Some standard content:
JB | Heads
Formed heads for steel pressure vessels02-08-22 released
2003-03-01 real
State Economic and Trade Commission released
Words
Scope
Example reference documents
Symbols
Type parameters and markings
Materials
Manufacturing, inspection and acceptance
Factory quality certificate Documents
No paint, packaging and transportation
According to A (informative appendix)
Thin B (informative appendix)
C (informative appendix)||tt| |Record D (Informative Appendix)
E (Informative Appendix)
Thick F Informative Appendix)
Green G Informative Appendix)
Houwang Informative Appendix)
Informative appendix)
Head forming thickness reduction rate
Mesh
EHA elliptical head type parameters
EHB elliptical Shaped head type parameters
DHA dished head type parameters
DHB dished head type parameters
CHA conical head type parameters·
CHB conical Head type parameters
CHC conical head type parameters,
PSH spherical head type parameters
times
JB/T4746—2002||tt| |25
27
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35
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46
50
53
56|| tt||59
Foreword
This standard replaces the following standards from the date of promulgation: IB576-1964 Disc Head
JB/T4729-1994 Spinning Head| |tt||JB/T4737--1995 Oval head
B/T4738--199590° Folded conical head JB/T4739--199560° Folded conical head This standard is consistent with the above Compared with the five replaced standards, the main difference is: JB/T4746-2002
breaks the previous pattern of separately formulating head standards according to different structural types and manufacturing methods. For the first time, different structural types, different The heads of manufacturing methods are also included in the human standard, which proposes unified manufacturing, inspection and acceptance requirements; in the past, each head standard was only applicable to heads for steel pressure vessels designed according to rules. This standard covers both heads designed according to rules. The heads for steel pressure vessels also include the heads for steel pressure vessels designed according to analysis; this standard adds the trimming delivery of the head end, the inclination of the straight edge, the tolerance of the outer circumference or inner diameter, Technical requirements such as head roundness tolerance and thickness reduction of formed heads; this standard increases the quality requirements for the shape tolerance of the inner surface of the head and the longitudinal wrinkles of the straight edge portion; the materials and design calculations of the heads governed by this standard should be separately It complies with the relevant requirements of GB150-1998 "Steel Pressure Vessels" and JB4732-1995 "Steel Pressure Vessels - Analysis and Design Standards". All appendices to this standard are informative appendices. This standard was proposed by the National Pressure Vessel Standardization Technical Committee. This standard was approved by the National Economic and Trade Commission. This standard is under the jurisdiction of the Manufacturing Subcommittee of the National Pressure Vessel Standardization Technical Committee. The unit responsible for drafting this standard: Hefei General Machinery Research Institute. Units participating in the drafting of this standard: Yueyang Petrochemical General Plant Machinery Factory, Qilu Petrochemical Company Machinery Factory, Yixing Beihai Head Co., Ltd. The main drafters of this standard: Wang Bing, Zhang Zhiting, Zhang Zhixian, Deng Jiande, Liu Min, Li Chunyao, Zheng Weidong . This standard is interpreted by the National Pressure Vessel Standardization Technical Committee. Scope
Heads for steel pressure vessels
JB/T4746--2002
1.1 This standard specifies the manufacturing, inspection and acceptance requirements for heads for steel pressure vessels. At the same time The Changsan golden formula and parameters of the head for steel pressure vessels are given.
7.2 The types and parameters given in this standard are applicable to the heads of steel pressure vessels formed by stamping, spinning and rolling of the whole plate or combined plates of the types listed in Table 1.
1.3 The manufacturing, inspection and acceptance requirements specified in this standard apply not only to the types of heads listed in Table 1, but also to stamping, spinning and rolling of other types and parameters of ink plates or panels. Formed steel pressure vessels are available with oval, dish, flanged cone and spherical crown heads. 2 Normative reference documents
The provisions in the following documents become provisions of this standard through reference in this standard. For dated documents, all subsequent amendments (excluding corrigendums) or revisions do not apply to this standard. However, parties who reach an agreement based on this standard are encouraged to study whether they can use these documents. The latest version of. For undated referenced documents, the latest edition applies to this standard. CB150--1998 Steel Pressure Vessels
GB/T1804-2000 General Tolerances Tolerances of Linear and Angular Dimensions without Note of Tolerance JB4708-2000 Steel Pressure Vessel Welding Process Qualification JB4730-1994 Non-Destructive Testing of Pressure Vessels||tt ||JB4732 - 1995 Steel Pressure Vessels - Analysis and Design Standard Pressure Vessel Safety Technical Supervision Regulations (formerly issued by the State Bureau of Quality and Technical Supervision in 1999) 3 symbols
.4 - Inner surface area of ??the head, m2; || tt||C,
DN-
- Steel thickness negative deviation, selected according to the corresponding steel plate standard, mm; nominal diameter of the head (as specified in Table 1), mm; oval, dish and The inner diameter of the spherical crown head or the inner diameter of the big end of the flanged tapered head, mm; D.
D
The inner diameter of the small end of the flanged tapered head, mm; D. | |tt | The outer diameter of the small end of the head, mm; the total depth of the dish-shaped, spherical-shaped head and the elliptical head based on the inner diameter, or the total height of the folded tapered head and the elliptical head based on the outer diameter, mm;| |tt||H—Total height from folded conical head to cone top, mm; h—Height of straight edge of circular, dish-shaped and folded conical heads, mm; m—Head mass, kg ;
R;Inner radius of the spherical part of a dish-shaped, spherical crown-shaped head, mm; Inner radius of the corner of the transition section of the large end of a dish-shaped, folded tapered head, mm; Folded tapered head Inner radius of the corner of the small end transition section, mm; I--head volume, m;
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JB/T4746—2002
Half vertex angle of a folded tapered head , (\); 8, - nominal thickness of the head, mm;
8. --Steel thickness, that is, the thickness specified in the steel plate quality certificate, mm. 4 Type parameters and markings
4.1 The name, cross-sectional shape, type code and type parameter relationship of the head are shown in Table 1. 4.2 The size, inner surface area, volume and mass of each type of head are shown in Appendix B to Appendix I respectively. . 4.3 The head mark shall be as follows:
?? ); ③ Nominal thickness of the head (unit: mm); ④ Head material grade:
?—Standard number: JB/T4746
Example 1:
Nominal diameter 2400mm, nominal Thickness 20mm, R;=1.0D,, T=0.15D,, The disc-shaped head made of 0Cr18Ni9 is marked as follows: DHA2400×20-0Cr18Ni9JB/T4746 Example 2:
The oval head with a nominal diameter of 325mm, a nominal thickness of 12mm, a material of 16MnR, and an outer diameter-based oval head is marked as follows ：EHB325×12-16MnRJB/T4746
Table 1
name
oval head
name
based on inner diameter
Based on the outer diameter
Dish-shaped head
28
Sectional shape
D
D|| tt||Type code
EHA
EHB
DHA
DHB
Type parameter relationship
D
2( Hh)=2
DN=D
D.
2(H-)=2
DN=D.
R;=1.0D
T=0.15D
DN=D
R,=1.0D
T=0.10D||tt| |DN=D
Name
Name
Flanged conical head
Folded conical head
Spherical head|| tt||5 Materials
Table 1 (continued)
Sectional shape
p
D.
Type code
CHA|| tt||CHB
CHC
PSH
JB/T47462002
Type parameter relationship
r=0.15D
α=30g| |tt||DN= D
=0.15D
α = 450
DV= D:
T=0.15D
2 = 60#
r,=0.10D
DV=D.
R,=1.0D
DN= D.
5.1 The steel plate for the head using rule design or analysis design shall not only comply with the requirements for steel for pressure components of pressure vessels in GB150-1998 or JB4732--1995 respectively, but also shall comply with the drawings or ordering technical agreement. Require. 5.2 The head manufacturing unit shall inspect and accept the steel plates according to the quality certificate, and shall conduct re-inspection if necessary. If there is no valid steel quality certificate from the steel production unit, it should be handled in accordance with the relevant provisions of the "Pressure Vessel Safety Technical Supervision Regulations" (1999). 29
JB/T4746-2002
6 Manufacturing, inspection and acceptance
6.1 General principles
6.1.1 The manufacturing, inspection and acceptance of the head should comply with this standard In addition to the regulations, it should also comply with the requirements of the drawing or ordering technical agreement. 6.1.2 The head manufacturing unit should establish and improve a quality system that complies with the relevant laws and regulations of the national pressure vessel safety supervision agency to ensure the quality of the head.
6.1.3 Tailor welding of the head should be performed by personnel holding the corresponding qualification "Boiler and Pressure Vessel Welder Qualification Certificate". 6.1.4 The non-destructive testing of the head should be performed by personnel holding the "Boiler and Pressure Vessel Non-destructive Testing Personnel Qualification Certificate" of the corresponding type and technical level. The technical level of personnel who conduct non-destructive testing of the analyzed and designed heads shall not be lower than Level II. 6.1.5 All steel plates used to manufacture the head should have confirmation marks for inspection and tracking. During the manufacturing process, if the original confirmation mark is cut off or the steel plate is divided into pieces, the transplantation of the mark should be completed before cutting the steel plate. The expression method of the confirmation mark is specified by the head manufacturing unit. 6.1.6 For heads made of stainless steel and composite steel plates with anti-corrosion requirements, hard stamping shall not be used on the anti-corrosion surface as material confirmation marks and welder marks.
6.1.7 For heads used in cryogenic pressure vessels and heads that require fatigue analysis and design, hard stamping shall not be used as material confirmation marks and welder marks.
6.2 Bad material preparation
6.2.1 The rough thickness of the head should consider the process thinning amount to ensure that the measured minimum thickness after the head is formed meets the requirements of 6.3.10. 6.2.2 Mechanical damage to the surface of the steel plate should be avoided during manufacturing. The grinding and welding repair of scars shall comply with the relevant regulations of GB150-1998 or JB4732-1995 respectively according to the design standards adopted for the head. 6.2.3 Groove surface requirements
a) The groove surface shall not have cracks, delaminations, inclusions and other defects. The lower limit of the standard tensile strength, the groove surface of the flame-cut steel plate and Cr-Mo low alloy steel plate >540MPa should be smoothed with a sand b)
wheel, and magnetic particle or penetrant testing should be performed on the processed surface. Before welding, oxides, oil, c
slag, dust, iron powder and other harmful substances should be removed within 20mm of the surface of both sides of the groove and the base metal (measured as the distance from the edge of the groove) Impurities. 6.2.4 The offset amount b (see Figure 1) of the spliced ??panels shall not be greater than 10% of the steel thickness 3, and shall not be greater than the offset amount 6 of the 1.5mm spliced ??composite steel plate (see Figure 2) shall not be greater than the steel plate cladding 30% of the thickness, and not greater than 1.0mm. AI
Figure 1
6.2.5 The welding process qualification before tailor welding shall be carried out in accordance with JB4708-2000. Figure 2
The retention period of the welding process evaluation report, welding process specifications, welding records and welder identification marks, according to the design standards adopted for the head, should respectively comply with the relevant requirements of GB150--1998 or JB4732-1995 Regulation. 6.2.6 For tailor-welded seams on the inner surface of elliptical, dish-shaped and spherical heads that are first assembled and then formed, as well as tailor-welded seams on the outer surface that affect the forming quality, the weld reinforcement should be polished to The chamber is flush with the parent material. 6.2.7 Before forming the tapered head, the weld reinforcement on the inner and outer surfaces of the transition part should be polished to be flush with the base metal. 6.2.8 The unpolished weld reinforcement shall comply with the relevant provisions of GB150-1998 or JB4732--1995 according to the design standards adopted for the head.
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6.2.9 The surface of spliced ??welded joints shall be free of cracks, undercuts, pores, arc craters and spatter. JB/T4746-2002
6.2.10 The repair of spliced ??welded joints shall comply with the relevant regulations of GB150-1998 or JB4732-1995 according to the design standards adopted for the head.
6.2.11 After the bad material is cut into circles, the surrounding defects that affect the forming quality of the head should be ground and eliminated. 6.3 Head forming
6.3.1 Depending on the type, specification, and material of the head, it can be formed by cold stamping, hot stamping, cold spinning, hot spinning, cold rolling, hot rolling, etc. 6.3.2 The end of the formed head should be trimmed as a measurement benchmark for size and shape inspection. The head is not allowed to be delivered with rough edges. If the end needs to be beveled, the shape and size of the bevel shall be determined by the supplier and the buyer in the ordering technical agreement. 6.3.3 The method for determining the straight edge inclination of oval, dish-shaped and folded conical heads is shown in Figure 3. The inclination must comply with Table 2 to be qualified. When measuring the inclination of the straight edge of the head, the thickened portion of the straight edge should not be included. 6.3.4 Whether the connection between the head and the cylinder is based on the outer circumference or the inner diameter shall be determined by the ordering technical agreement between the supplier and the buyer. The outer circumference tolerance and the inner diameter tolerance shall comply with the requirements of 6.3.4.1 and 6.3.4.2. Inclination
Inclination "
After trimming the head, pull a steel wire or place a ruler in the diameter direction of the end face of the head, and use the straight edge of the right-angle ruler to align it with the tightened steel wire or straight edge. Ruler weight platform. The other right-angled edge is in contact with the head. The maximum distance between the right-angled ruler and the head is measured on the straight edge, which is the straight-edge inclination of the head. Figure 3
Table 2
Straight edge height h
towards
25
40
others
outside
≤1.5
≤2.5|| tt | | tt | The circumference of the circle and the tolerance of the outer circle circumference should meet the requirements of Table 3. The design value of the outer circle circumference is: Yuan×D or Yuan (8.×2+D.). Among them, Yuan is taken as 3.1416. Table 3
Nominal diameter DN
300≤DN<600
600DN1000
Steel thickness,
2≤8<4
4 ≤8,<6
6≤816
4≤6
6≤8.<10
10≤<22
Outer circle circumference tolerance
4~+4
-6~+6
-9~+9
-6~ +6
-9~ +9| |tt||-9 ~ +12
mm
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JB/T 47462002
Nominal diameter DV
1000≤DN<1600|| tt||1600≤ DN<3000
3000≤ DN<4000
4000DN≤5000
5000sDN≤6000
Table 3 (continued)
Steel thickness. .
6≤8,<10
10≤22
22≤8,40
6≤8.<10
10≤8,22
22≤60
10≤8,22
22≤8,<60
12≤22
22≤860
16≤≤60
Outer circle circumference tolerance
-9~+9
-9~+12
12~+18
-9~ +9
-9~+12
-12~+18
-9~+12
-12~+18
-9~ +12
-12~+18
-12~+18
mm
6.3.4.2 After trimming the head with the inner diameter as the docking standard, Take the average of the four measured inner diameters distributed equidistantly on the side part, and the inner diameter tolerance should comply with the requirements of Table 4.
Table 4
Nominal diameter DN
300≤DN<600
600≤DN<1000
1000≤DN<1600
1600≤ DN<3000
3000≤DN4000
4000≤DN<5000
5000DN≤6000
Steel thickness 8.
2≤8,<4
4≤8.<6
6≤8<16
4≤86
6≤10|| tt||10≤. 22
6≤10
10≤,<22
22≤40
6≤8,<10
10≤822||tt| |22≤860
1022
22≤8,60
12≤8,<22
22≤60
16860
Inner diameter tolerance
1.5~+1.5
-2~+2
-3~+3
-2~+2
-3~ +3
-3~+4
-3~+3
3~+4
-4~+6
-3~+ 3
-3~+4
-4~+6
3~+4
-4~+6
-3~+4
-4~+6
-4~+6
mm
6.3.5 After trimming the head, measure the four angles distributed equally at the straight edge. For each inner diameter, the difference between the actual measured maximum value and the minimum value is used as the roundness tolerance. The roundness tolerance should not be greater than 0.5%D and not greater than 25mm; when 8/D is <0.005 and <12mm, the roundness tolerance should not be greater than 0.8 %D and not larger than 25mm
6.3.6 After trimming the head, place a ruler or tighten the steel wire at any two diameter positions on the end face of the head, and measure the total depth of the head vertically at the intersection of the ruler or steel wire. (Total head height), total head depth (total head height) tolerance is (-0.2~0.6)%D. 32
6. After trimming the head, place a ruler or tighten the steel wire at any two diameter positions on the end face of the head. Vertically measure the total depth of the head (total height of the head) at the intersection of the ruler or the steel wire. The total depth of the head (total height of the head) The total head height) tolerance is (-0.2~0.6)%D. 32
6. After trimming the head, place a ruler or tighten the steel wire at any two diameter positions on the end face of the head. Vertically measure the total depth of the head (total height of the head) at the intersection of the ruler or the steel wire. The total depth of the head (total height of the head) Total head height) tolerance is (-0.2~0.6)%D. 32
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