JB/T 1035-2002 Technical specification for manufacturing copper air separation equipment
Some standard content:
ICS 71.100.20
Machinery Industry Standard of the People's Republic of China JB/T 1035—2002
Replaces JB/T1035--1994
Specifications for manufacturing copper-made air separation plants2002-12-27Promulgated
Implementation on 2003-04-01
Promulgated by the State Economic and Trade Commission of the People's Republic of ChinaForeword
Normative references
Welding and brazing
Inspection and acceptance
Product welding test plate
Non-destructive testing
Pressure resistance test and air tightness test
Air resistance test
11 Nameplate and product quality documents,
Appendix A (Normative Appendix (List) Examination rules for copper welders Appendix B (Normative Appendix) Examination rules for copper brazing workers. Contents
Appendix C (Normative Appendix) Rules for qualification of welding procedures for copper and copper alloys. Appendix D (Normative Appendix) Rules for qualification of brazing procedures for copper and copper alloys Appendix E (Normative Appendix) Preparation and testing of product welding test plates+JB/T1035--2002
This standard is a revision of JB/T1035--1994 "Technical Specifications for Manufacturing of Copper Air Separation Equipment". Compared with JB/T1035-1994, this standard has the following major changes: JB/T1035-2002
The provisions of manufacturing tolerances such as edge angle, misalignment, roundness, straightness, etc. are unified with the relevant provisions of GB150--1998 "Steel Pressure Vessels"
The proportion of non-destructive testing of copper vessels is unified with GB150 and "Regulations on Safety Technical Supervision of Pressure Vessels". The original standard A and B type welds 100% radiography should comply with the provisions of JB/T7260-1994 "Radiography and Quality Classification of Copper Welds of Air Separation Equipment" Class I. Considering the process level and necessity, they are all changed to Class I without affecting product quality. In view of the fact that there is no professional standard for copper containers to provide for welder examinations, brazing examinations, copper and copper alloy welding process assessments, copper and copper alloy brazing process assessments, and inspection and test requirements for copper container product welding test plates, this standard adds Appendix A, Appendix B, Appendix C, Appendix D and Appendix E to address the above situation. This standard replaces B/T1035-1994.
Appendix A, Appendix B, Appendix C, Appendix D and Appendix E of this standard are all normative appendices. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the Mechanical Industry Gas Separation and Liquefaction Equipment Standardization Technical Committee. The drafting unit of this standard: Hangzhou Oxygen Generator Group Co., Ltd. The main drafter of this standard: Xu Zhifeng.
The previous versions of the standards replaced by this standard are: JB1035-1967, JB1035-1979, and JB/T1035-1994. II
Technical Specification for Manufacturing of Copper Air Separation Equipment JB/T 1035--2002
This standard specifies the manufacturing and inspection requirements for sieve plate distillation towers, straight tube condenser evaporators, coil heat exchangers and similar copper and copper alloy equipment made of copper or copper alloy materials in air separation equipment (hereinafter referred to as "air separation equipment"). This standard applies to containers and equipment made of copper or copper alloy materials in air separation equipment. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all referenced documents with a white date, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions shall apply to this standard. GB/T228—1987 Metal tensile test method GB/T232—1999 Metal material bending test method (eqvISO7438:1985) GB/T13306—1991 Label
JB4708—2000·Welding procedure assessment for steel pressure vessels JB.4730-1994 Nondestructive testing of pressure vessels JB/T6896—1993 Surface cleanliness of air separation equipment JB/T7260-1994 Radiography and quality classification of copper welds in air separation equipment Pressure vessel safety Technical Supervision Regulations
3 General
3.1 Pressure vessels in air separation equipment that meet the following conditions at the same time are subject to the supervision scope of the "Regulations on Safety Technical Supervision of Pressure Vessels" (hereinafter referred to as "Vessel Regulations"):
a) The maximum working pressure pw is greater than or equal to 0.1MPa (excluding liquid static pressure): the inner diameter (non-circular cross-section refers to its maximum dimension) is greater than or equal to 0.15m, and the volume V is greater than 0.025m2; b)
The medium contained is gas, liquefied gas or liquid with a maximum working temperature greater than or equal to the standard boiling point. c)
3.2 The unit that manufactures copper pressure vessels shall hold a manufacturing license of the corresponding level. 3.3 The manufacture of pressure vessels shall be subject to the supervision of quality and technical supervision agencies. In addition to complying with this standard, the manufacture of copper air separation equipment shall also comply with the provisions of the drawings and relevant standards. 3.4
4 Materials
The materials used to manufacture pressure vessels shall be accompanied by a material quality certificate and comply with the provisions of the relevant standards. 4.1
The material quality certificate shall be issued by the material manufacturing unit (original) or a valid copy with the official seal of the material supply unit and the seal of the person in charge. 4.2
4.3The material identification (including: brand, specification, furnace, batch number, production unit seal, etc.) shall be complete and consistent with the material quality certificate. 4.4The material used for pressure components shall be re-tested in case of any of the following situations: a) The material quality certificate does not provide the measured chemical composition and mechanical properties; b) The material quality certificate states "the copy is invalid" or "the copy is not equivalent"; c) The user requires re-testing:
d) The design drawing requires re-testing:
e) When the manufacturing unit has doubts about the material or material quality certificate; JB/T 1035--2002
f) The content of the material quality certificate is incomplete. 4.5 The manufacturing unit shall have a special place for storing copper and copper alloy materials that is rainproof, corrosion-proof and moisture-proof. 4.6 When the material is used for the main pressure components, the material identification shall be transplanted during the manufacturing process, and the transplantation shall be carried out by writing, engraving or recording. 4.7 The welding material shall have a quality certificate from the manufacturer and comply with the relevant standards. The outer packaging identification shall be consistent with the quality certificate. 5 Welding and brazing
5.1 Welders:
Welders who are responsible for welding between pressure components of copper pressure vessels and between pressure components and non-pressure components must undergo basic theoretical training and practical operation skills training, pass the basic theoretical and practical operation skills examinations and obtain the corresponding project certificate. The welder examination rules are shown in Appendix A of this standard:
5.2 Brazers:
Brazers who are responsible for brazing between pressure components of copper pressure vessels shall undergo practical operation skills examinations and obtain the corresponding project certificate. The brazer examination rules are shown in Appendix B of this standard. 5.3 Welding method:
Welding of copper and copper alloys shall be carried out by arc welding, submerged arc welding, tungsten or metal arc gas shielded welding (oxy-acetylene welding is only applicable to brass) and other qualified welding methods. 5.4 Classification of welding joints of copper pressure vessels: The welding joints of the main pressure-bearing parts of the vessel are divided into four categories: A, B, C, and D, as shown in Figure 1. ?
5.5 The welding process of the following types of welding joints shall be evaluated in accordance with the provisions of Appendix C of this standard before welding the product: a) Welding joints of pressure components:
b) Welding joints welded to pressure components; c) Positioning welding joints melted into permanent welds; d) Overlay welding and repair welding on the surface of the parent material of pressure components; e) Repair welding joints of the above welding joints. 5.6 When brazing is used for the connection between cylinder sections and between cylinder sections and heads of copper pressure vessels, the brazing process shall be evaluated in accordance with Appendix D of this standard.
For the pressure welded joints (or brazed joints) of copper pressure vessels, welding procedure specifications and brazing procedure specifications should be prepared. 5.74
6 Inspection and acceptance
6.1 Head:
JB/T1035—2002
In principle, the head is not spliced, but formed by integral pressing. The thickness of the head after forming should not be less than its nominal thickness minus the negative deviation of the plate. Head shape deviation: After the head is formed, the shape deviation should be checked with an inner sample with a chord length of not less than 3/4D: (D; is the inner diameter of the head), and the maximum gap should not be greater than 1.25%Dic
The longitudinal wrinkle depth of the straight edge of the head should not be greater than 1.5mm. 6.2 Misalignment of welded joints:
The misalignment b of A and B welded joints (see Figure 2) shall comply with the provisions of Table 1. a
A welded joint
Material thickness at the joint
>12～20
Table. 1
B welded joint
Unit: mm
Misalignment b according to welded joint categoryA welded joint
Note: When materials of unequal thickness are butt-jointed, the difference in thickness shall not be counted in the misalignment. 6.3 Welding joint edge angle:
Class B welding joint
≤1/48
≤148
The edge angle E formed in the circumferential direction of the welding joint shall be checked with an inner or outer sample with a chord length L equal to 1/6D; (D; is the inner diameter of the cylinder section) and not less than 300mm (see Figure 3). The E value shall not be greater than (3/10+2)mm and not greater than 5mm. The edge angle E formed in the axial direction of the welding joint (see Figure 4) shall be checked with a ruler with a length of not less than 300mm. The E value shall not be greater than (8/10+2)mm and not greater than 5mm.
JB/T1035—2002
6.4 Roundness of cylinder section:
After the assembly of the container under internal pressure is completed, the roundness of the cylinder section should be checked: a) The difference e between the maximum inner diameter and the minimum inner diameter of the same section of the cylinder section should not be greater than 1% of the inner diameter D; of the section, and should not be greater than 25mm; when the section under inspection is located within the range of one times the inner diameter of the opening center, the difference e between the maximum inner diameter and the minimum inner diameter of the section should not be greater than the sum of 1% of the inner diameter D; of the section and 2% of the inner diameter of the opening, and the ear should not be greater than 25mm. 6.5 Straightness of container shell:
Unless otherwise specified in the drawing, the allowable straightness error of the shell should not be greater than 1% of the shell length. 6.6 Length of cylinder section and weld spacing:
The minimum length of a single cylinder section should not be less than 200mm. During assembly, the outer arc length between the longitudinal welds of adjacent cylinder sections and the outer arc length between the joint seam of the head and the longitudinal welds of the adjacent shell sections shall be greater than 3 times the material thickness and not less than 100mm. 6.7 The shape, size and appearance requirements of the surface of the welded joint: a) The excess height e of A and B type welded joints shall not be greater than 3mm, and the excess height formed after the back of the weld is fully welded during single-sided welding shall also not be greater than 3mm: b) The weld leg height of C and D type welded joints shall be the thickness of the thinner weldment: c) There shall be no cracks, pores, incomplete penetration, incomplete fusion, arc pits and slag on the surface of the welded joint. The weld shall smoothly transition to the parent material: d) Copper containers with a welded joint coefficient of 1 shall not have undercuts. The depth of undercuts of other containers shall not be greater than 0.5mm. The continuous length of undercuts shall not be greater than 100mm. The total length of undercuts on both sides shall not exceed 10% of the length of the weld. 6.8 The welder (or brazer) stamp shall be stamped on the specified part of the container. When the thickness of the copper material is less than or equal to 3mm, the welder (or brazer) stamp number can be recorded or engraved. 6.9 Welding repair:
The number of repairs on the same part of the weld should generally not exceed two times. Repairs exceeding two times should be approved by the technical person in charge of the manufacturing unit. A repair process should be compiled for the repair. The repair part, number of times, welder and welding materials used for repair should be recorded in the product quality record. 6.10 When butt welding copper parts of unequal thickness, if the difference in thickness between the two plates exceeds 3mm, thinning shall be performed as shown in Figure 5. Li+ L≥3 (82 -8)
6.11 Flange surface and flange screw hole position:
The flange surface should be perpendicular to the pipe, pipe axis or the main axis center line of the container cylinder. The horizontal or vertical deviation of the flange surface shall not exceed 1% of the flange outer diameter. When the flange outer diameter is less than 100mm, it shall be calculated as 100mm and shall not exceed 3mm. The bolt holes of the flange should be arranged in the middle of the main axis of the shell or the plumb line (see Figure 6). Special requirements should be indicated on the drawing. 6.12 The brazed joint should ensure sufficient lap length, and the joint gap should meet the requirements of the process regulations. 6.13 Appearance requirements of brazed joints: bzxZ.net
The brazed joint should be full, and there should be no unbrazed parts or brazing material dripping in the parts visible to the naked eye. The brazing flux and residual slag should be removed after brazing.
JB/T 1035--2002
6.14 The flanges or flanges on the shell and the head should not have cracks, cracks, and uneven defects. 6.15 Copper pressure vessels should avoid opening holes in the weld and its edges. The edge of the hole should be no less than 100mm away from the weld fusion line. However, when the thickness of the cylinder section or head is not more than 5mm, it is allowed to be greater than or equal to 50mm. When it is unavoidable, it is allowed to make holes on the weld, but it must meet the following requirements:
a) The center distance between two adjacent holes on the same weld shall not be less than twice the diameter of the larger hole; b) When the hole is processed into a flange, the distance between the weld and the center of the flange shall not be greater than 1/5 of the diameter of the flange body; c) The weld within a range of not less than 1.5 times the diameter of the hole on both sides of the hole center must be 100% radiographed. 6.16 All parts must be strictly degreased, and the grease residue on the surface of the parts in contact with the oxygen medium shall not exceed 125mg/m2. The test method shall be in accordance with the provisions of JB/T6896-1993.
6.17 Sieve plate distillation tower:
6.17.1 The sieve holes of the tower plate must be smooth, and the surface of the tower plate should be free of obvious burrs. The burrs should face downward during installation. 6.17.2 The tolerance of the diameter of the formed sieve holes on the tower plate is ±0.05mm: the number of sieve holes exceeding the tolerance on the whole tower plate should not exceed 5% of the total number of holes on the tower plate: the number of missed punching holes should not exceed 0.3% of the sieve holes on the tower plate; the tolerance of the spacing of the sieve holes arranged in a triangle is ±10% of the hole spacing specified in the drawing. 6.17.3 When assembling the tower plate, the overflow port of each tower plate should be tightly fitted around the tower plate, between the tower plate and the upper and lower rings, between the tower plate and the center cover, and between the upper and lower rings and the outer cylinder. The height of the overflow baffle of each tower plate and the overflow channels S, S1, and S2 should be strictly controlled according to the requirements of the drawings during assembly, and the overflow port of the upper layer should be correctly located above the liquid receiving trough (without perforated plate) of the lower layer, as shown in Figure 7. Figure 7
6.17.4 The rolling groove of the cylinder should be perpendicular to the center line of the cylinder, and any two adjacent rolling grooves should be parallel, and the tolerance of their spacing should not be greater than ±0.5mm. During assembly, the allowable difference between the two adjacent grooves of the upper and lower sections of the cylinder shall not be greater than ±1mm. 6.17.5 The tower plate must be flat, and the flatness C (see Figure 8) of the tower plate after assembly shall not be greater than 1mm. 6.17.6 The tower plate should remain horizontal after assembly, and the horizontality Y (see Figure 9) shall not be greater than 1mm. 6.17.7 The upper end flange surface of the lower distillation tower or the supporting surface of the connecting inner cylinder shall be perpendicular to the center of the cylinder, and the verticality in the diameter direction shall not be greater than 1/1000 of the distance between the flange surface or the supporting surface and the bottom plane. 6.17.8 The verticality of the tower body after assembly shall not be greater than 1/1000. 5
JB/T 1035--2002
6.18 Condenser evaporator:
6.18.1 The tube length deviation of the tube array shall not be greater than ±2mm. Figure
6.18.2 The upper and lower tube sheets should be parallel, and the holes should be aligned. After the tubes are installed, the tubes should be perpendicular to the tube sheets. 6.18.3 The tinning or tinning brazing of the tube sheets and the tubes inserted into the tube sheets should be uniform, and the soldering should not block the tube holes. 6.18.4 The tubes should be checked one by one. When the tubes are leaking or blocked and it is inconvenient to remove them, welding (or brazing) is allowed to block the tube holes. The blocked tube holes shall not exceed 0.5% of the total number of tubes. 6.19 Coil heat exchanger:
The tube sheets and the tubes inserted into the tube sheets should be tinned at both ends, and the tin layer should be evenly connected. The soldering should not block the tube holes. 6.19.1*
The tube sheets and gas collectors should be airtight, and the center line of the tubes should be perpendicular to the end face of the tube sheets. 6.19.2
The surface of the gasket strip should be smooth and flat, and the thickness should be evenly connected. 6.19.3
Tubes for coiling should be annealed and joints should be avoided. Reliable welding (or brazing) technology should be used for joints, and strength and airtightness should be guaranteed.
6.19.4
6.19.5 Before coiling, pipes should be subjected to water pressure test one by one according to process regulations. There should be no leakage. After each layer of coiling, pipes should be subjected to water pressure test. There should be no leakage. Welding is allowed for leakage at joints. There should be no defects such as flattening, stretching, and notching during coiling. Polygons should not be present along the coiling direction. 6.19.6
When coiling, the axial and radial clearances should be uniform. The number of coiling turns within the coiling length is allowed to increase or decrease by one turn. 6.19.73
6.19.8 If the coil is found to be blocked, leaking or other defects and cannot be repaired (repaired), welding (or brazing) is allowed to be used to block the pipe opening, but the manufacturer must ensure the heat exchange effect and performance of the heat exchanger. 7 Product welding test plate
7.1 All copper pressure vessels within the scope of the "Container Regulations" should be made into product welding test plates per unit. Whether other containers need to have product welding test plates shall be specified in the drawings.
7.2 The material used for the test plate must be of the same brand, specification and heat treatment status as the material used for the container body. 7.3 The test plate must be welded together with the longitudinal weld of the cylinder at the extension of the longitudinal weld of the cylinder, following the same welding process as the longitudinal weld of the cylinder. 7.4 The test plate shall be welded by the welder who welds the longitudinal weld of the container. 7.5 The inspection and test requirements of the test plate are shown in Appendix E of this standard. 7.6 The batch-to-unit welding test plate of the product shall comply with the relevant provisions of Article 77 of the "Container Regulations".
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