This standard specifies the basic requirements for the design, manufacturing, inspection and acceptance of steel pressure vessels for micro air compressors. This standard applies to pressure vessels for micro air compressors with a design pressure less than 1.6 MPa and a nominal volume greater than or equal to 25 L and less than 450 L. The operating temperature range of pressure vessels is 0~200℃. Other pressure vessels for compressors whose design pressure and nominal volume are equivalent to those specified above may be implemented with reference to this standard. JB/T 6539-1992 Steel pressure vessels for micro air compressors JB/T6539-1992 Standard download and decompression password: www.bzxz.net

J72 | | tt | | JB | tt||Ministry of Mechanical and Electronic Industry of the People's Republic of China 1993-07-01 Implementation
Release
Mechanical Industry Standard of the People's Republic of China
Steel Pressure Vessels for Micro Air Compressors 1 Topic Content and scope of application
JB/T6539-92
This standard specifies the basic requirements for the design, manufacturing, inspection and acceptance of steel pressure vessels for micro air compressors (hereinafter referred to as "pressure vessels") .
This standard applies to pressure vessels for micro air compressors with a design pressure less than 1.6MPs and a nominal volume greater than or equal to 25L and less than 450L. The operating temperature range of pressure vessels is .0~200℃. Other pressure vessels for compressors whose design pressure and nominal volume are equivalent to those specified above may be implemented with reference to this standard. 2 Reference standards
GB150
GB699
GB700
GB713
GB912
GB-985
GB986||tt ||GB3077
GB.3274
GB3323
GB5681
GB6479
GB6653
GB6654
GB8163||tt ||JB1152
JB2536
JB4708
JB/T:4709
JB/T6441
3 terminology
3.1 Work pressure|| tt||Copper pressure vessels
Technical conditions of high-quality carbon structural steel
Carbon structural steel
Carbon steel and low alloy structural steel steel plates for boilers Carbon structural steel and low Alloy structural steel hot-rolled thin steel plate and steel strip gas welding, manual arc welding and gas shielded welding basic types and dimensions of weld grooves basic types and dimensions of submerged submersible welding grooves technical conditions of alloy structural steel
Carbon structural steel and low-alloy structural hot-rolled thick pin plates and steel strips Melt-welded butt joints Radiographic phase and quality classification Hot-rolled steel strips for pressure vessels
High-pressure seamless steel pipes for fertilizer equipment||tt| |Steel plates for welded gas cylinders
Carbon steel and low alloy steel thick steel plates for pressure vessels Seamless steel pipes for conveying fluids
Butt welds for boilers and steel pressure vessels Ultrasonic flaw detection Pressure vessel painting and packaging , Yunfu
Steel pressure vessel welding procedure qualification
Steel pressure vessel welding regulations
Safety valve for compressors
refers to the pressure vessel under normal operating conditions The gauge pressure inside, 3.2 Rated working pressure
refers to the pressure specified by the pressure vessel model, and its value is equal to the rated exhaust pressure of the compressor. 3.3 Maximum working pressure
Ministry of Mechanical and Electronics Industry approved on 1992-12-25 for implementation on 1993-07-01
1
JB/T6539-92
refers to normal work During the process, the pressure vessel may reach as high as the gauge pressure. 3.4 Design pressure
refers to the pressure used to determine the initial thickness of the pressure vessel shell. Its value is equal to 1.05 to 1.1 times the rated working pressure, and shall not be lower than the maximum working pressure of the compressor.
3.5 Design temperature
refers to the highest temperature that the pressure vessel shell may reach under normal operating conditions. 3.6 Test temperature
refers to the temperature of the pressure vessel during the pressure test. 3.7 Thickness
3.7.1 The additional thickness C is calculated according to formula (1): CC, + C,
Where: C - the thickness negative tolerance of the steel plate or steel pipe, mm: C, - --Corrosion allowance. For sleeved lubrication compressor C, =0.5mm; for oil-free lubrication compressor C, =1.0mm, 3.7.2 Calculated thickness 8
refers to the thickness calculated according to the relevant formulas of this standard. 3.7.3 Design thickness 84
refers to the sum of calculated thickness and corrosion allowance.
3.7.4 Nominal thickness 8
(1
refers to the design thickness plus the negative deviation of the steel thickness and then circled upward to the thickness of the steel standard specification, that is, the thickness marked on the design drawing . 3.7.5 Effective thickness 8
refers to the nominal thickness minus the additional amount of steel thickness. The manufacturing unit should determine the processing allowance based on the manufacturing process conditions and the actual thickness of the steel to ensure the actual thickness of each part of the pressure vessel product. Not less than the design thickness.
4 General provisions
Pressure vessels shall be manufactured in accordance with the provisions of this standard and in accordance with the drawings and technical documents or agreements approved by the prescribed procedures, 4.1 Delimitation scope||tt ||This standard defines the scope of pressure equipment as follows: 4.1.1 The first flange sealing surface of the nozzle. 4.1.2 The first threaded joint of the nozzle
4.1.3 The first pass of the nozzle. Circumferential welds.
4.1.4 Pressure control, safety relief devices and instruments directly installed on the pressure vessel shall also comply with the relevant provisions of this standard. 4.2 Allowable stress
refers to the pressure. The strength data of steel and bolts are divided by the safety factors in Table 1 and Table 2, and the smaller value is taken. Table 1
Strength performance
Carbon cable steel, low alloy steel| |tt||2
Usually high tensile strength
An
n≥3.0
all
Reporting point at permanent or design temperature, into. Number
n≥1.6
steel
carbon cable pin
low alloy steel, alloy Steel
4.3 weld coefficient
Number of bolt diameter mm
GM22
M22~M48
SM22
M22~M48||tt ||JB/T653992
Table 2
Heat treatment status
Hot rolling, normalizing
Normalizing, quenching and tempering
Seam location and non-destructive testing requirements are selected. 4.3.1 Double-sided welding or full penetration butt weld equivalent to double-sided welding: 100% non-destructive testing
4=1. 0
Partially non-destructive. Flaw detection
4= 0. 85
Safety factor of care point under design layout
2.7
2.5
3. 5||tt| 0 | |tt||g=0.80
4.3.3 Single-sided butt weld, no backing plate
local non-destructive testing
4=0.70
4.3.4 for Seamless steel pipe used as cylinder:
4.4 welds
g1.0
The welds of pressure vessels are divided into four categories: A, B, C and D, as shown in Figure 1 Show. 4.4.1
D
Figure 1
a.
The longitudinal butt weld of the shell belongs to category A;
b.
The circumferential butt weld of the shell belongs to Category B;
The welds connecting the flange and the nozzle, the flat head and the shell belong to Category C; c.
d.
Nozzle , The welds connected to the shell belong to category D. 4.4.2 The type of welded joints of pressure vessels should comply with the requirements of GB985 and GB986 and design drawings. 4.5 Pressure test
4.5.1 After the pressure vessel is manufactured, a hydraulic pressure test should be carried out. The hydraulic test pressure P is 1.5 times the design pressure. 4.5.2 During the hydraulic test, the film stress of the pressure vessel shell should not exceed 90% of the service strength c of the material at the test temperature. And calculate according to formula (2)
where, -|| tt||=D+8.)
28.4
effective wall thickness of pressure vessel shell mm;
(2)
3
— Weld coefficient of pressure vessel shell.
4.6 Qualifications and Responsibilities of Design and Manufacturing Units JB/T6539-92
4.6.1 The design and manufacturing units of pressure vessels must have a sound quality assurance system, and the design unit shall have "Pressure Vessel Design Unit Approval", and the manufacturing unit should have a "Pressure Vessel Manufacturing License". 4.6.2 Design unit responsibilities
a.
b.
C.
The design unit shall be responsible for the accuracy and completeness of the design documents; the design documents of the pressure vessel shall at least include design calculations and design drawings: the general drawing shall be stamped with the approval letter of the pressure vessel design unit. 4.6.3 Responsibilities of the manufacturing unit
4.6.3.1 The manufacturing unit shall manufacture according to the design drawings. During the manufacturing process, various specific inspections and tests on pressure vessels shall be carried out in accordance with the provisions of this standard and drawings, an inspection report shall be submitted, and the manufacturer shall be responsible for the accuracy and completeness of the report.
4.6.3.2 The manufacturing unit should have the following relevant technical documents for pressure vessels of different specifications, and the technical documents should be kept for at least 5 years. a.
b.
c.
d.
e.
Main pressure component material certification:
General manufacturing process Card:
Welding procedure qualification report and general welding procedure regulations: welding records, inspection records and test reports; completion drawings.
4.6.3.3 After passing the inspection, the pressure vessel must fill in the product certificate and quality certificate. The product certificate should have the supervisory inspection seal of the pressure vessel supervisory inspection department.
5 Types and Basic Parameters
5.1 Types and Models
5.1.1
The gas tank model consists of pinyin letters and numbers: C
0 -0
Rated working pressure, MPa
Volume, L
Arrangement form, W represents horizontal and vertical gas storage tank code
5.1.2 Others The compilation of pressure vessel models shall be in accordance with relevant technical documents. 5.2 Pressure parameters
The rated working pressure of the pressure vessel is selected according to Table 3. Table 3
0. 25
.0.4
0.5
0.7
1.0
1. 25
5.3 Simplified Diameter
When the cylinder is rolled with steel plate, its nominal diameter is selected from Table 4. At this time, the nominal diameter refers to the inner diameter, 5.3.1
Table 4
150| |tt||5.3.2
4
200
250
300
350
400
450| |tt||500
MPa
1.4
mm
550
When steel pipe is used as the screen body, the simplified nominal diameter is selected according to GB8163. At this time, the simplified nominal diameter refers to the outer diameter of the steel pipe. 6 Materials
6.1 General requirements
JB/T6539-92
6.1.1 Steel plates and steel pipes used to manufacture pressure vessels should have a material certificate (or copy), manufacturing unit Acceptance shall be carried out according to the certificate. 6.1.2 The steel used for pressure components of pressure vessels shall comply with the provisions of this chapter. Substitution of other materials is allowed if their properties are not lower than those specified in this chapter.
6.1.3 The steel materials and corresponding welding materials listed in this chapter should also comply with the requirements of each corresponding standard. 6.2 Steel Plate
6.2.1
When carbon cord boiling steel plate and carbon killed steel plate are used to make pressure vessels, their applicable scope shall be as specified in Table 5. Table 5
Steel
No.
Q235-AF(A3F)
Q235A(A3)
Q235B
Q235C||tt| |6.2.2
Steel
Design pressure
MPa
≤0.6
≤1.2
1.6
≤2.5
Use mix
c
0~250
0~350
Steel grade, usage status and allowable stress of the steel plate for pressure vessels Table 6 specifies. Table 6
Thick
No.
Q235-A, F
(A3F)
Q235-A
(A3)|| tt||Q235-B
Q235-C
20HP
20g
20R
16MaR
Steel Plate Standard
GB912
GB3274
GB912
GB3274
GB912
GB3274||GB912
GB3274
GB6653| |tt||GB713
GB6654
GB5681
GB6654
Usage status
Carbon
Hot
Rolled|| tt||hot
hot
rolled
hot:
rolled
hot
hot
rolled||tt ||rolled
or normalized
low
hot
hot
rolled
rolled
or normalized| |tt||mm
Prime
Pot
3~4
4.56
3~4
4.5~16||tt ||3~4bzxz.net
4.5~16
3~4
4.5~16
3~5.5
6~16
Combined
Gold
4
Normal temperature strength index
MPa
Steel plate
375
390
400 | Steel
Plate
510
MPa
235
245
350
345
Max plate Thick
mm
12
16
20
32
Pressure vessel
Limited medium||tt| |Air
Allowable stress MPa20 at the following elevation (C)
133
100
113
125
130
170
150
132
200
105
105
116
120|| tt||123
5
pin
number
10
20
16Mn
6. 3. 2
Performance.
Steel pipe standards
GB8163
GB8163
GB6479
JB/T6539-92
Table?
Thickness
am
Carbon pot
10
≤10
Low
Combined
Gold
≤16
Normal wet strength index
a.
MPa
steel pipe
335
390|| tt||steel
steel
pipe
490
MPa
205
245
320||tt| |Allowable stress MPa≤20 at the following temperature (C)
112
100
130
163
150
108
200
101
123
159
Carbon steel and low alloy steel pipes for pressure vessels, pressure vessel manufacturing units should Take one bolt from each batch and recheck its mechanical bolts
6.4
The steel number and allowable stress of the bolts are as specified in Table 8. Table 8
Bolt specifications
Steel
No.
Q235A(A3, AY3)
35
30CrMoA
Welding Material
6.5
6.5.1
6. 5.2
steel
steel plate standard
GB700
GB699
GB3077
usage status
carbon
Hot
Milk
Positive
Fire
Paper
Quality
Tune
Recommended pressure vessel welding materials are shown in the table 9. mm
Primary
Steel
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