Steel pipe flanges, gaskets, fasteners matching regulations (American system)
HG20635--97
1 Subject content and scope of application
This standard is the regulations that should be followed when steel pipe flanges, gaskets, fasteners (American system) are used together. This standard is applicable to steel pipe flanges, gaskets and fasteners specified in HG20615~HG20634, 505
HG 20615
HG20624
HG20625
HG20627-~20633
HG20634
Reference standards
"Steel pipe flange types, parameters (American system)" & "Steel pipe flange technical conditions (American system)" "Steel pipe flange temperature and pressure level (American system)" "Steel pipe flange gasket (American system)" "Steel pipe flange fasteners (American system)" 3 Pipe flanges
Flange types should comply with the provisions of HG20615. 3. 0. 1
3.0.2 The sealing surface type of the flange is generally selected according to the provisions of Appendix A of HG20615. The nominal pressure and operating temperature range of the flange material shall comply with the provisions of HG20624. 3.0.3
The maximum non-impact working pressure of the flange at different temperatures shall comply with the provisions of HG20625. 3. 0.4
3.0.5 The loose sleeve flange with welded ring shall not be used in severe cyclic operating conditions. 3. 0. 6
The use restrictions of threaded flanges are the same as those of threaded joints in piping projects. 507
4 Gaskets
The scope of application of gaskets shall comply with the provisions of HFG.20627~HG20633, 4.0.
4.0.2 According to the working temperature, pressure, corrosiveness and toxicity of the medium, flammability, allowable leakage process and other factors, the type of gasket to be used.
5 Fasteners
5.0. 1 The scope of application of fasteners is based on FG 20634. 5.0.2 For high temperature, the selection of fasteners should consider the influence of bolt load and stress test pool on the sealing performance of joints. 509
Gasket type
Rubber gasket
Asbestos rubber sheet gasket
Synthetic fiber rubber gasket
Polytetrafluoroethylene sheet
(modified or filled)
Non-corroded graphite composite gasket
Polytetrafluoroethylene
Tangled gasket
Metal jacketed gasket
Tooth combination
Metal ring gasket
Use pressure PN
2. 0~-5. 0
2. t. 5. 0
?. 0--11. t
2.0-~.26. 0
5. 0~-15. 0
5.0.-.13.0
1..:--12.0
Buddha seal type
: raised surface. Remaining plane
, raised front, upright front
Paibonan. Gold plane
Ziheng, Dan convex surface,
Taipei surface empty plane
Zi surface, Zhouchushi,
Mixed floor surface
Cai Shang, West surface,
"raised surface
Ring connection painting
Sealing surface wheat surface roughness
Secret teaching waterline or
RaG.3~12.5
Secret grain waterline or
R36. 3--12.5
Dense grain line or
Ra6. 3--12. 5
Dense grain waterline or
RaG.3--12.n
Dense waterline or
Ra6. 9~- 12. 3
Dense effect waterline blowing
Ra6. 3.-~12. 5
Ra3. 2-~6. 3
Kal.63.2 period）
Ra0. 8 ~- :, 6 71 Rust
Rr3.2.5.3
Ra, 8~1. 6、
Name
Flange, gasket, and hardware selection table
Flange type
Various types
Various types
Various types
Various types
Various types
Core flange
Smart neck flange
Sugar belt
Steam welding
Loose sleeve flange
Point
Preparation and consultation
Polymer
Mechanical device
Belt neck flat flange Pig flange
Simple collar explosion cover
Yi body method
Socket welding flange
With pre-welding flange
Integral manufacturing
Socket welding full cover
The maximum use temperature of the whole piece is C
650(450)
150(200)
Note: the concave modification surface is only used for FPN including 5.0MPa (Clas9300) 1N1~00mm integral flange, neck butt welding method sheep, neck welding flange bearing welding ③ The temperature of the fasteners listed in the table refers to the metal exhaustion temperature of the fasteners ③ The bolts and screw materials listed in the table The temperature range lower than the table temperature is guaranteed (not less than 1.20℃), but it is not allowed to be used in the temperature range higher than the table temperature. Except for 3M0A, the lower limit of use temperature is 20℃, 35℃. When the use temperature is lower than 20℃, the low-temperature summer impact test should be carried out. The use temperature range of various natural rubbers and image forming rubbers is not commercially available, and the translation range is HG?06?7.@Solid rubber cavity general health MPa
Fastener type
Hexagonal bolt
Double solid burst column
Burst pattern column
Fish butterfly teaching
Double butterfly column
Full thread entertainment| |tt||Six explosion-proof bolts
Double-headed coal pot
Full threaded operation column
Six chrysanthemum screw control
Full teaching screw finger
Six brother butterfly removal
Set practical operation format
Full screw production
[Hexagonal bolts
Double-headed screw spots
Holy Xin effect screw Bin
Double-headed screw cake
Full threaded screw buds
Double-headed support
Full threaded studs
Double real screw support
Full threaded screw materials
Double-headed screw station
Full threaded studs
Remove the raw and flange.
35CrMaA
25CrEMOVA
Purple firmware performance grade material
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25Cr2MuVA
35CrMoA
25C12MuVA
35CrMoA
25C:2MDVA
35CrMoA
25Cr2M0VA
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Experience, active use viscosity -10 yuan
35CrMoA
25Cr2MoVA
35CrMoA
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35CrM0A
23Cr210VA
35CrMA
25Cr2MoVA
13SCrMoA
2Cr2MuVA
35CrMoA
25Cr2MoVA
3$CrMaA
25Cr2MaVA
550℃
25Cr2MoVA
25Cr2MoVA
25Cr2MoVA
25Cr2MoVA
Matching of pipe flanges, gaskets and fasteners 6.0.! The matching of ferritic steel pipe flanges, gaskets and fasteners shall be in accordance with the provisions of Table 6.0.1. When installing the flange, control the torque to prevent over-tightening. 6.0.2 Full-plane flanges should use non-metallic gaskets such as rubber, asbestos rubber sheet, synthetic fiber rubber pressed sheet, modified or filled polytetrafluoroethylene.
6.0.3 When using non-metallic flat gaskets, polytetrafluoroethylene coated gaskets, flexible stone ring composite gaskets and other soft gaskets, the raised face flange can be machined with a waterline. In addition, 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 Fasteners for austenitic stainless steel flanges should be made of materials with similar linear expansion coefficients. 2 General austenitic stainless steel fasteners that have not been hardened by cold working are only suitable for non-metallic gaskets, polytetrafluoroethylene gaskets and flexible graphite composite gaskets.
3 When the operating humidity is not greater than 230C, ferritic steel (magnetic or gold-containing structural steel) fasteners can be used. When 65PN2.MPa (Clas130) steel flanges and cast iron flanges are matched, the sealing surface should be a full plane, and the gasket material is limited to non-metallic flat gaskets. When the steel flange of PV5.CMPa (Class300) is matched with the iron flange, the sealing surface can be a solid surface, and the material of the potential piece is limited to flat gaskets.
Additional Notes: The unit proposing, the editor-in-chief and the main drafter of this standard Proposing unit: Chemical Process Piping Design Technology Center Station of the Ministry of Chemical Industry Equipment Design Technology Center Station of the Ministry of Chemical Industry
Editor-in-chief: Equipment Design Technology Center Station of the Ministry of Chemical Industry Main drafter: Ying Daoyan Yu Jun
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