HG 20225-1995 Specification for Construction and Acceptance of Chemical Metal Pipeline Engineering
Some standard content:
Industry Standard of the People's Republic of China
HG 20225 - 95
Metallie Piping Construction and AcceptanueCode for Chemical Engineering1995 - 03 — 27
Ministry of Chemical Industry of the People's Republic of China
1995 - 07 01
Industry Standard of the People's Republic of China
Construction and Acceptance Specification for Metal Pipe Engineering in Chemical Industry
HG20225-95
Main Unit: Construction Standard of Ministry of Chemical Industry, China Approval Department: Ministry of Chemical Industry
Implementation Period: July 1, 1995
Document of Ministry of Chemical Industry
No. 187-187 of Chemical Industry Construction Development (1995) of Ministry of Chemical Industry
Notice on the "Construction and Acceptance Specification for Metal Pipe Engineering in Chemical Industry"
To all provinces, autonomous regions, municipalities directly under the Central Government, chemical industry departments (information), companies directly under the Ministry, design institutes, construction enterprises and construction project headquarters: The Ministry entrusted the Construction Standard of Ministry of Chemical Industry, China Chemical Industry Management Center Station to be responsible for the compilation The "Construction and Acceptance Specifications for Metal Pipeline Engineering in Chemical Industry" has been approved as the chemical industry standard of the People's Republic of China after review by relevant units, with the number HG20225·95, and will be implemented from July 1, 1996. The original high-pressure pipeline construction and acceptance technical specifications (trial) (Chemical 501-4 and low-pressure pipeline construction acceptance technical specifications (trial) (Chemical 502-74) will be abolished at the same time. This standard is required for the supervision and interpretation of the chemical industry. It is issued by the Construction Standards Center of the Ministry of Chemical Industry. For relevant matters, please contact the center (address: Gouzhong Middle Road, Shijiazhuang City, Hebei Province, zip code: 050021). Ministry of Chemical Industry
March 13, 1996
Preparation Instructions || The Ministry of Chemical Industry has formulated the Chemical Pipeline Engineering Standardization Management Center, which has formulated the Chemical Pipeline Engineering Standardization and Acceptance Specification. After the review meeting was held with the Ministry of Chemical Industry Document No. (94) 212, the standard was finalized. This standard systematically summarizes the experience of chemical industry pipeline engineering, design, production and other aspects, and comprehensively revises the original chemical industry pipeline engineering standardization and acceptance specification. In terms of pipeline classification, pipe making, determination of radiographic inspection ratio according to medium diameter and pressure, heat treatment of parts, pressure test, etc., it basically adopts foreign advanced standards or makes appropriate adjustments to foreign advanced standards. In terms of terms, technical terms, delivery technical documents and the implementation of the construction investment unit responsibility system, it fully reflects the current situation and characteristics of my country's chemical industry and has a close relationship with the international standards. This standard has been aligned with the chemical industry standards and relevant national standards that have been frequently issued in recent years. The book has 1 chapter, 38 sections, 34 articles and 5 appendices: Chapter 1 General, which stipulates the applicability and general requirements of this standard; Chapter 2 Terminology; Chapter 3 to 4 stipulate the technical contents of the assembly of pipeline components and supports, pipeline adjustment, welding, installation, inspection and testing, system acceptance and cleaning, pipeline coating, insulation and project handover acceptance. When each unit implements this standard, it should seriously summarize the experience and pay great attention to the backlog of information and materials, and please give us feedback in time for improvement and revision. The Ministry of Chemical Industry is responsible for the construction coordination of this standard and is responsible for its management and interpretation. The publication and distribution of this standard and the consultation of specific documents shall be the responsibility of the Construction Standardization Management Center of the Ministry of Chemical Industry. The communication address of the station is Huaizhong Middle Road, Youjiazhuang City, Hebei Province. (Mail: 656621> Tel: (0311) 6014921-508 Construction Coordination Department of the Ministry of Chemical Industry
March 21, 1995
Acceptance of pipe fabrics and bearing parts 3.1
3.2 Steel sales
3.3 Pipe fittings
5.4 Nonferrous metal pipes
Other parts
Bacteria support, point
Back processing
Tube production
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High screw and sealing surface processing
Smooth casing processing
Pipe replacement
General regulations
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and the heat and potential pit
road installation
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quality control A sound standard installation
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5.11 self-built safety meter
pipeline inspection, modification and test...
general machine determination
should be the total loss structure
(4r:2)
(404)
（405)
The radiation and the ultrasonic wave monitoring will be used for the inspection
7.5 for the first cleaning of the general system
! Pipeline paint health
10 pipeline insulation
11 acceptance inspection
Appendix A: chemical composition, mechanical properties and hardness of steel pipes and fittings with careful attachment 13 commonly used compression ignition light, nuts Chemical composition, primary performance and hardness value of non-ferrous metal deaf materials and plates. Appendix 11 Technical standards for common non-ferrous metal deaf materials and plates. Appendix 11 Common sizes and dimensions of the slope and size of the slope and size of the slope. Appendix 11 Technical documents for delivery and delivery. Notes on this standard. 1 General provisions. 1.0.1 Improve the construction level of metallurgical industry metallurgical equipment and ensure the quality of the project. This edition of the standard is formulated: 1.0.2 This standard is used for the acceptance of the construction of metal pipelines in the chemical industry. 1.0.3 The media used in the pipelines of the chemical industry are divided into four categories: A-type pipelines are used to transport medium with a certain temperature; C-type pipelines are used to transport combustible or non-combustible media; and D-type pipelines are used to transport non-combustible and non-combustible media. Among them, the pipes with a design capacity of 1Mp and a design temperature of 25~186 are classified as Class 1 pipes. 10.4 The standard process of metal pipelines in the chemical industry shall be carried out according to the design documents. When the design documents have provisions on quality that are lower than this standard, the design unit shall put forward the basis for ensuring safety and compliance with the case and confirm it with the construction unit. 1.0.5 The design unit shall be fully responsible for the compliance with this standard and shall conduct inspections on the implementation process and construction quality through its authorized inspection or supervision agency.
1.0.6 The filter plant must have a complete quality system, implement this specification, and pass the inspection of the construction process by its inspectors. 1.0.1.0.2.0.3.0.4 ...3.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.0.4.1.
2..2 Pipeline components refer to the components used to connect or assemble pipelines: it includes pipes, pipe fittings, flanges, whole pieces, fasteners, foot gates, and expansion joints, friction joints, pressure-resistant water heaters, leak detectors and distributors, etc. 2.3 Pipeline components, including installation parts and resistant parts. 2.4. Safety parts refer to the components that transfer loads from pipes or pipes and accessories to supporting structures or equipment - it includes parts, brackets, inclined rods, balances, loose grids, support chains, guides, pins, saddles, plates, rivets, brackets, sliding brackets, etc.
2.0.5 Accessories refer to parts attached to the kidney by welding, screw connection or closing, such as hanging, other (branch) ears, induction rings, hanging benefits, solid plates and belt induction, etc. 2.0.6 Toxic media refer to substances that, if leaked into the environment, can cause serious and difficult-to-treat harm to humans if inhaled or contacted by humans even if treated promptly. 2.0.7 Toxic media refer to substances that, if leaked and inhaled or contacted by humans, can cause irreversible harm to humans if treated promptly.
2.0.8 Combustible substances refer to substances that can be ignited and continue to burn under normal production conditions. 2.0 The term for contaminants in equipment.
2.The equipment is mainly equipped with driving parts and moving parts. 2. Equipment is mainly equipped with stopping parts. 2.12 Inspection, inspection personnel refer to the quality control personnel who perform the quality inspection duties according to the construction documents. 2.0, 13 Inspection, inspection and inspection are the relevant quality inspection duties performed by the construction unit. The inspection personnel refer to the inspector or representative of the unit.
2.0-14: Normal steel: for design pressure P10MPa 2.U.13 High-pressure pipe fittings are used for pipe fittings with design pressure PMP. 2.0.16 Hot bending pipe fittings refer to the operation when the temperature is higher than the critical point of metal Ac. 2..1 Cold bending refers to the operation of cold bending, which requires some changes at low temperature. 2.0.18 Hot bending refers to the re-tightening operation to prevent the leakage of the connection of the bendable parts caused by thermal expansion at the working temperature.
2.0.19 Cold bending refers to the re-tightening operation to prevent the leakage of the connection of the bendable parts caused by cold bending at the working temperature:
2.0.100 Radiographic inspection refers to the circumferential radiographic inspection of all circumferential butt welds and the longitudinal radiographic inspection of the longitudinal welds in a batch of specified pipelines. 3 Radiographic inspection refers to the full circumferential wire inspection of a certain percentage of the circumferential welds in a batch of specified pipelines. It is only applicable to circumferential butt welds. 378
2.0.22 Pressure test refers to the test with filter or gas as the test medium, and the test pressure of the pipeline is tested to test the strength and tightness of the pipeline. The test with liquid is called pressure test. The test with gas is called air pressure test
2.23 Leakage test refers to the test with gas as the test medium, under the design pressure, to detect the leakage points in the pipeline system by using gas analyzer or other special means. 2.24 Reset refers to the restoration of the original state of the installed qualified pipe after disassembly. 2.025 Pressure test refers to the maintenance of the specified positive force by an air compressor or compressor within the specified time when the pressure test reaches the specified pressure. 2.126 Stop indicator When the pressure test reaches the specified pressure, cut off the gas source (or source) to check the slippage of the pipeline. 379
3 Acceptance of pipeline components and pipeline supports 3.1-General provisions
3.1. Pipeline components and pipeline supports must be inspected before installation. The product must have the manufacturer's quality certificate.
3.1-2 Before installing the components and pipeline documents, check their materials, specifications, and numbers according to the design documents, and conduct visual inspection. Those who do not meet the requirements shall not use them. 3.1.3 Before the installation of metal pipe components, the quality should be tested by optical analysis or other methods, and the low-temperature reputation and iron pipes should be marked with steel stamps. 3.14 During the construction process, the components and supports of the pipeline should be installed and tested for damage. The components and supports made of stainless steel and non-ferrous metals should not be stored with carbon steel during the storage period. 3.15 If the design documents require low-temperature impact tests, the low-temperature impact test should be carried out according to the provisions of the current national standard 4159 before the pipeline is installed. The indicators should not exceed the values specified in the design documents. 3.. If the quality certificate of the manufacturer does not contain the test results, the manufacturer should conduct supplementary tests according to the relevant provisions of the current national standard "Stainless Steel Etching Test Method G334.1--". 3.2 Steel Grade
3.2.! Steel pipes should be inspected and accepted in batches according to the current standards of the three manufacturers. Each batch of steel should be of the same specification and furnace number, and the heat treatment is not a case. 3.2.2 When making pipes, the quality certificate should indicate the name or certificate of the partner:
;
When shipping:
Same number:
Product standard number:
Quick number, pull number, delivery form, quantity (or number of properties) and number of pieces: breeding name, specification and quality grade:
The product standard specifies The inspection results (including static inspection measures) shall be printed by the technical supervision and sales department.
3.2.3 When the outer diameter of the pipe is greater than or equal to 36mm, it shall be marked: the marking sequence includes the steel grade, product specifications, product standard number and the supplier's mark or registration mark. The steel pipe shall be printed with the number and batch number after the steel grade: 380
For welding and galvanizing of low-pressure fluid pipes, it is not necessary to A mark is made on each copper tube. It should always be marked. When the outer diameter of the box tube is less than m1n, there should be a label to mark the small mark, the trademark, steel number, site number (except for the product standard where the furnace number is not specified for delivery), world number, contract number, product specification, product plate approval number, important certificate or technical education, manufacturing period and the stamp of the supplier's supervision department. 3.2.4 The steel plate roll shall comply with the provisions of Section 4.3 of this standard. 3.2.3 The quality of the material shall comply with the following provisions: 3.2-5.1 The adhesive layer at the bottom of the selected service shall be in accordance with the specified adhesive layer, and there shall be no cracks or cotton-like pores on the surface. When the adhesive layer is inspected by an electric point detector: it shall comply with the provisions of the current industry standard industrial equipment, pipe construction and acceptance standard H229. 3.2.5.2 The adhesive layer shall be inspected by the manufacturer. The surface of the plastic lining shall be smooth and uniform, with a uniform color, a solid structure, no bulging, delamination, uncured and unshaped fibers, etc. 3.25.3 The surface of the plastic lining shall be smooth and uniform, with no defects such as scratches or small holes. During the slurry extrusion process, there shall be no coke-related weld penetration phenomenon.
3.2.5.4 The surface of the pipe shall be smooth and uniform, with no defects such as shrinkage holes and misalignment. , effective holes, etc. 3.2.6 When the steel number and furnace number of the high-quality pipe are inconsistent with the steel number and furnace number of the parts, or there is no steel number and furnace number on the hook (or label), the supplier shall avoid the inspection and verification. 3.2-7.2 The following tests shall be carried out according to the following: one tensile test, one impact test, one flattening test or cold deformation test. The vertical test shall be carried out according to the provisions of the current national standard B223 (when the wall cannot be made, the sample may be tested according to the current national standard B2106: when the wall is less than 131rm, it can be exempted.
When the outer diameter is greater than m, the test should be carried out according to the current national standard B0 for high pressure furnace pipes.
When the outer diameter is less than 1 mm or equal to the current national standard for conveying liquids, the test should be carried out according to the standard width of 816.
3.2.7.3 The steel pipe or sample to be tested for the performance test should be selected by comparative analysis. 3.2.7.4 The chemical composition and mechanical properties of the same steel pipe should comply with the chemical composition and mechanical properties of the pipe fittings specified in Appendix A of this specification. 3.2.8 During the performance test of high pressure steel pipes, if there are any discrepancies, the test should be repeated with double the number of samples, and the re-inspection should only be carried out for the items that did not meet the original specifications. The re-inspected sample should be the closest section of the steel pipe hardness to the original unqualified item. If there is still one unqualified result after the re-inspection, the batch of pipes should be thoroughly inspected. The consultant shall not use it: 3.2-9 High-pressure steel will be tested in accordance with the following standards. 3.2.1 When the high-pressure steel is qualified by the factory, it should be thoroughly tested. 3.2.9.2 If there is a defect in the test certificate or the certificate is issued, it should be tested for 10% of the defects. If there is no unqualified, it should be tested one by one. 3R1
3.2. The outer surface of the high-pressure pipe should be tested according to the following methods. 3-2-10.1 The outer surface of the high-pressure steel pipe with a diameter of 12mm should be tested by the method of indirect testing. 3.2.10.2 Non-conductive high-pressure steel pipes shall be inspected by the egg-light method or the liquid penetration method. 3-2.11 For compacted pipes with a diameter greater than 12 nm that have been inspected by the methods of ultrasonic flaw detection, such as flaw detection, liquid penetration, etc., internal surface flaw detection shall be carried out according to the provisions of the current national standard for pipe ultrasonic flaw detection, B77? 3.2.12 The defects found by the high-pressure steel pipe shall be repaired step by step until they disappear. The actual thickness after the defects are removed shall not be less than the nominal thickness of the steel pipe, and shall not be less than the designed thickness. The actual thickness can be measured by a thickness gauge. 3.2.13 High-pressure steel pipes that have passed the inspection must be written into the "Verification Record" of the acceptance of commercial pressure steel pipes in accordance with the contents and format of the technical documents in Appendix 3 of this specification. Qualified high-pressure steel pipes must be arranged according to material and specifications: and sealed for supply to the factory, without protective tape, to prevent rust, 3.2.14 The parts of high-pressure copper pipe that do not meet the requirements after flaw detection must be removed and marked with limit marks and placed separately. 3.3 Cast iron pipes
3.3.1 The name or trademark of the family member or manufacturer must be marked. 3.3.2 Cast iron pipes should be inspected daily. 1% of each batch should be inspected daily to check its surface condition, paint quality and size.
The outer surface of the cast iron pipe should be clean and free of defects such as cracks, cold spots, thinning and dislocation. Other requirements should meet the following 3.3.3
provisions:
3.3.3.1 There should be no sand sticking and protrusions on the socket, and there should be no sand greater than 10mm and no lowering of the mouth.
3.3.3.2 There should be no depression at the root of the socket, and the local depression of other parts should be greater than 5% of the pad thickness. It must be 2mm. 3.3.3.3 The hole of the expanded cutting position shall not be greater than 1/thickness, and shall not exceed 5mm. 3.3.3.4 The depth of the intermittent groove and the local skin and scratch shall not exceed 1/thickness of the wall thickness plus 2mm. The depth of the annular skin scratch shall not exceed 5/thickness of the wall thickness plus 1mm. 3-3.4 The inner and outer surfaces of the iron pipe shall be smooth and smooth, and the steel pipe shall be firmly attached. 3.3.5 The K-inch thickness of the bearing casting shall comply with the requirements in Table 2.3.5. 382
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