JB/T 6539-1992 PDF in English
JB/T 6539-1992 (JB/T6539-1992, JBT 6539-1992, JBT6539-1992)
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Steel pressure vessel for micro-air compressor
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JB/T 6539-1992: PDF in English (JBT 6539-1992) JB/T 6539-92
JB
J 72
Machinery Industry Standard
of the People’s Republic of China
Steel pressure vessels for miniature air compressors
ISSUED ON. DECEMBER 25, 1992
IMPLEMENTED ON. JULY 1, 1993
Issued by. Ministry of Machinery and Electronics Industry of the
People’s Republic of China.
Table of Contents
1 Subject content and application scope ... 3
2 Reference standard ... 3
3 Terms ... 4
4 General provisions ... 6
5 Forms and basic parameters ... 9
6 Materials ... 10
7 Cylinders and heads ... 13
8 Openings and connecting tubes ... 16
9 Support and plates ... 21
10 Manufacturing, inspection and acceptance ... 22
11 Accessories ... 30
Additional information... 32
Steel pressure vessels for
miniature air compressors
1 Subject content and application scope
This Standard specifies the basic requirements for the design, manufacturing,
inspection and acceptance of steel pressure vessels for miniature air
compressors (hereinafter referred to as “pressure vessels”).
This Standard applies to the pressure vessels for miniature air compressors
whose design pressure is less than 1.6MPa, nominal volume is greater than
or equal to 25L, and less than 450L. The operating temperature of pressure
vessels is within the range of 0°C ~ 200°C.
The pressure vessels for other compressors whose design pressure and
nominal volume are equivalent to the above-mentioned provisions may refer
to this Standard.
2 Reference standard
GB 150 Steel pressure vessels
GB 699 Quality carbon structure steel – Technical requirements
GB 700 Carbon structural steels
GB 713 Plates of carbon steels and low alloy structural steels for boilers
GB 912 Hot-rolled sheets and strips of carbon structural steels and high
strength low alloy structural steels
GB 985 Basic forms and sizes of weld grooves for gas welding, manual arc
welding, and gas-shielded arc welding
GB 986 Basic forms and sizes of weld grooves for submerged arc welding
GB 3077 Alloy structure steel – Technical requirements
GB 3274 Hot-rolled plates and strips of carbon structural steels and high
strength low alloy structural steels
GB 3323 Methods for radiographic inspection and classification of
radiographs for fusion welded butt joints in steel
GB 5681 Hot-rolled steel strips for pressure vessels
GB 6479 Seamless steel tubes for high-pressure for chemical fertilizer
equipment
GB 6653 Steel plates for welded gas cylinders
GB 6654 Carbon and low alloy steel plates for pressure vessels
GB 8163 Seamless steel tubes for liquid service
JB 1152 Ultrasonic inspection for butt welds of boilers and steel pressure
vessels
JB 2536 Painting, packaging and transportation of pressure vessels
JB 4708 Welding procedure qualification for steel pressure vessels
JB/T 4709 Welding specification for steel pressure vessels
JB/T 6441 Safety valves for compressors
3 Terms
3.1 Working pressure
It refers to the gauge pressure in the pressure vessels under normal
operating conditions.
3.2 Rated working pressure
It refers to the pressure specified by the pressure vessel model, whose value
is equal to that of the rated exhaust pressure of compressors.
3.3 Maximum working pressure
It refers to the maximum gauge pressure that might achieve in the pressure
vessels under normal operating conditions.
3.4 Design pressure
It refers to the pressure used for determining the wall thickness of pressure
vessels, which is 1.05 to 1.1 times the value of the rated working pressure.
However, the design pressure shall not be lower than the maximum working
according to the manufacturing process and actual steel thickness, so as to
ensure that the actual thickness of each part of the pressure vessel is not less
than the design thickness.
4 General provisions
The pressure vessels shall be manufactured according to the provisions of
this Standard, the drawings and technical documents or agreements
approved by prescribed procedures.
4.1 Designated Scope
The scope of pressure vessels designated in this Standard is as follows.
4.1.1 The first flange sealing surface of the connecting tube.
4.1.2 The first screwed connection of the connecting tube.
4.1.3 The first circumferential weld of the connecting tube.
4.1.4 The pressure control and safety relief devices and meters directly
installed on the pressure vessels shall conform to the relevant provisions of
this Standard.
4.2 Allowable stress
Each intensity data of steels and bolts is respectively divided by the safety
factors, given in Tables 1 and 2. TAKE the smaller value.
Table 1
Intensity Performance Minimum Tensile Strength at Room Temperature σb
Yield Point at Room Temperature
or Design Temperature σs or σts
Carbon Steel & Low Alloy Steel Safety Factor n ≥ 3.0 ns ≥ 1.6
Table 2
Steel Bolt Diameter mm Heat Treatment Conditions
Safety Factor of Yield
Point at Design
Temperature ns
Carbon Steel ≤ M22 Hot Rolling & Normalizing
2.7
M22~M48 2.5
Low Alloy Steel &
Alloy Steel
≤ M22 Normalizing &
Hardening and
Tempering
3.5
M22~M48 3.0
5.2 Pressure parameters
The rated working pressure of pressure vessels shall be selected according
to Table 3.
Table 3 MPa
0.25 0.4 0.5 0.7 1.0 1.25 1.4
5.3 Cylinder diameter
5.3.1 When using steel plates to rolling cylinders, the nominal diameter shall
be selected according to Table 4. At this moment, the nominal diameter of
cylinders refers to the inner diameter of cylinders.
Table 4 mm
150 200 250 300 350 400 450 500 550
5.3.2 When using steel pipes as cylinders, the nominal diameter of cylinders
shall be selected according to GB 8163. At this moment, the nominal
diameter of cylinders refers to the outer diameter of steel pipes.
6 Materials
6.1 General requirements
6.1.1 The steel plates and pipes used for manufacturing the pressure
vessels shall have material certificates (or copies). The manufacturing
organizations shall perform acceptance according to the certificates.
6.1.2 The steels for pressure parts of pressure vessels shall conform to the
provisions specified in this Chapter. For other materials, if their performance
is not worse than the material performance specified in this Chapter, it is
allowable to be used for substitute.
6.1.3 The steels and corresponding welding materials listed in this Chapter
shall also meet the requirements of corresponding standards.
6.2 Steel plates
6.2.1 When using the boiling carbon steel plates and killed carbon steel
plates for manufacturing pressure vessels, the scope shall conform to the
provisions specified in Table 5.
Table 7
Steel
designation
Steel
Pipe
Standard
Thickness
mm
Strength Index at
Room Temperature
Allowable Stress at the Following
Temperatures (°C)
MPa
σb
MPa
σs
MPa ≤ 20 100 150 200
Carbon Steel Tubes
10 GB 8163 ≤ 10 335 205 112 108 101
20 GB 8163 ≤ 10 390 245 130 123
Low Alloy Steel Tubes
16Mn GB 6479 ≤ 16 490 320 163 159
6.3.2 For the tubes of carbon steels and low alloy steels applied to the
pressure vessel cylinders, the pressure vessel manufacturing organizations
shall extract one tube from each batch for rechecking the mechanical
properties.
6.4 Bolts
The steel designation and allowable stress of bolts shall conform to the
provisions specified in Table 8.
Table 8
Steel
designation
Steel
Plate
Standard
Using Status
Bolt
Specifications
mm
Strength Index at
Room Temperature
Allowable Stress at the
Following Temperatures
(°C)
MPa
σb
MPa
σs
MPa ≤ 20 100 150 200
Carbon Steel Bolts
Q235-A
(A3, AY3) GB 700 Hot Rolling < M24 370 235 87 78 74 69
35 GB 699 Normalizing < M24 530 315 117 105 98 91
Low Alloy Steel Bolts
30CrMoA GB 3077 Hardening & Tempering < M24 805 685 196 176 171 167
6.5 Welding materials
6.5.1 The recommended welding materials for pressure vessels are given in
Table 9.
6.5.2 If using the materials of different steel designations for welding, the
welding materials shall be determined by test, or shall conform to the
provisions of relevant welding procedure regulations and standards.
Table 9
Steel
Designation
Arc Welding Submerged Arc Welding
Steel
Designation
of Welding
Wires for
Carbon
Dioxide
Gas-shielded
Arc Welding
Steel
designation
of Welding
Wires for
Argon Arc
Welding
Welding
Rod
Model
Corresponding
Trademark
Example
Steel
Designation
of Welding
Wires
Welding Flux
Model
Corresponding
Trademark
Example
Q-235-A, F
(A3F)
E4303 J422 H08 H08Mn HJ401-H08A HJ431 H08Mn2Si -
Q-235-A
(A3)
Q-235-B,
Q-235-C,
20g, 20R,
20HP
E4316 J426 H08A
H08MnA HJ401-H08A HJ431 H08Mn2Si - E4315 J427
16MnR E5016 J506 H10MnS
H10Mn2
HJ402-H10Mn2 HJ350 H08Mn2SiA H10Mn2 16Mn E5003 J502 HJ401-H08A HJ431
7 Cylinders and heads
7.1 Symbol instructions
Di – Inner diameter of cylinders or...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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