This standard specifies the design, manufacture, inspection, acceptance, storage, installation, basic parameters and dimensions of metal bellows expansion joints. GB 16749-1997 Pressure Vessel Corrugated Expansion Joints GB16749-1997 Standard download decompression password: www.bzxz.net

GB16749-1997
This standard is a revision of Appendix E\U-shaped expansion joints" in GB150-89 Steel Pressure Vessels and JB1121-83&Corrugated expansion joints, and merges the design, manufacturing inspection and other contents of the above two standards. After modification and supplementation, it forms a complete comprehensive product standard for pressure vessel corrugated expansion joints.
This standard is formulated with reference to the Standards of the Expansion Joint Manufacturers Association of the United States (Standards af the Expansion Joint ManufacturersAssociatian,INC), and combined with the actual situation of expansion joint design, manufacturing, inspection and quality management in China in recent years. In the standard, the basic parameters and dimensions of the overall forming of the bellows, thickness less than 2mm The contents and requirements of the quality classification of the radiographic inspection of the butt weld of the corrugated pipe, the welding process assessment of the corrugated pipe with a thickness less than 1.5mm, the type inspection, storage and installation of the expansion joint, and the design and manufacturing quality management of the expansion joint are all newly added to this standard. From the date of implementation, this standard will replace Appendix E\U-shaped expansion joints\ and JB1121-83 corrugated expansion joints in GB150-89 Steel Pressure Vessels.
Appendix A and Appendix B of this standard are both standard appendices. This standard is issued by the National Pressure Vessel Standardization Technical Committee. This standard is under the jurisdiction of the Manufacturing Subcommittee of the National Technical Committee for Standardization of Yuli Containers. This standard was drafted by the Hefei General Machinery Research Institute and the Planning Institute of Sinopec Corporation, and the Machinery Plant of Liaoyang Chemical Fiber Company and Shanghai Electric Power Construction and Repair Plant participated in the drafting.
The main drafters of this standard are Cai Shanyang, Li Jianguo, Jin Rijia, Li Pingjin, Pei Xinlian, and Dai Weitao. 1 Scope
National Standard of the People's Republic of China
Pressure Vessel Corrugated Expansion Joints
Bellows GH 16749-1997
1.1This standard specifies the design, manufacture, inspection, acceptance, storage, installation and basic parameters and dimensions of bellows expansion joints (hereinafter referred to as "expansion joints").
1.2This standard applies to single-layer or multi-layer U-shaped expansion joints without reinforcement for steel pressure vessels, steel shell and tube heat exchangers and atmospheric pressure vessels. Pipeline expansion joints can also be used for reference.
1.3The design pressure of the expansion joints to which this standard applies is not more than 6.4MPa, and the design temperature range is determined according to the allowable service temperature of the steel. 1.4This standard does not apply to expansion joints for pressure vessels heated by direct flames. 2 Cited standards
The clauses contained in the following standards constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be replaced. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB150—89 Steel Pressure Vessels
GB228—87 Metal Tensile Test Method
GB/T 229—94 Metal Charpy Notch Impact Test Method Metal Bending Test Methodbzxz.net
GB 232--883
GB 700—88
Carbon Structural Steel
GB 713—86
GB 912—89
GB 985—88
GB 986—88
Carbon steel and low alloy steel plates for boilers
Carbon steel and low alloy structural steel
Basic forms and dimensions of weld grooves for gas welding, manual arc welding and gas shielded weldingBasic forms and dimensions of weld grooves for submerged arc weldingGB/T 1804—92
General tolerancesEndnote tolerances for linear dimensions
GB 3098.1—82
Mechanical properties of fastenersBolts, screws and studsGB 3098.2—82Mechanical properties of fasteners
GB 3098. 6—86Mechanical properties of fastenersStainless steel bolts, screws, studs and nutsHot-rolled thick steel plates and strips of carbon and low alloy structural steelGB 3274-—88
Stainless steel cold-rolled steel plates
GB 3280-92
GB 332387
GB 423792
Radiography and quality classification of fusion welded butt joints Hot-rolled stainless steel plates
1 Steel plates for welded gas cylinders
GB 6653-94
GB6654—96
Carbon steel and low alloy steel thick plates for pressure vessels Seamless steel pipes for conveying fluids
GB 816387
GB 9948—88
Seamless steel pipes for petroleum cracking
Approved by the State Administration of Technical Supervision on March 4, 1997 and implemented on August 1, 1997
GB/T 13306—91 Labels
GB 167491997
GB/T14975—94 Seamless stainless steel pipe for structure GB/T14976—94 Seamless stainless steel pipe for fluid transportation JB2536—80 Paint, packaging and transportation of pressure vessels JB4708—92 Welding procedure assessment for steel pressure vessels JB/T4709—92 Welding procedure for steel pressure vessels JB4730—94 Non-photographic inspection of pressure vessels
3 General
3.1 Qualifications and responsibilities
3.1.1 Qualifications
3.1.1.1 The design and manufacturing units of expansion joints must have a sound comprehensive quality management system and system. 3.1.1.2 The welding of expansion joints must be performed by welders holding the corresponding category welder qualification certificate issued by the labor department. 3.1.1.3 The non-destructive testing of expansion joints must be performed by personnel holding the intermediate or above non-destructive testing personnel qualification certificate for the corresponding method issued by the labor department.
3.1.2 Responsibilities of the design unit
3.1.2.1 The design unit shall be responsible for the completeness and accuracy of the design documents. 3.1.2.2 The design documents of the expansion joint shall at least include the design calculation book and the design drawings. 3.1.3 Responsibilities of the manufacturing unit
3.1.3.1 The manufacturing unit shall manufacture in accordance with the design drawings. If the original design needs to be changed, the approval of the original design unit shall be obtained. 3.1.3.2 During the manufacturing process and after completion of the expansion joint, the quality inspection department of the manufacturing unit shall conduct various specific inspections and tests on the expansion joint according to the standards and drawings, submit an inspection report, and be responsible for the completeness and accuracy of the report. 3.1.3.3 Each expansion joint shall have at least the following technical documents for reference, which shall be kept for no less than 7 years. a) Manufacturing process drawing or manufacturing process card, b) Material quality certification documents and material list, c) Welding process and heat treatment process records; d) Inspection records during the manufacturing process and after completion, e) Expansion joint process drawing.
3.2 Names of the expansion joint parts
The names of the expansion joint parts are shown in Figure 3-1. 3.3 Thickness addition
The thickness addition C is calculated according to formula (3-1):
C= C,+ Cz +C, mm
The negative thickness deviation of the steel plate or the steel pipe is selected according to the corresponding steel plate or steel pipe standard, where: Ci—
*...*(3-1
When the limited negative thickness deviation value of the steel plate is 0.25mm, the negative thickness deviation C of the steel plate should also be included in the design calculation of the corrugated pipe.
Cz corrosion allowance, mm;
For carbon steel and low alloy steel, take C≤1mm1When C>1mm, select austenitic stainless steel (When stainless steel is not suitable, C, can be selected according to the design requirements of the container)For austenitic stainless copper, when the corrosiveness of the medium is extremely low, take C,=0 mm.
C.——Wall thickness forming reduction, m;
Expansion joint manufacturers should determine the forming reduction according to the manufacturing process conditions and take into account the actual thickness of the plate, but it shall not exceed 10% of the bellows wall thickness.
4 Product classification
4.1 Structural type and specification series
GB16749—1997
Medium planting
1-end plate 12-bellows; 3-pull rod or positioning screw 4-nut; 5-inner bushing; 6-end pipe
Figure 3-1 Names of various parts of the expansion joint
4.1.1 The various structural types of expansion joints are shown in Figures 4-1 to 4-16, and their specifications are shown in Table 4-1. The basic parameters and dimensions are shown in Appendix A (Standard Appendix).
Table 4-1
Nominal pressure PN
Expansion joint type
Zx expansion joint
ZD expansion joint
HF expansion joint
HZ expansion joint
150~2000
Nominal diameter DN
150~1200
150~800
150~2000
150~350
150~1200150350
4.1.2 For expansion joints outside the specification series of this standard or non-standard design, the calculation can be carried out in accordance with Chapter 6. The design, manufacture, inspection, test and acceptance requirements shall not be lower than the provisions of this standard. 4.2 Marking of expansion joints
4.2.'1 Marking method
Expansion joint
DN-PN-mXsXnX(A)
GB 167491997
GB 16749—1997
Standard number
-Bellows material code, see Table 5-1
Thickness, mm
Nominal pressure, MPa
Nominal diameter, mm
Type code, see Table 4-2
4.2.2 The expansion joint type code consists of two parts: structure code and use code. The symbol description shall be in accordance with the provisions of Table 4-2. Table 4-2
Type code
WC (A)
4.2.3 Marking example
Indicates an integrally formed small-wave high expansion joint, see Figure 4-14-4Indicates an integrally formed large-wave high expansion joint, see Figures 4-5 to 4-8
Indicates an expansion joint welded from two half-wave parts, see Figures 4-9 to 4-12Indicates an expansion joint welded from two half-wave parts with straight edges, see Figures 4-13 to 4-16Indicates used on vertical equipment
Indicates used with an inner village sleeve on vertical equipment
Indicates used on horizontal containers
Indicates used with an inner village sleeve on horizontal equipment
Type A. The table indicates that the plug with thread is suitable for single-layer expansion joints with no fatigue design requirements.
indicates that there is no thread, which is suitable for single-layer and multi-layer expansion joints with fatigue design requirements.
Example 1: 0Cr18Ni11Ti horizontal single-layer (wall thickness 2.5mm) four-wave integrally formed expansion joint without thread plug (using small wave height), its nominal pressure PN0.6MPa, nominal diameter DN1000mm, then its mark is: expansion joint ZXW(B)1000-0.6-1X2.5X4(N)GB16749—1997 Example 20Cr18Ni11Ti horizontal single-layer (wall thickness 6mm), 2-wave integrally formed expansion joint without thread plug (using large wave height), its nominal pressure PNo.6 MPa, nominal diameter DN1000 mm, then its mark is: expansion joint ZDW(B)1 000-0. 6-1X6X2(N)GB 16749-1997 Example 3: 0Cr18Ni11Ti horizontal single-layer (wall thickness 6mm) single-wave stamping expansion joint without plugging, its nominal pressure PN0.6MPa, nominal diameter DN1000mm, then its mark is: expansion joint HFW (B) 1000-0.6-1×6×1 (N) GB16749-1997 Example 4; 0Cr18Ni11Ti horizontal single-layer (wall thickness 6mm) single-wave with straight edge stamping expansion joint without plugging, its nominal pressure PNo.6MPa, nominal diameter DN1000 mm, then its mark is: expansion joint HZW (B) 1 000-0.6-1×6X×1 (N) GB 16749-1997 point
GB 16749--1997
Figure 4-1ZXL type (vertical)
Figure 4-2ZXW (B) type <horizontal)
Constant end Minka
GB16749-1997
Figure 4-3ZXLC type <vertical liner)
Medium flow direction
Figure 4-4ZXWCType (horizontal type with inner sleeve)
GB 16749-1997
(e)DN150-35umm
(b)DN400~-2000mm
Figure 4-5ZDL type (vertical type)
(e)DN150~350mm
Figure 4-6ZDW type (horizontal type)
GB 16749-1997
DN400~2 000 mm
Figure 4-6 (end)
(a) DN150350 mm
Figure 4-7ZDLC type (vertical inner casing)
Ascending flow direction
GB16749—1997
(b)DN400~2 000 mm
Figure 4-7 (Finish)
(a) DN150~350mm
Medium flow direction
Figure 4-8ZDWC type (horizontal sleeve
Medium flow direction!
GB167491997
(b) DN400~2000mm
Figure 4-8 (Finish)
(a) DN150~350mm
(b) DN400~2000mm
Figure 4-9HFL type (vertical)
Medium full direction
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