying time should be strictly controlled according to different abrasives.
HG/T2806-1996
3.4.5 The polishing grade should be gradually increased from coarse to fine. After rough polishing, a ten-fold magnifying glass should be used to inspect the surface. If small pits are found in local areas, the small pits should be polished clean and no obvious pits are allowed before fine polishing. 3.4.6 During the entire polishing process, the surface temperature of the polishing layer should always be controlled to prevent deformation and overheating, and the consistency of the polishing texture should be maintained. The polishing grade shall be evaluated in accordance with the provisions of GB1031 and shall meet the requirements of the design drawings. 3.4.7 When electrochemical polishing or other polishing methods are used, process tests should be conducted in advance, and the workpiece should be polished in accordance with the process requirements.
3.4, 8 All austenitic stainless steel and composite steel plate pressure vessels or pressure-bearing components with corrosion resistance requirements should be pickled and passivated. Pickling and passivation should be mainly etched, and wet mopping or pickling passivation agent coating can also be used. 3.4.9 Before pickling, the workpiece must be degreased with gasoline, alkali solution or detergent, and rinsed with water. It is not allowed to use carbon steel wire brushes to brush the surface of the workpiece.
3, 4.10 If there are carbon steel parts and components on stainless steel pressure vessels, effective measures should be taken during the pickling process to prevent the carbon steel parts from being corroded. 3.4.11. The workpiece must be subjected to process tests before pickling and passivation, and a suitable formula and operating process must be formulated. The pickling and passivation solution should be sampled and tested regularly, and the concentration should be corrected in time.
3.4.12 After pickling, the stainless steel surface shall not have obvious traces of corrosion liquid, uneven color patterns, and the welds and hot processing surfaces shall not have oxidation colors. After pickling, it must be rinsed with water and no residual pickling liquid should be left. The passivated stainless steel surface should be rinsed with water, and the water marks should be wiped dry after it becomes neutral.
3.4.13 After the surface treatment of stainless steel pressure vessels with intergranular corrosion resistance requirements, the passivation film inspection should be avoided on the surface in contact with the medium. The inspection of the purification membrane should be carried out according to the design drawings. If there is no provision in the design drawings, the inspection should be carried out according to the blue dot method. If the blue dot appears within 30 seconds, it is unqualified. 3.4.14 Neutralization measures should be taken for the pickling liquid to be discharged, and it can only be discharged after meeting the national wastewater discharge standards. 4 Pressure test and packaging and transportation
4.1 After the stainless steel pressure vessel is manufactured, it should be subjected to pressure test according to the design drawings. 4.2 After the water pressure test of the stainless steel pressure vessel, the water should be drained immediately and the water marks should be blown dry. For non-corrosive media, if it is impossible to blow to the water mark due to structural reasons, the nitrogen ion content of the test water shall not exceed 25PPm. 4.3 During the pressure test, air tightness test and packaging process of stainless steel pressure vessels, if the passivation film on the surface in contact with the medium is damaged, re-passivation measures should be taken in time.
4.4 After the stainless steel pressure vessel is manufactured, all sealing surfaces and pipe openings should be appropriately protected in time. The carbon steel part of the container should be coated with protective paint, and the stainless steel part generally does not need to be painted for protection unless otherwise required by the design drawings. 4.5 Effective measures must be taken to prevent iron ion contamination and damage to the equipment surface during transportation of stainless steel pressure vessels. People's Republic of China
Chemical Industry Standard
Austenitic Stainless Steel Pressure Vessels
Manufacturing Management Rules
HG/T 2806-1996
Editor China National Chemical Equipment Corporation
Postal Code 100011
Printer Beijing University of Chemical Technology
Copyright reserved
Reproduction prohibited
Format 880×12301/16
First edition July 1996
9661-9082
8.4 thousand words
First printing July 199611 When hot forming is used for stainless steel heads, the furnace overflow and the starting and ending temperatures of stamping should be strictly controlled according to the requirements of heat treatment specifications and stamping process, and records should be kept. It is not allowed to heat in the same furnace as carbon steel heads. The tools and dies used for hot forming must be clean, and no dirt such as carbon steel chips and oxide scales are allowed. 3.3.12 For stainless steel heads, elbows, forgings and other parts that are formed by hot processing, if there are requirements for intergranular corrosion resistance, they should be tested for intergranular corrosion resistance according to the requirements of Article 3.1.4 after hot processing. If the material of the parts does not meet the requirements of the intergranular corrosion resistance test after hot processing, solid solution or stabilization treatment should be carried out: the solid solution or stabilization treatment should have a record of the heat treatment process and the relationship curve between the heat treatment time and temperature, and the intergranular corrosion resistance test should be carried out after heat treatment.
During the assembly of the shell, the temporary mold iron, pad and other tools that contact the shell surface should be made of stainless steel materials that are compatible with the shell.
3.3.14 Stainless steel pressure vessels are strictly prohibited from being assembled by force, and tools that may cause iron ion contamination shall not be used during the assembly process. The opening of the container shall be made by plasma or mechanical cutting. 3.3.15 The welding process assessment before welding of stainless steel pressure vessels and the first welding steel type, the first welding materials and welding methods, as well as the welding process assessment before welding when any important factor or additional factor in the welding process that has been assessed to be qualified is changed shall comply with the provisions of JB4708, and the welding procedures shall comply with the provisions of JB/T4709. 3.3.16 The welder must hold a valid welder certificate of the corresponding category issued by the labor department. 3.3.17 Before welding, the oil stains and other debris at the weld joints shall be cleaned with a chlorine-free liquid degreasing agent or other methods. The groove cut by plasma should be polished to a metallic luster. 3.3.18 During welding, carbon steel is not allowed to be used as grounding clamp. The grounding clamp should be fastened to the workpiece, and spot welding is prohibited. 3.3.19 The welding of stainless steel pressure vessels should strictly follow the welding process specifications and strictly control the temperature between weld layers. When using carbon arc gouging to clean the weld root, carburization must be strictly prevented. The carburized layer must be polished and removed. When welding stainless steel pressure vessels with intergranular corrosion resistance requirements, the welds in contact with the working medium should be welded last.
3.3.20 When welding, arc welding shall not be directly applied to the non-welding surface of stainless steel. When manual arc welding is used, there should be a 100mm anti-splash coating on both sides of the weld to facilitate the removal of spatter. 3.3.21 Unqualified welds can be repaired, but the number of repairs on the same part should not exceed two times. For welds that are still unqualified after two repairs, if they are repaired again, each time they must be approved by the technical person in charge of the manufacturing unit, and the number of repairs, locations and repair conditions must be recorded in the product quality certificate. For parts with intergranular corrosion resistance requirements, the original requirements should still be guaranteed after the welds are repaired. 3.3.22 Welding test plates of stainless steel pressure vessel products with intergranular corrosion resistance requirements should be subjected to intergranular corrosion tests according to the design drawings. The intergranular corrosion test method should comply with the provisions of Article 3.1.4. 3.3.23 During the manufacturing process, sharp and hard materials should be avoided from scratching the stainless steel surface. If work is carried out inside the container, protective measures such as laying pads should be taken.
If there are local bruises or scratches on the surface of the stainless steel pressure vessel that affect the corrosion resistance, they must be repaired. 3.3.24
3.3.25 The nameplate seat material of the stainless steel pressure vessel should be stainless steel. 3.4 Surface treatment
3.4.1 After all weld repair work of stainless steel pressure vessels is completed, surface treatment shall be carried out according to the requirements of the design drawings. 3.4.2 Welding spatter, slag, oxide scale, weld scar, pits, oil stains and other impurities on the surface of the pressure vessel shall be cleaned up. Carbon steel brushes shall not be used to clean the surface of stainless steel pressure vessels during the cleaning process. 3.4.3 When mechanical polishing is adopted, aluminum oxide or chromium oxide shall be used as polishing abrasives. Iron sand and other abrasives shall not be used as abrasives. Abrasives shall be separated according to different particle sizes and shall not be mixed.
.3.4.4 Each polishing wheel can only bond abrasives of one particle size. After the polishing wheel is bonded with abrasives, the drying temperature and drying time shall be strictly controlled according to different abrasives.
HG/T2806-1996
3.4.5 The polishing grade should be gradually increased from coarse to fine. After rough polishing, a ten-fold magnifying glass should be used for surface inspection. If small pits are found in local areas, the small pits should be polished clean and no obvious pits are allowed before fine polishing. 3.4.6 During the entire polishing process, the surface temperature of the polishing layer should always be controlled to prevent deformation and overheating, and the consistency of the polishing texture should be maintained. The polishing grade shall be evaluated in accordance with the provisions of GB1031 and shall meet the requirements of the design drawings. 3.4.7 When electrochemical polishing or other methods are used for polishing, process tests shall be carried out in advance, and the workpiece shall be polished in accordance with the process requirements.
3.4, 8 All pressure vessels or pressure-bearing components made of austenitic stainless steel and composite steel plates with anti-corrosion requirements shall be pickled and passivated. Pickling and passivation should be mainly etched, and wet mopping or pickling passivation agent coating can also be used. 3.4.9 Before pickling, the workpiece must be degreased with gasoline, alkali solution or detergent, and rinsed with water. It is not allowed to use carbon steel wire brushes to brush the surface of the workpiece.
3, 4.10 For all stainless steel pressure vessels with carbon steel parts and components, effective measures should be taken during the pickling process to prevent the carbon steel parts from being corroded. 3.4.11. The workpiece must be subjected to process tests before pickling and passivation, and a suitable formula and operation process must be formulated. The pickling and passivation liquid should be sampled and tested regularly, and the concentration should be corrected in time.
3.4.12 After pickling, there should be no obvious traces of corrosion liquid on the surface of stainless steel, no uneven color patterns, no oxidation color on the weld and hot processing surface, and it should be rinsed with water after pickling, and there should be no residual pickling liquid. The passivated stainless steel surface should be rinsed with water, and wiped dry after it becomes neutral.
3.4.13 After surface treatment of stainless steel pressure vessels with anti-intergranular corrosion requirements, the passivation film inspection should be avoided on the surface in contact with the medium. The inspection of the purification membrane should be carried out according to the design drawings. If there is no provision in the design drawings, the inspection should be carried out according to the blue dot method. If the blue dot appears within 30 seconds, it is unqualified. 3.4.14 Neutralization measures should be taken for the pickling liquid to be discharged, and it can only be discharged after meeting the national wastewater discharge standards. 4 Pressure test and packaging and transportation
4.1 After the stainless steel pressure vessel is manufactured, the pressure test should be carried out according to the provisions of the design drawings. 4.2 After the water pressure test of the stainless steel pressure vessel, the water should be drained immediately and the water marks should be blown dry. For non-corrosive media, if it is impossible to blow on the water marks due to structural reasons, the nitrogen ion content of the test water shall not exceed 25PPm. 4.3 If the passivation film of the surface in contact with the medium is damaged during the pressure test, air tightness test and packaging of stainless steel pressure vessels, re-passivation measures should be taken in time.
4.4 After the stainless steel pressure vessel is manufactured, all sealing surfaces and pipe openings should be properly protected in time. The carbon steel part of the container should be painted with protective paint, and the stainless steel part generally does not need to be painted unless otherwise required by the design drawings. 4.5 Effective measures must be taken to prevent iron ion contamination and equipment surface damage during transportation of stainless steel pressure vessels. People's Republic of China
Chemical Industry Standard
Austenitic Stainless Steel Pressure Vessels
Manufacturing Management Rules
HG/T 2806-1996
Editor China National Chemical Equipment Corporation
Postal Code 100011
Printer Beijing University of Chemical Technology
Copyright reserved
Reproduction prohibited
Format 880×12301/16
First edition July 1996
9661-9082
8.4 thousand words
First printing July 199611 When hot forming is used for stainless steel heads, the furnace overflow and the starting and ending temperatures of stamping should be strictly controlled according to the requirements of heat treatment specifications and stamping process, and records should be kept. It is not allowed to heat in the same furnace as carbon steel heads. The tools and dies used for hot forming must be clean, and no dirt such as carbon steel chips and oxide scales are allowed. 3.3.12 For stainless steel heads, elbows, forgings and other parts that are formed by hot processing, if there are requirements for intergranular corrosion resistance, they should be tested for intergranular corrosion resistance according to the requirements of Article 3.1.4 after hot processing. If the material of the parts does not meet the requirements of the intergranular corrosion resistance test after hot processing, solid solution or stabilization treatment should be carried out: the solid solution or stabilization treatment should have a record of the heat treatment process and the relationship curve between the heat treatment time and temperature, and the intergranular corrosion resistance test should be carried out after heat treatment.
During the assembly of the shell, the temporary mold iron, pad and other tools that contact the shell surface should be made of stainless steel materials that are compatible with the shell.
3.3.14 Stainless steel pressure vessels are strictly prohibited from being assembled by force, and tools that may cause iron ion contamination shall not be used during the assembly process. The opening of the container shall be made by plasma or mechanical cutting. 3.3.15 The welding process assessment before welding of stainless steel pressure vessels and the first welding steel type, the first welding materials and welding methods, as well as the welding process assessment before welding when any important factor or additional factor in the welding process that has been assessed to be qualified is changed shall comply with the provisions of JB4708, and the welding procedures shall comply with the provisions of JB/T4709. 3.3.16 The welder must hold a valid welder certificate of the corresponding category issued by the labor department. 3.3.17 Before welding, the oil stains and other debris at the weld joints shall be cleaned with a chlorine-free liquid degreasing agent or other methods. The groove cut by plasma should be polished to a metallic luster. 3.3.18 During welding, carbon steel is not allowed to be used as grounding clamp. The grounding clamp should be fastened to the workpiece, and spot welding is prohibited. 3.3.19 The welding of stainless steel pressure vessels should strictly follow the welding process specifications and strictly control the temperature between weld layers. When using carbon arc gouging to clean the weld root, carburization must be strictly prevented. The carburized layer must be polished and removed. When welding stainless steel pressure vessels with intergranular corrosion resistance requirements, the welds in contact with the working medium should be welded last.
3.3.20 When welding, arc welding shall not be directly applied to the non-welding surface of stainless steel. When manual arc welding is used, there should be a 100mm anti-splash coating on both sides of the weld to facilitate the removal of spatter. 3.3.21 Unqualified welds can be repaired, but the number of repairs on the same part should not exceed two times. For welds that are still unqualified after two repairs, if they are repaired again, each time they must be approved by the technical person in charge of the manufacturing unit, and the number of repairs, locations and repair conditions must be recorded in the product quality certificate. For parts with intergranular corrosion resistance requirements, the original requirements should still be guaranteed after the welds are repaired. 3.3.22 Welding test plates of stainless steel pressure vessel products with intergranular corrosion resistance requirements should be subjected to intergranular corrosion tests according to the design drawings. The intergranular corrosion test method should comply with the provisions of Article 3.1.4. 3.3.23 During the manufacturing process, sharp and hard materials should be avoided from scratching the stainless steel surface. If work is carried out inside the container, protective measures such as laying pads should be taken.
If there are local bruises or scratches on the surface of the stainless steel pressure vessel that affect the corrosion resistance, they must be repaired. 3.3.24
3.3.25 The nameplate seat material of the stainless steel pressure vessel should be stainless steel. 3.4 Surface treatment
3.4.1 After all weld repair work of stainless steel pressure vessels is completed, surface treatment shall be carried out according to the requirements of the design drawings. 3.4.2 Welding spatter, slag, oxide scale, weld scar, pits, oil stains and other impurities on the surface of the pressure vessel shall be cleaned up. Carbon steel brushes shall not be used to clean the surface of stainless steel pressure vessels during the cleaning process. 3.4.3 When mechanical polishing is adopted, aluminum oxide or chromium oxide shall be used as polishing abrasives. Iron sand and other abrasives shall not be used as abrasives. Abrasives shall be separated according to different particle sizes and shall not be mixed.
.3.4.4 Each polishing wheel can only bond abrasives of one particle size. After the polishing wheel is bonded with abrasives, the drying temperature and drying time shall be strictly controlled according to different abrasives.
HG/T2806-1996
3.4.5 The polishing grade should be gradually increased from coarse to fine. After rough polishing, a ten-fold magnifying glass should be used for surface inspection. If small pits are found in local areas, the small pits should be polished clean and no obvious pits are allowed before fine polishing. 3.4.6 During the entire polishing process, the surface temperature of the polishing layer should always be controlled to prevent deformation and overheating, and the consistency of the polishing texture should be maintained. The polishing grade shall be evaluated in accordance with the provisions of GB1031 and shall meet the requirements of the design drawings. 3.4.7 When electrochemical polishing or other methods are used for polishing, process tests shall be carried out in advance, and the workpiece shall be polished in accordance with the process requirements.
3.4, 8 All pressure vessels or pressure-bearing components made of austenitic stainless steel and composite steel plates with anti-corrosion requirements shall be pickled and passivated. Pickling and passivation should be mainly etched, and wet mopping or pickling and passivation agent coating can also be used. 3.4.9 Before pickling, the workpiece must be degreased with gasoline, alkali solution or detergent, and rinsed with water. It is not allowed to use carbon steel wire brushes to brush the surface of the workpiece. Www.bzxZ.net
3, 4.10 For all stainless steel pressure vessels with carbon steel parts and components, effective measures should be taken during the pickling process to prevent the carbon steel parts from being corroded. 3.4.11. The workpiece must be subjected to process tests before pickling and passivation, and a suitable formula and operation process must be formulated. The pickling and passivation liquid should be sampled and tested regularly, and the concentration should be corrected in time.
3.4.12 After pickling, there should be no obvious traces of corrosion liquid on the surface of stainless steel, no uneven color patterns, no oxidation color on the weld and hot processing surface, and it should be rinsed with water after pickling, and there should be no residual pickling liquid. The passivated stainless steel surface should be rinsed with water, and wiped dry after it becomes neutral.
3.4.13 After surface treatment of stainless steel pressure vessels with anti-intergranular corrosion requirements, the passivation film inspection should be avoided on the surface in contact with the medium. The inspection of the purification membrane should be carried out according to the design drawings. If there is no provision in the design drawings, the inspection should be carried out according to the blue dot method. If the blue dot appears within 30 seconds, it is unqualified. 3.4.14 Neutralization measures should be taken for the pickling liquid to be discharged, and it can only be discharged after meeting the national wastewater discharge standards. 4 Pressure test and packaging and transportation
4.1 After the stainless steel pressure vessel is manufactured, the pressure test should be carried out according to the provisions of the design drawings. 4.2 After the water pressure test of the stainless steel pressure vessel, the water should be drained immediately and the water marks should be blown dry. For non-corrosive media, if it is impossible to blow on the water marks due to structural reasons, the nitrogen ion content of the test water shall not exceed 25PPm. 4.3 If the passivation film on the surface in contact with the medium is damaged during the pressure test, air tightness test and packaging of stainless steel pressure vessels, re-passivation measures should be taken in time.
4.4 After the st
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