Some standard content:
JB87011998
This standard was first issued on March 19, 1998.
Appendix A and Appendix B of this standard are standard appendices, and Appendix C, Appendix D and Appendix E are indicative appendices. This standard is proposed and managed by the Technical Committee for Standardization of Refrigeration Equipment of the Ministry of Machinery Industry. The responsible drafting units of this standard are: Jiangyin Alfa Laval Plate Heat Exchanger Co., Ltd., and Hefei General Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are: Chen Yongdong, He Liyong, Ren Jinlu, Song Zhaohuang, and Li Zhi. 149
1 Scope
Machinery Industry Standard of the People's Republic of China
Plate heat exchanger for refrigeration
Plate heat exchanger for refrigerationJB 8701-1998
This standard specifies the design, manufacture, inspection and acceptance of plate heat exchangers for refrigeration devices (including semi-welded plate heat exchangers, fully welded plate heat exchangers, copper brazed plate heat exchangers, nickel pin-welded plate heat exchangers, hereinafter referred to as plate heat exchangers). This standard applies to plate heat exchangers (such as condensers, evaporators, precoolers, subcoolers, oil coolers, etc.) that are in contact with refrigerant and bear the refrigerant pressure in refrigeration devices with liquefied gas as refrigerant, design pressure not higher than 4.0MPa, design temperature of 0~～200℃ (minimum evaporation temperature-70℃; for austenitic stainless steel pin-welded plate heat exchangers, the minimum design temperature should be higher than or equal to -196℃). This standard does not apply to detachable plate heat exchangers, plate pack thickness less than 150mm or non-detachable plate heat exchangers with a total volume of channels on both sides less than 0.025m.
This standard also applies to the design, manufacture, inspection and acceptance of non-detachable plate heat exchangers used in other occasions with similar pressure, temperature, medium and other conditions.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest version of the following standards GB150-89 Steel Pressure Vessels
GB528.--82
Determination of Tensile Properties of Vulcanized Rubber
GB 699---88 1
Technical Conditions for High-quality Carbon Structural Steel
GB700--88 Carbon Structural Steel
GIB/T983—1995 Stainless Steel Welding Rods
Technical Conditions for Alloy Structural Steel
GB 3077---88
GB 327188
Carbon Structural Steel and Low-alloy Structural Steel Hot-rolled Thick Plates and Strips GB/T3280--92 Stainless Steel Cold-rolled Plates
GB3621--83 Titanium and Titanium Alloy Plates
GB 3624—83
GB 3625--83
Titanium and titanium alloy seamless tubes
Seamless titanium tubes for heat exchangers and condensers
GB/T423792Stainless steel hot-rolled steel plates
GB/T 5117
1995Carbon steel welding rods
GB 5187-85
Pure copper foil
GB 5190-- 85
GB 5721-- 85
GB5722-- 85
GB 6031--.: 85
Nickel and white copper foil
General provisions for marking, packaging and transportation of rubber sealing productsGeneral provisions for storage of rubber products
Determination of international hardness of vulcanized rubber (routine test method)GB 6654--1995
Carbon steel and low alloy steel thick plates for pressure vesselsApproved by the Ministry of Machinery Industry of the People's Republic of China on March 19, 1998150
Implemented on July 1, 1998
JB 8701-1998
GB 7759—87
Determination of permanent deformation of vulcanized rubber under constant deformation compression at room and high temperaturesGB 7778--87
GB 8163—87
GB 9237--88
GB13296-
GB/T 14845-
Refrigerant numbering method
Seamless steel pipe for conveying fluid
General technical specification for refrigeration equipment
Stainless steel seamless pipe for boiler and heat exchanger-93
GB/T 14976-
GB 16409—1996
JB 2536——80
JB 4708---92
JB4726—94
JB 4727—94
JB 4728—94
JB 4730—94
Titanium plate for plate heat exchanger
Seamless stainless steel pipe for fluid transportation
Plate heat exchanger
Painting, packaging, transportation of pressure vessels
Qualification of welding procedures for steel pressure vessels
Carbon steel and low alloy steel forgings for pressure vesselsCarbon steel and low alloy steel forgings for low-temperature pressure vesselsStainless steel forgings for pressure vessels
Nondestructive testing of pressure vessels
JB6917—1998Pressure vessels for refrigeration equipment3 Definitions
This standard adopts the following definitions.
3.1 Semi-welded plate heat exchangersemiwelded plate heat exchangerUsing a special welding process (laser welding, plasma arc welding, argon shielded arc welding) to weld every two plates together along the outer sealing groove to form a plate pair, and then assemble the plate pairs with gaskets (as shown in Figure 1). Gasket
3.2 All-welded plate heat exchanger weld
After a certain number of plates are welded into a plate package along the sealing groove using a special welding process, several plate packages are welded and assembled into an integrated plate heat exchanger (as shown in Figure 2). 151
JB8701—1998
3.3 Copper brazed plate heat exchanger copperbrazed heat exchanger stainless steel plates and copper foil brazing material with a purity higher than 99% form an integrated plate heat exchanger under the high temperature of a vacuum needle welding furnace, and also includes a copper brazed plate heat exchanger plated with a protective layer to prevent corrosion by refrigerants such as ammonia (as shown in Figure 3). Figure 3
3.4 Nickel brazed plate heat exchanger nickel brazed heat exchanger stainless steel plates and nickel foil brazing material form an integrated plate heat exchanger under the high temperature of a brazing furnace (as shown in Figure 3). 3.5 Working pressure operation pressure The highest pressure that may occur on any side of the plate channel of the heat exchanger under normal operation. 3.6 Design pressure design pressure
When designing a plate heat exchanger, the pressure used to determine the calculated thickness or mechanical strength of each pressure-bearing component. 4 General provisions
4.1 Basic requirements
In addition to complying with the provisions of this standard, the design, manufacture, inspection and acceptance of plate heat exchangers shall also comply with JB6917 and the technical requirements of the drawings.
4.2 Design and manufacturing qualifications
JB 8701--1998
4.2.1 The design and manufacturing units of plate heat exchangers must have a sound quality management system. The design unit shall hold a pressure vessel design unit approval letter, and the manufacturing unit shall hold a pressure vessel manufacturing license. 4.2.2 The manufacture of plate heat exchangers must be placed under the supervision of a safety supervision agency or an authorized inspection agency. Note: An authorized inspection agency refers to an agency authorized by the national pressure vessel safety supervision agency to conduct supervision and inspection. 4.3 Scope of plate heat exchanger pressure components Plate heat exchanger pressure components are the pressure-bearing parts of the plate heat exchanger body and the connecting body (including the clamping plate, vertebral frame plate, clamping studs, round flat cover of the observation hole and the connecting pipe with a diameter of not less than 250mm of semi-welded and fully welded plate heat exchangers), and are specified within the following scope: a) The first circumferential weld between the heat exchanger connecting pipe and the external pipe; b) The first threaded joint of the threaded connection; c) The first flange sealing surface of the flange connection; d) The first sealing surface of the special connector or component connection. 4.4 Refrigerant types and refrigerant related thermal properties data The refrigerant numbers applicable to plate heat exchangers and the saturated vapor pressure at the corresponding temperature are shown in Table 1. 4.5 Safety of refrigerants
In addition to grouping according to GB9237, the safety of refrigerants shall also comply with the provisions of this standard, as shown in Table 2. Table 1 Commonly used refrigerants and saturated vapor pressure at corresponding temperatures Refrigerant composition Prefix name (non-standard naming symbol) 1) Refrigerant number
(Named according to GB7778)
Refrigerant name
R32 and R125
Non-azeotropic mixture
R32R125, R134a non-azeotropic mixture
R22 and R115 azeotropic mixture2)
Difluoromonochloromethane\)
R12 and R152a azeotropic mixture2
Tetrafluoroethane
Difluorodichloromethane2
1,1-Difluoroethane Alkane
Isobutane (dimethylpropane)
Octafluorocyclobutane
Tetrafluorodifluoroethane2)
·Dichlorofluoromethane")
High pressure side
Condensation temperature
Low pressure side
Specified ambient temperature
Refrigerant component prefix name (non-standard naming symbol)1) Refrigerant number
(Named according to GB7778 regulations)
Refrigerant name
Monochlorotrifluoromethane2
Trichlorodifluoroethane3)
Trichlorotrifluoroethane2)
Other refrigerants
JB 8701—1998
Table 1 (end)
High pressure side
Condensation temperature
Equivalent to the saturated vapor pressure at each reference condensation temperature, but the minimum value is 0.10MPa (for example: water R718)1) List the prefix names of the refrigerant components, qualitatively indicating their impact on the ozone layer. 2) Restricted and replaced refrigerants.
3) Transitional refrigerants.
Table 2 Safety grouping table of commonly used refrigerants
Low toxicity A
No Flammable
R11, R12, R22, R113, R114, R115, R134a, RC318, R407A, R407B/C, R410A/B.R500, R502, R718 (water) and other refrigerants
R142b, R152a and other refrigerants)
R290, R600.R600a and other refrigerants
CH;CCIF21-chloro-1,1-dichloroethane.
1) R142b
CH, CHCI vinyl chloride.
2)R1140
5 Materials
Low pressure side
Specified ambient temperature
Equivalent to saturated vapor pressure at temperature
38C
High toxicity B
R21.R123 and other refrigerants
R717 (ammonia) and other refrigerants
R1140 (vinyl chloride) and other refrigerants 2)
5.1 The materials of plate heat exchanger plates and main pressure components shall be selected according to Table 3, among which the allowable stress of main pressure components at different temperatures shall be selected according to Table 4; the materials of other non-pressure components shall be selected according to Table 5 in GB16409--1996. 5.2 When materials other than those listed in Table 3 are used, their mechanical properties shall not be lower than those specified in Table 3 for materials with similar composition and technical requirements of drawings. Welding materials for plate heat exchangers shall comply with the requirements of GB/T983 or GB/T5117. 5.3
Main component names
Material grade or material name
1Cr18Ni9
OCr18Ni9
00Cr19Ni11
0Cr17Ni12M02
00Cr17Ni14M02
GB3280
Material standard
GB/T 14845
Main component names
Clamping plate
Frame plate
Clamping stud
Q235-A
Q235-B
JB 8701--1998
Table 3 (end)
Material brand or material name
1Cr18Ni9
OCr19Ni9
0Ct17Ni12M02
Etc. coating
10, 20
OCr18Nig
0Cr18Ni10Ti
OCr17Ni12Mo2
00Cr17Ni14Mo2
1Cr18Ni9Ti
Q235-A
Q235-B
20.35~16Mm
OCr18Ni1 0Ti
OCr18Ni9
OCr17Ni12M02
00Cr17Ni14Mo2
TA1,TA2
20D.16MnD
Q235-A
35、45
35CrMoA
Nitrile rubber
Chloroprene rubber
EPDM rubber
N2、N4
BZn15-20
GB6654
GB3274
GB3280
GB8163
Material standard
GB 13296 or GB/T 14976
GB13296
GB3624 or GB3625
JB4726
GB 4237 or JB 4728
GB3621
JB4727
GB3077
Appendix A (Appendix to the standard)
GB 5187
GB5190
Pressure plate
Frame plate
Material grade
Q235-A
Q235-B
OCr18Ni9
0Cr18Ni10Ti
0Cr17Ni12Mo2
Q0Cr17Ni14Mo2
oCr18Ni9
0Cr18Ni10Ti
OCr17Ni12Mo2
00Cr17Ni14M02
JB 8701-1998
Allowable stress and room temperature strength of main pressure component materials at different temperatures
Material standards
GB3274
GB3274
GB6654
GB4237
GB4237
GB4237
GB4237
GB3621
GB3621
JB4726
JB4726
JB4726
JB4726bzxZ.net
JB4727
JB4727
GB8163
GB8163
GB/T 14976
GB/T 14976
GB/T 14976
GB/T 14976
GB3624
GB 1～100
≥100～300
Allowable stress at the following temperatures (℃) MPa
Material grade
Q235-A
35CrMoA
Material standard
GB 700
GB 3077
GB3077
JB 8701—1998
Table 4 (End)
Note: The allowable stress values at intermediate temperatures can be obtained by interpolation. 6 Design
Normal temperature strength
M24~M48
M24~M48
≤M22
M24~M48
M24~M48
≥M52
M24~M48
≥M52
Allowable stress at the following temperature (C)
This chapter is applicable to semi-welded plate heat exchangers and fully welded plate heat exchangers. The design of brazed plate heat exchangers adopts the burst test verification method. The burst test of brazed plate heat exchangers is shown in Appendix B (Appendix of the standard). 6.1 Clamping studs
6.1.1 Symbol
- The minimum total cross-sectional area of the clamping studs required in the pre-tightened state is calculated based on the thread minor diameter or the minimum diameter of the unthreaded part, whichever is smaller, mm;
The total cross-sectional area of the clamping studs actually used is calculated based on the thread minor diameter or the minimum diameter of the unthreaded part, whichever is smaller, A
, mm2
Am The total cross-sectional area of the clamping studs required, mm;- The minimum total cross-sectional area of the clamping studs required in the working state is calculated based on the thread minor diameter or the minimum diameter of the unthreaded part, A,
, whichever is smaller, mm2;
The projected area of the plate enclosed by the center line of the sealing groove, mm;B Effective sealing width of the gasket, mm;
F. —Fluid static pressure acting on a2, N; F, —Minimum gasket clamping force required under working condition, N; 1 —Expanded length of gasket centerline, mm; m
Gasket coefficient, rubber: m=1.0 (semi-welded plate heat exchanger); m=0 (fully welded plate heat exchanger); Number of clamping studs;
pDesign pressure, MPa;
W…Minimum clamping stud load required under preload condition (i.e., minimum gasket clamping force required under preload condition), NW. ”…Minimum clamping stud load required under working condition, N; 157
WStud design load, N;
JB 8701--1998
y--gasket specific pressure, rubber: y-1.4MPa (semi-welded plate heat exchanger); y=0 (fully welded plate heat exchanger); [a--allowable stress of clamping stud material at room temperature (see Table 4), MPa; [o]. Allowable stress of clamping stud material at design temperature (see Table 4, MPa. 6.1.2 Clamping stud load
a) The minimum clamping stud load W required in the pre-tightened state. Calculated according to formula (1): W.=iBy
b) The minimum clamping stud load W required in the working state. Calculated according to formula (2): W. -F.+F.
Where; F. -azp
Fp=21Bmp|| tt||c) The effective sealing width B of the gasket should be the maximum width of the gasket. 6.1.3 Clamping stud area
a) The minimum total cross-sectional area A of the clamping studs required in the pre-tightening state. Calculated according to formula (3): W.
b) The minimum total cross-sectional area A of the clamping studs required in the working state, calculated according to formula (4): W
c) The required clamping stud area Am is taken as the larger value of A and Ap; d) The actual total cross-sectional area A of the clamping studs should not be less than the required total cross-sectional area Am of the clamping studs. 6.1.4 The minimum diameter of the clamping studs is calculated according to formula (5): d
6.1.5 Design load of clamping studs
a) The design load of the studs in the pre-tightening state is calculated according to formula (6): W An±A ×[o.
b) The design load of the stud under working condition is calculated according to formula (7): W=Wp
6.2 Frame plate and clamping plate
6.2.1 Explanation of symbols
Gasket span in the width direction of the frame plate or clamping plate, mm; b
Equivalent span of the gasket in the length direction of the frame plate or clamping plate (b=a2/a), mm, diameter of the pipe hole on the frame plate or clamping plate, mm; stud span in the width direction of the frame plate or clamping plate, mm; width of the frame plate or clamping plate, mm;
Structural characteristic coefficient under preload condition;
Structural characteristic coefficient under working condition;
Circumference of the line connecting the centers of the clamping studs, mm; Minimum distance between the pipe holes on the frame plate or clamping plate, mm; i
Design pressure, MPa;
Distance from the center of the stud to the gasket The distance from the center line of the clamping force of the sheet, mm; ..(1)
（3）
·（4）
.（5）
JB8701—1998
The maximum allowable stress in actual use at room temperature, MPa; The maximum allowable stress in actual use at design temperature, MPa; W The design load of the stud under preload or working state, N; Z
Shape coefficient of frame plate or clamping plate, Z=3.4-2.4X The calculated thickness of the non-porous plate under preload state, mm; The calculated thickness of the non-porous plate under working state, mm; The calculated thickness of the non-porous plate, mm;
The calculated thickness of the perforated plate, mm;
,月2≤2.5
The allowable stress of the frame plate or clamping plate material at design temperature, MPa; The allowable stress of the frame plate or clamping plate material at room temperature, MPa. 6.2.2 When the frame plate or the clamping plate is actually used, it is subjected to both primary membrane stress and bending stress. Therefore, the maximum allowable stress in actual use is calculated according to formula (8) and formula (9): b) The maximum allowable stress in actual use of the frame plate and the clamping plate material at room temperature: S. = 1. 5[a]
b) The maximum allowable stress actually used for the frame plate and the clamping plate material at the design temperature: S, = 1. 5[]t
6.2.3 Calculation of the thickness of the non-porous plate
a) The structural characteristic coefficient K under the pre-tightening state is calculated according to formula (10): K; = 6WSc
b) The calculated thickness of the non-porous plate under the pre-tightening state is calculated according to formula (11): =α×
c) The structural characteristic coefficient K under the working state is calculated according to formula (12): Kz = 0. 3Z + 6WSc
d) The calculated thickness of the non-porous plate under the working state is calculated according to formula (13): Kep
e) The calculated thickness of the non-porous plate is taken as the larger value. 6.2.4 Calculation of plate thickness with holes
（8）
（9）
·（10）
（12）
·（13)
6.2.4.1 When the openings of the frame plate and the clamping plate are located in the center, the plate thickness calculation should take into account the reinforcement coefficient C1, C, calculated according to formula (14): G=
（14）
6.2.4.2 In actual situations, the openings of the frame plate and the clamping plate are located at the four corners. When calculating their thickness, a reduction coefficient C2 should be considered while considering the reinforcement coefficient. C2 is calculated according to formula (15): C,
6.2.4.3 The plate thickness of the plate with holes is calculated according to formula (16): CiC2op
6.3 Observation port circular flat cover
6.3.1 Explanation of symbols
·（15）
·（16）
JB87011998
Calculated diameter of circular flat cover of observation port, mm; structural characteristic coefficient;
Design pressure, MPa;
Radial distance from the center of the observation port stud to the center line of the gasket clamping force, mm; SG-
Design load of the stud during preload or operation, calculated according to 7.5.2.4 of GB150-89, N; allowable stress of the flat cover material at design temperature, MPa; allowable stress of the flat cover material at room temperature, MPa; calculated thickness of circular flat cover, mm.
6.3.2 Determination of structural characteristic coefficient and thickness of flat cover a) For the flat cover shown in Figure 4, K=0.25, and the thickness of the flat cover is calculated according to formula (17): D. ×
（17）
b) For the flat cover shown in Figure 5, the structural characteristic coefficient K is calculated according to formula (18) and formula (19), and the thickness of the flat cover is calculated according to formula (17). The larger value of the thickness of the flat cover in the pre-tightened state and the working state is taken: Pre-tightened state:
Working state:
K-1.78WSc
（18）
（19）
6.4 This standard allows the use of finite element analysis methods for the design of pressure components, but it must be evaluated and approved by the Ministry of Machinery's Refrigeration Equipment Standardization Technical Committee.
7 Manufacturing, inspection and acceptance
7.1 Processing
7.1.1 The plate surface should not have pits, scratches, indentations and other defects that exceed the negative deviation of the plate thickness, and all punching burrs should be removed. 7.1.2 The plate should not have damaging deformation.
7.1.3 The plate is not allowed to have micro cracks.
7.1.4 The deviation of the plate corrugation depth and the sealing groove depth should not be greater than the specified value in Table 5. 160
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