JB/T 2549-1994 Aluminum air separation equipment manufacturing technical specifications
Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T 2549-94
Technical Specification for the Manufacturing of Aluminum Air Separation Equipment1994-07-18 Issued
Ministry of Machinery Industry of the People's Republic of China
1995-07-01 Yi Shi
Machinery Industry Standard of the People's Republic of China
Technical Specification for the Manufacturing of Aluminum Air Separation Equipment 1 Subject Content and Manufacturing Scope
JB/T2549-94
3549-79
This standard specifies the technical requirements for the manufacturing of aluminum sieve plate towers, coil heat exchangers, series heat exchangers, automatic box heat exchangers or other unit products, and the inspection items and test methods for aluminum air separation equipment in the products, and is suitable for the manufacture and acceptance of aluminum air separation equipment and similar equipment. 3 Standards
GB1384
Tolerances of shape and position Specifications for tolerances of unmarked oxygen ducts for air separation equipment
B/T 6895
Standards for welding technology for installation of aluminum air separation equipment B/T65S6
Surface coverage of air separation equipment
iB/z 1e?
3 Manufacturing technical requirements
3.1 Basic requirements
Aluminum air separation equipment direct reporting process specifications 3.1.1 The manufacture of air separation equipment shall comply with the provisions of this standard and the technical specifications shall be specified in the technical documents. 3.22 All parts of the air separation equipment shall be cleaned, decontaminated and grease removed, and the connection surfaces of the technical parts and the parts that may be modified during operation of the equipment shall be checked. The connection surfaces of the parts shall be checked and the welding shall not be carried out with gas. Electric gas shall not be used. According to the provisions of J/Z157:
3.1.4 The pressure vessels in aluminum air separation equipment shall meet the following basic requirements: 3.1.4.1. The materials used shall be the same. Including the materials used in the connection, the performance and specifications shall meet the relevant national standards and the requirements of the relevant standards. At the same time, the effective quality certificate shall be provided, and the test shall be repeated when necessary. 3.1.+2 Lead pressure vessels shall be limited to use in the following cases, and the design temperature shall not exceed 8m1 (with an external humidity of 26%-20%).
3.1.4.3 When the load exceeds 76, it is not advisable to use aluminum alloys with a casting content greater than or equal to 8 times. 3.1.4.4 The pressure-bearing components of pressure vessels shall meet the following requirements: Only materials permitted by foreign pressure vessel specifications shall be used. The materials used shall comply with the provisions of the corresponding specifications and have relevant certification requirements:
b, first use, and conduct relevant tests and verifications. Only if the technical requirements are met can the materials be manufactured. 3.1.4.5 The pressure vessel manufacturing and on-site welding units must hold a manufacturing license issued by the labor department. 3.1.4.6 The manufacturing and on-site welding units must strictly follow the specifications, standards and design drawings formulated by the state and relevant departments. Approved by the Ministry of Machinery Industry on August 1994
Implemented on July 1, 1995
JB/T2549-94
3.1.4.7 Welders engaged in the manufacture of aluminum pressure vessels must be trained, pass the examination, and have a welder certificate before they can weld on the job. The training and examination shall be in accordance with the provisions of Chapter 6 of JBT5: 3.1.4. The manufacture of shells and heads shall comply with the provisions of the Safety Technical Inspection Regulations for Pressure Vessels 3 (hereinafter referred to as the regulations). The process assessment of the pressure vessel shall comply with the provisions of JB/5895, 3.1.4.9 The post-treatment of aluminum overpressure perforators shall comply with the provisions of relevant international standards. 3.1.4.10 The repair of the welding chain of the pressure perforator shall comply with the relevant provisions of Article 9 of the regulations. The production of calcium pressure perforators must be carried out in a special site. Do not mix with black metal products. The workmanship must be carried out in a clean environment. Dust and flying objects must be controlled to prevent mechanical damage to the surface of the vessel: 3. 1. 4. 13
3. 1. 4. 14bZxz.net
3. 1.4.15
The welded surface should be machined and the surface should be hot-smoothed. Before welding, the core port and the tool must be cleaned and lubricated to ensure that the container is fully connected with the seat. When making the mutual force container in the aluminum air separation equipment, the manufacturer must provide the following technical information to the user: 1. Details:
Product quality certificate (hole penetration and format of the three parts): Safety quality inspection record of the pressure container: production and packaging,
3.1.4.16 After the upper and lower towers, coils, such as tubular heat-insulating testis and suction boilers, the inner cavity and the duct should be cleaned. Of course, the internal part must be dried, and the manholes, hands, kidney ports and interfaces must be sealed. Nitrogen pressure: The fixed pressure is 0. 01-n. MP: (low gauge pressure is G. 1 MP gauge pressure>, wind seal when the potential increase in the two parts of the treasure each installed as a gauge, to indicate the upper and lower points of force, 3.1.4.17 unless set! Another set of regulations have been produced on the outer surface of the flow of rust 3.1.4.18 aluminum pressure square climber other requirements must also be induced in the platform specification for non-ferrous metal jade power customer equipment. It should also meet the corresponding standards of the pressure narrow device
1.2.1 The sieve is the sieve plate in the tower (selling, buy Figure 1 of the Ai shovel learning parts, tree material research and selection of semi-regular clothing expansion 153:.1 Along the joint plate, the plate must be flat, there should be no violations, mouth depressions. Occupied, lines, scratches and rust and other defects. 3.2.2 The inner surface of the screen plate should be inspected by the group, and the ring (see 4.1) must be flat, and the whole material should be used: under special circumstances, the two general materials should be allowed, and the soft ring should be kept flat. When assembling, the gaps of the two rings should be staggered, 3.2.3 The screen pieces should be neat, and the height of the panel should not be greater than 9.5<square screen aperture), and after the hole is out, the surface of the orifice plate should still be smooth: no training example
JB/T 2549—94
3.2.4 The permissible error of the sieve hole diameter is ±0.05mm; no more than 20% of the sieve holes on each plate are allowed to exceed the permissible error, and the maximum permissible error is ±0.1 mm. The number of holes shall not exceed 1.3% of the total number, and the sieve holes shall be evenly distributed. The spacing deviation of the holes arranged in a triangular shape shall not exceed ±1% of the value specified in the drawing. The surface of the sieve itself must be smooth. 3.2.5 When assembling the tower plate, the gap between the opening of each tower plate and the sieve plate hole, between the tower plate and the upper and lower mesh rings, should not be larger than the diameter of the sieve hole; the upper and lower mesh rings should be evenly fitted with the inner and outer rings. 3.1.6 During assembly, the lift height 2 on each tower plate (see Figures 1 and 2) and the height of the outlet 2, the overflow outlet F, S, S, should be strictly controlled according to the requirements of the figure to ensure that the second outlet of the first layer is adjacent to the liquid (outlet without holes or above).
3.2.7 The tower must be flat during inspection. The flatness value C after the tower is installed (see Figures 3 and 4) should meet the following requirements: When 100am.m, the center (2/1000 and Cs1mm: when 16mm c/0c)
with guide bucket
around 2 three types of modified flow 4
Figure 3 The leveling of the ring speed tower plate according to C
JB/T2549-94
National 4 for the leveling of the gradual tower plate C
3.2.8 The tower plate is installed into the cylinder and kept horizontal. Its slope value Y relative to the leveling, that is, the vertical distance between the highest point and the lowest point (see Figures 5 and 6) should meet the following requirements Request,
When 100cmm (/10)
When D contains 100nmar.Appendix.Y(1/10)
Water level
Horizontal rain
National 5 bad tower plate installation information inclination deer
idle: for the tower plate installation after the screen hole this inclination for the multi-counterflow container, its micro-method mouth in the age plate net should be evenly distributed, each density flow relative position deviation should be shown! 3.29
Specification, | |tt||Table 1 Relative position of the flow outlet
3.2.11 The roundness difference of the outer shell of the tower on any side, that is, the difference between the maximum diameter and the minimum true diameter (see Figure 7), shall not exceed /1000 of its nominal diameter. JB/T2549-94
Figure? Simplified drawing
3.2.11 The straightness of the outer shell shall not exceed 1/1 of the tower height.And it should be controlled within the range of ±10Tnm. 3.2.12 The center line of the body should be perpendicular to the center plane of the profile, and the intervals between the phases should be parallel. The difference between the spacing between any two adjacent grooves should not exceed 0.5mm. After adjustment, the spacing deviation between the adjacent grooves of the upper and lower sections should meet the requirements of Table 2. Table 2 The deviation of the distance between the two lower axils and the holes in the tower. The tower can be equipped according to the actual size of the head. The same distance pads. The simple support inside the tower must be solid, and the joints between the inner and outer parts must be airtight, and the leakage is allowed. 3.2.14 3.7.15 During the installation and welding of the tower plate, the tower drum must not be damaged and the dirt must not be allowed to enter the tower. After each installation, the tower must be cleaned. 3.3 Tubular heat exchanger 3.3.1 The shape of the tower should be correct, the surface should be smooth, and there is no need for obvious protrusions. The external length deviation is: when the nominal diameter is 30m.=m 3.3.3 When the nominal diameter is 300m4m. 2. The connection between the bottle and the gas collector should be airtight, with the center line and the end face as the guide. The vertical tolerance is 0.021:1m, 3.3. The surface of the gasket should not be rough and should be smooth, with uniform thickness. 3.3.4 The coils used for winding should be annealed, which is generally not required. If splicing is not allowed to be blocked, at this time, the diameter should be equal to the inner diameter of the coil. 0.8 of the diameter should be used to determine whether it can pass through the tube. 3.3.5 The raw material tubes before winding and the products after each layer of coils and assembly should be subjected to water pressure test according to Table 3, and they should not be full. If a single tube is found in the middle, it should be replaced. 3.3 .6 During the coiling process, no defects such as pipe compression and scratches are allowed. 3.3.7 Use welding to fix the pipe on the gasket. The arrangement of each layer of gasket strips should be even. 3.3.8 The outermost gasket strip should be close to the pipe screen without any gap. The contact between the pipe and the pipe should be sealed and connected according to the specific requirements of the design.
During coiling, the axial and radial spacing of the pipe should be uniform. The winding height can be increased or decreased by one figure. 3.3.10 When the pipe is combined with the plate, the inner diameter of the pipe that is reduced due to welding shrinkage should not be less than the original inner diameter. 0.85 of the inner diameter, and the reduction of the inner diameter should not exceed 10% of the total number. 3.3.11 No plugged windings are allowed. However, when individual windings are found to be defective and cannot be restored after water testing after assembly, 5
JB/T2549-94
The inlet and outlet of the defective windings are allowed to be blocked under the conditions that the design drawings permit and confirm that it does not affect the performance of the product. However, the number of blocked windings and their locations should be stated in the product quality certificate. 3.4 Shell and tube heat exchangers
3.4.1 Forming (cutting) of windings Before assembly, it shall be subjected to a water pressure test. It is not allowed to exceed 3.4. The pressure holding time of the water pressure test shall be determined according to the design drawings. 3.42 Before replacement, the oxidation on the tube sheet shall be removed; all parts shall be stripped and vented. 3.4.3 During assembly, it shall be ensured that the belt is perpendicular to the tube sheet, and the upper and lower tube sheets are half-aligned. The shape and position tolerances shall meet the requirements of the design drawings and technical documents. 3.4.4 No sand and pores are allowed in the weld. 3.4.5 For shell-and-tube heat exchangers using the connection method, the quality control shall be carried out and the membrane between the tube and the hole shall meet the requirements of the design drawings. 3.5 Automatic unpacking 3.5.1 When manufacturing the upper and lower plates, the shape, size and precision of the plate and the "V"-shaped plate shall meet the requirements of the design drawings. The shape of the packing should be regular, without deformation and radial distortion. The axial tolerance of the inner hole should at least meet the requirements of 10 degrees in GB1184.
3.5.2 For the \0\-shaped seal made of pure aluminum, the press-to-replace weld key should be trimmed until the surface of the reversing surface is consistent with the parent aluminum wire. The surface should be smooth and smooth. The forming process of the seal should be arranged after annealing. 3.5.3 Unless otherwise specified in the design, the weld chain flaw detection and auxiliary pressure test shall be carried out according to the provisions of Chapter 4. 3.6 Adsorbers
3.6.1 The flatness tolerance of the high collar flange joint surface of the assembled adsorber shall not be lower than the requirements of 10 degrees in GB1184. 3.6.2 The filter should not be connected. If it needs to be connected, the welding should not use free flux. After the filter screen is installed, it should be placed on the hole particles without leaving gaps and no looseness. 3.3 Each support (or base) should be connected to the cylinder by continuous welding. Intermittent welding is not allowed to prevent bypass. 3.6.4 The welding between the cylinder and the header, the front body and the pipe and the butt joint must be frequent. Unless otherwise specified in the design, the strength test of the product shall be carried out in accordance with the provisions of Section 1. 3. Internal channel of the cold box || tt || 3. The materials, properties and specifications of the calcium joints must meet the requirements of 1. 3.72 The external circumference tolerance of the pipe mouth, the vertical tolerance of the bearing surface to the axis, and the mechanical damage of the surface (such as scratches, pits, etc.) shall comply with the relevant provisions. 7.3 The welding of the lead-aluminum joint and the body shall be free of cracks, pores, deterioration and defects due to heat influence.
3.7.4 Aluminum welding must be clean of burrs and oil. 3.7.5 The technical requirements for oxygen pipelines shall comply with the provisions of B2 and the inspection method for the residual volume of oxygen pipelines. 3.6 The length ratio of welded parts (including filter effect, etc.) for non-oxygen transmission (including filter effect, etc.) to be inspected by X-ray and welded joints shall comply with the provisions of Table 4. The inspection result shall not be lower than the requirements of the grade A standard specified in JB/16695. For the ring welded parts that do not need to be tested by air pressure and then inspected by X-ray, the length ratio of welded joints shall comply with the provisions of the standard. 3.7 The joints shall be subjected to pressure resistance test and airtightness test. Unless otherwise specified by the design, the requirements of the above two types of tests shall comply with the provisions of Table 5.
3. In order to prevent the deformation, cracking and breaking of the pipeline caused by large temperature difference, excessive deadweight and welding stress, in addition to taking effective temperature compensation measures for the pipeline joint, it is necessary to design "U-shaped pipelines" or use expansion joints. In addition, attention should be paid to the coordination of position, size and angle before installation to minimize the pre-stress caused by improper installation. 6
4 Inspection items and test methods
4.1 Inspection of the surface quality of the welding chain
JB/T 154994
The pressure vessels in aluminum air separation equipment shall be inspected and tested. 4.1.1 There shall be no defects such as unevenness, pores, arc pits and slag. The weld metal and the fly ash on the welding chain shall be clear. 4.1.2 The welding shoe shall be smooth with the parent material.
4.1.3 The size of the welding leg of the angle welding chain shall comply with the relevant standards of the design country. The shape of the chain shall be smooth. 4.1.4 The undercut of the short surface shall comply with the provisions of the relevant standards. 4.2 Root joint test pattern inspection
The pressure vessels in the manufacturing equipment shall be tested for the strength of the welding test pattern. The size, size, loading method, test items and qualified standards of the welding style shall comply with the design drawings and relevant international standards. 3 X-ray flaw inspection of welds
The weld chain of the pressure transmitter in the air separation equipment must be carefully inspected by X-ray. The length ratio of the flaw inspection shall be related to the pressure test specified by the design country and the design pressure transmitter type. Unless otherwise specified by the design country, the flaw inspection length ratio of the weld of the equipment shall comply with the provisions of Table 3. The flaw inspection level assessment sequence shall be carried out in accordance with Appendix A of JB 6895. Unless otherwise specified in the design number, the flaw inspection result shall not be lower than the requirements of Class 1 film specified in the company's JB/T record A. Table 3 Container vehicle certificate X-line inspection length ratio to
Design violation
Design water type
Gas test comparison
Water jade peptide test
c.1~.1. 6
Environmental protection length ratio control head
If the welding is found to be trapped in the operated position, it should be supplemented by the bureau. If the length is less than 13 of the total loan, if it still does not meet the customer's requirements, the weld should be fully inspected. For the angle joints and workpieces that require flaw detection, the first defect of retrograde X-ray flaw detection or acoustic flaw detection should be carried out. The manufacturing and evaluation of the surface flaw detection should be carried out in accordance with the provisions of the standard seat. The length ratio of the aluminum joints of the conveying gas carrier should comply with the provisions of Table 4. Shell 4 non-shooing system pipeline continuous X-ray flaw ratio ratio is reduced according to the type of non-steam test equipment Yongle test 4.4.1 Test size selection order c. 1~1. 6 u. 25~1. 5 0. 1~U.25
Deep pressure test
Aluminum air separation equipment must be subjected to pressure test. Its test pressure and maintenance time are related to the design pressure and design separation, as well as the test items selected in the design drawings. Unless otherwise specified in the design, the test pressure and maintenance time can be determined in accordance with Table 3.
Pressure test category
Pressure test
Air tightness test
Design selected
Test items
Water-tight film
Thickness test
Gas tightness test
JB/T 2549-94
Pressure test of pressure vessels in Table 5
u. 1 -1. G
(L Grade
test pressure
medical insurance can
for Jun Ji Hu Hui (the whole temperature reaches no more than the heart of the Leli, etc., the pressure test should be determined by recalculating the formula listed in Article 3 of the Liao Regulation,
the Lezhi test of the condensing device can be carried out on it with the upper tower and the lower tower. The technical requirements of the pressure test should also meet the non-ferrous gold account pressure resistance of the corresponding standard: the industry party test parameters of the coil type heat exchanger should meet The requirements of Table 6 shall apply. 5. Pressure test of coil heat exchanger Pressure test type Gas discharge test Design of test items Gas pressure test Including performance test Summary: The designed pressure shall not exceed oM\a, 4.4.7 General requirements for water test 1. ht p.1 0. 1t
1. 25 pI 0. t
1.60 ,Ⅱ aa. c5
After the test, the weld of the device must be inspected and tested by the third party. The test must be complete. The test must be completed. The test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: the test results are as follows: Rise the specified formula and adjust the original plate: test the jade formula and the maintenance time see the table to add the rational consultation. Slowly reduce the pressure to the design pressure value, and then maintain the ni = back through the specification inspection interval, the user can continue to use the plan ten ways to maintain, the package inspection fragrance, no abnormal sound, just the sample test platform specification. After the test, the second type is not allowed to select the voltage transformer, the control will be tightened, the method is completed, the month is dry, the store will shrink the space, and the customer will be able to accept the new medical service.
4，4.? The general requirement of the test is: the abnormal structure will not be changed until the device is full of the original structure. The equipment and running parts are fully tested and left in the required space. The design drawings of the equipment are required to adopt gas mutual testing and marketing inspection. The cabinet must be approved by the safety department of the manufacturing unit and the person in charge. During the test, the safety department of the industry will conduct on-site inspection! The gas used in the test should be clean air and more. The air pressure test is divided into two pressure holding stages. The pressure value and corresponding pressure holding time of each stage are shown in Figure 8. In which pressure holding stage, especially the corresponding pressure holding time of the test pressure, the pressure value and the pressure holding time of the test pressure can be set as the pressure value before the pressure holding stage. The whole test should be performed carefully, including all auxiliary parts and all connection parts. Check whether the space is full of gas and whether the product has abnormal deformation. During the test, if there is no pressure drop or leakage, the test should be carried out slowly. If there is no leakage, especially abnormal conditions, the pressure can be further increased. When the insulation layer is checked, the specified pressure should be maintained, but it is not the same as the method of using a pressure regulator to maintain the pressure unchanged. The pressure should not be controlled in a state of pressure regulation. During the test, if the pressure of the standard part is about to change, the air flow is not visible, and no abnormal conditions are seen, the pressure test of the equipment is qualified. A (MPa)
4.4.4 Requirements for gas tightness test
JB/T 2549-94
6 Pressure test pressure-inch test
1 Design test
If the aluminum pressure vessel passes the pressure test and passes it, its air tightness test can be exempted. However, if the air tightness of the connection is tested, it must be carried out. The gas tightness test should be carried out in a special arrangement. The gas used in the gas tightness test should be the same as that in the gas test. During the test, the pressure should be raised to the test pressure of the value. The size should comply with the provisions of Table 5. When the value is reached, other inspections should be carried out at the seams and joints to check if there is no stagnation and abnormality. If there is no leakage and the pressure gauge does not change, the air tightness test is considered to be qualified. Small-sized penetrators can be immersed in water for testing: 4.E Other hazardous test items
4.5.. The test method for the oil content on the surface of lead-acid air separation equipment parts shall be in accordance with the provisions of B/16895 4.5.2 The gas resistance test of the feed-type exchanger shall be carried out in accordance with the technical specifications of B/16895. Its test method shall comply with the relevant standards. 4.5.3 Regarding the test of the welded joints of the parent material of the H-type welded device, the design sample and relevant standards shall be followed. Additional explanation,
This standard was proposed by the Suzhou Ammonia Machine Research Institute of the Ministry of Machinery Industry and was drafted by the Hangzhou Oxygen Machine Research Institute. The main drafter of this international standard is Xu Langxing:? The general requirement of the test is to ensure that the structure of the equipment is not changed. The equipment and the running parts are fully tested and left in the required range. The design drawings of the equipment are required to adopt gas mutual testing and marketing inspection. The cabinet must be approved by the safety department of the manufacturing unit and the person in charge. During the test, the safety department of the industry will conduct on-site inspection! The gas used in the test should be clean air and more. The air pressure test is divided into two pressure holding stages. The pressure value and corresponding pressure holding time of each stage are shown in Figure 8. In which pressure holding stage, especially the corresponding pressure holding time of the test pressure, the whole test should be performed carefully, including all auxiliary parts and all connection parts, to check whether the space is full of gas and whether the product has abnormal deformation. During the test, if there is no pressure drop or leakage, the test should be carried out slowly. If there is no leakage, especially abnormal conditions, the pressure can be further increased. When the insulation layer is checked, the specified pressure should be maintained, but it is not the same as the method of using a pressure regulator to maintain the pressure unchanged. The pressure should not be controlled in a state of pressure regulation. During the test, if the pressure of the standard part is about to change, the air flow is not visible, and no abnormal conditions are seen, the pressure test of the equipment is qualified. A (MPa)
4.4.4 Requirements for gas tightness test
JB/T 2549-94
6 Pressure test pressure-inch test
1 Design test
If the aluminum pressure vessel passes the pressure test and passes it, its air tightness test can be exempted. However, if the air tightness of the connection is tested, it must be carried out. The gas tightness test should be carried out in a special arrangement. The gas used in the gas tightness test should be the same as that in the gas test. During the test, the pressure should be raised to the test pressure of the value. The size should comply with the provisions of Table 5. When the value is reached, other inspections should be carried out at the seams and joints to check if there is no stagnation and abnormality. If there is no leakage and the pressure gauge does not change, the air tightness test is considered to be qualified. Small-sized penetrators can be immersed in water for testing: 4.E Other hazardous test items
4.5.. The test method for the oil content on the surface of lead-acid air separation equipment parts shall be in accordance with the provisions of B/16895 4.5.2 The gas resistance test of the feed-type exchanger shall be carried out in accordance with the technical specifications of B/16895. Its test method shall comply with the relevant standards. 4.5.3 Regarding the test of the welded joints of the parent material of the H-type welded device, the design sample and relevant standards shall be followed. Additional explanation,
This standard was proposed by the Suzhou Ammonia Machine Research Institute of the Ministry of Machinery Industry and was drafted by the Hangzhou Oxygen Machine Research Institute. The main drafter of this international standard is Xu Langxing:? The general requirement of the test is to ensure that the structure of the equipment is not changed. The equipment and the running parts are fully tested and left in the required range. The design drawings of the equipment are required to adopt gas mutual testing and marketing inspection. The cabinet must be approved by the safety department of the manufacturing unit and the person in charge. During the test, the safety department of the industry will conduct on-site inspection! The gas used in the test should be clean air and more. The air pressure test is divided into two pressure holding stages. The pressure value and corresponding pressure holding time of each stage are shown in Figure 8. In which pressure holding stage, especially the corresponding pressure holding time of the test pressure, the whole test should be performed carefully, including all auxiliary parts and all connection parts, to check whether the space is full of gas and whether the product has abnormal deformation. During the test, if there is no pressure drop or leakage, the test should be carried out slowly. If there is no leakage, especially abnormal conditions, the pressure can be further increased. When the insulation layer is checked, the specified pressure should be maintained, but it is not the same as the method of using a pressure regulator to maintain the pressure unchanged. The pressure should not be controlled in a state of pressure regulation. During the test, if the pressure of the standard part is about to change, the air flow is not visible, and no abnormal conditions are seen, the pressure test of the equipment is qualified. A (MPa)
4.4.4 Requirements for gas tightness test
JB/T 2549-94
6 Pressure test pressure-inch test
1 Design test
If the aluminum pressure vessel passes the pressure test and passes it, its air tightness test can be exempted. However, if the air tightness of the connection is tested, it must be carried out. The gas tightness test should be carried out in a special arrangement. The gas used in the gas tightness test should be the same as that in the gas test. During the test, the pressure should be raised to the test pressure of the value. The size should comply with the provisions of Table 5. When the value is reached, other inspections should be carried out at the seams and joints to check if there is no stagnation and abnormality. If there is no leakage and the pressure gauge does not change, the air tightness test is considered to be qualified. Small-sized penetrators can be immersed in water for testing: 4.E Other hazardous test items
4.5.. The test method for the oil content on the surface of lead-acid air separation equipment parts shall be in accordance with the provisions of B/16895 4.5.2 The gas resistance test of the feed-type exchanger shall be carried out in accordance with the technical specifications of B/16895. Its test method shall comply with the relevant standards. 4.5.3 Regarding the test of the welded joints of the parent material of the H-type welded device, the design sample and relevant standards shall be followed. Additional explanation,
This standard was proposed by the Suzhou Ammonia Machine Research Institute of the Ministry of Machinery Industry and was drafted by the Hangzhou Oxygen Machine Research Institute. The main drafter of this international standard is Xu Langxing:
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