This standard is the regulations that should be followed when steel pipe flanges, gaskets, and fasteners (European system) are used together. HG 20614-1997 Steel pipe flanges, gaskets, and fasteners selection regulations (European system) HG20614-1997 standard download decompression password: www.bzxz.net

Steel pipe flange, gasket, fastener matching regulations (European system)
HG20614-97
1 Subject content and scope of application
This standard is the regulations that should be followed when steel pipe flanges, gaskets, fasteners (European system) are used together. This standard applies to steel pipe flanges, gaskets and fasteners specified in HG20592~HG20613. 271
HIG 20592
HG20603
HG20604
HG2060620612
HG20613
2“Reference Standards
“Types and Parameters of Steel Pipe Flanges (European System)” & Technical Conditions of Steel Pipe Flanges (European System)” “Temperature and Pressure Levels of Steel Pipe Flanges (European System)” “Gaskets for Steel Pipe Flanges (European System)” “Fasteners for Steel Pipe Flanges (European System)” 3 Pipe Flanges
3.0.1 The flange type shall comply with the provisions of HG20592. 3.0.2 The sealing surface type of the flange shall generally be selected in accordance with the provisions of Appendix A of HC20592. 3.0.3 The nominal pressure and operating temperature range of the flange material shall comply with the provisions of HG20603. 3.0.4 The maximum non-impact working pressure of flanges at different temperatures shall comply with the provisions of HG20604. 3.0.5 The maximum operating temperature of plate-type flat-welded flanges, butt-welded loose-fit flanges and flat-welded loose-fit flanges is 300°C, and they should not be used in strong cyclic operating conditions. The use restrictions of threaded flanges are the same as those of threaded joints in piping projects. 273
4 Gaskets
The scope of application of gaskets shall comply with the provisions of HG20606~HG20612. 4.0. 1
4.0.2 The type of gasket shall be selected based on the working temperature, pressure, corrosiveness and toxicity of the medium, flammability, allowable leakage and other factors.
Fasteners
The scope of application of fasteners shall comply with the provisions of HG20613. 5 0. 1
5..2 At high temperatures, the selection of fasteners shall consider the influence of bolt load and stress relaxation on the sealing performance of the joint. 275
6 Coordination of pipe flanges, gaskets and fasteners 6.0.1 The coordination of ferritic steel pipe flanges, gaskets and fasteners shall be in accordance with the provisions of Table 6.0.1 under the premise of complying with Chapters 3.4 and 5 of this standard.
When installing the flange, the torque should be controlled to prevent over-tightening. 6.0.2 Non-metallic flat gaskets such as rubber, asbestos rubber sheet, synthetic fiber rubber pressed sheet, modified or filled polytetrafluoroethylene shall be used for full-face flanges.
6.3 When using non-metallic flat gaskets, polytetrafluoroethylene coated gaskets, mulberry graphite composite gaskets and other soft gaskets, the raised face flange shall not be machined with a waterline: otherwise, the flange sealing surface shall not be machined with a waterline. 6.0.4 When using austenitic stainless steel flanges, the following provisions shall be met. (1) Austenitic stainless steel flanges are used for fastening. It uses materials with similar linear expansion coefficients. (2) Ordinary austenitic stainless steel fasteners that have not been hardened by cold working are only suitable for non-metallic flat gaskets, polytetrafluoroethylene coated gaskets and flexible graphite composite gaskets.
(3) When the working temperature is not more than 230℃, ferritic steel (carbon steel or alloy structural steel) fasteners can be used. Additional Notes: This standard proposer, editor and main drafter Proposer: Equipment Design and Technology Center of the Ministry of Chemical Industry Chemical Process Equipment Design and Technology Center of the Ministry of Chemical Industry Editor: Equipment Design and Technology Center of the Ministry of Chemical Industry Main drafter: Ying Daoyan Zunjun
Gasket type
Rubber gasket (()
Asbestos rubber gasket (0)
Composite glass fiber rubber separation sheet
Tetrafluoroethylene sheet
(modified or filled)
Composite gasket
Tight tetrachloroethylene coated gasket
Winding gasket
Metal wrapped gasket
Toothed combination gasket
Gold cat ring gasket
Usage pressure PN
1. 0~-6. 3
0. 6-~ 4. 0
. 6--15. 0
2.5--10.0
1. 6-~25. 0
6. 3-~ 25. 0
Sealing surface type (4D)bZxz.net
Raised face,
Bar face, full plane
Raised face, face
Wall pick face, full plane
Raised face, single convex face
Row wall face, full plane
Raised face, concave-convex face,
Bridge sugar face, full plane
Inflammation face, concave-convex face,
Raised face, concave-convex face,
Groove face
Raised face, concave-convex face
Ring counter-joint surface
Sealing surface surface roughness
Dense waterline or Ra6.3~12.5
Dense waterline or RaG.3~12.5
Dense waterline or Ra6.3~12.5
Dense waterline or Ra5.3-~12.
Dense waterline or Ra6.3~12.5
Ra3. 2~~6. 3
Ral.6~3.2(carbon steel)
Ra0.8~1.6(stainless steel）
Rz3. 2 6. 3
Table 6.0.1 Flange
Flange type
Various types
Various types
Various types
Derivative types
Neck flat welding flange
Hunter neck butt welding flange
Metallic flange
Permanent flange
Butt welding ring loose inspection method
Lead butt welding method single
Integral method
Flange cover
Lead butt welding flange
Integral method
Flange cover
Ra0.8-~1.6 (carbon clamp, chrome steel
Ra0.4~C.8 (stainless steel Steel)
Comb neck butt welding flange
Purple body
Encapsulated flange
Note: ①Concave and convex surface, sample groove surface instrument is used for PN1.0~16.0MPa, DN10-600mm integral flange, collar butt welding flange, with flat welding method ②The use temperature of the fasteners listed in the table refers to the metal temperature of the fasteners ③The bolts and studs listed in the table can be used in a temperature range lower than the temperature listed in the table (not less than -20°C), but should not be used in humidity higher than the table ④The fastener materials listed in the table, except for 35CrMoA, the lower limit of the use temperature is -20°C, 35CrMoA should be used when the temperature is lower than 1: -20°C 1 Various rubbers and combined rubbers have different use temperature ranges, see HG20606 for details. ?The P·≤650MPa·of cotton rubber sheet,
Heat sheet, fastener selection table
! Working temperature, ℃
G50(450)
150(200)
Fixture type
Six-head bolt
Stud stud
Full thread stud
Hexagon bolt
Stud stud
Full thread stud
Hexagon bolt
Stud stud
Full butterfly stud
Hexagon stud
Effective head stud
Full thread stud
Hexagon bolt
Double solid stud
Full thread stud
t||Stud
Full thread stud
Stud
Full thread stud
Stud
Full thread stud
Stud
Full thread stud
35CrMoA
25Ct2MeVA
Fastener performance grade or material brand-number 3.250℃
25Cr2MoFA!
35CrMoA
25C12MoVAl
35CrMoA
25Cr2MoVA
35CrMA
25Cr2MoVA.
35CrMaA
25Cr2MoVA
flange, bearing flange, flat welding ring loose sleeve method, natural flange and lining method "cover. High temperature range,
low temperature specific impulse test. Minimum use temperature · 1G0 ℃. sonc
35CrMoA
25Cr2MoVA
35CrMoA
25Cr2MoVA
35CrMoA
25Cr2MoVA
25Cr?MVA
35CrMaA
256-2MoVA
33 C-MnA
25C:2McVA
35CrMoA
23Cr2MoVA
35CrMoA
20Cr2MVA
25Cr2MoVA
2RC12M0VA
SCr2M0VA
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