HG 20622-1997 Steel Pipe Flange Cover (American System) HG20622-1997 Standard download decompression password: www.bzxz.net

Steel pipe flange cover
(American system)
HG 20622-97
Subject content and scope of application
This standard specifies the type, size, technical requirements and relevant provisions of steel pipe flange cover (American system). This standard applies to steel pipe flange cover with nominal pressure PN2.0MPa (Class150)~42.0MPa (Class2500)369
1IG20615
HG 20624
H 20625
HG 20634
HG 23635
Referenced standards
"Types and parameters of steel pipe flanges (American system)" "Technical conditions for steel pipes (American system)" "Steel pipe flange specifications - temperature grades (American system)" "Fasteners for steel pipe flanges (American system)" "Selection regulations for steel pipe flanges, gaskets and fasteners (American system)" 3 Types and scope of application of flange cover sealing surface
3.0.1 The sealing surface types of flange covers include raised face (RF), concave and convex face (MFM), groove (TG), full flat face (FF) and ring reverse joint (RJ). The size and selection shall be in accordance with the provisions of Chapter 6 and Chapter 8 of HG20615. When FN5.0MPa (ClaSs300), the height f of the raised face full flange cover is included in the flange thickness C: when PN11.OMPa (Class600), the height f of the raised face flange cover is included in the flange thickness C. The height of the boss of the flange cover with four convex faces and grooves is not included in the flange thickness C. The height of the boss E of the flange cover with the ring joint surface is not included in the flange thickness C. 3.0.2 The applicable pressure and diameter ranges of flange covers of various sealing surface types shall be in accordance with the provisions of Table 3.0.2 Table 3.0.2 Applicable range
Sealing surface type
Sinus surface (RF)
Concave and convex surface (MFM)
Groove surface (TG)
Flat surface (FF)
Ring joint surface (RJ)
(Class 150))
DN15-~·600
DN25~-600
(Class 3)
Nominal pressure PNMPatClass)
(Class 6G0)
DN15-~600
(Cless900>(class1s[ho)
DN15-600
DN15~·600
DN15~600
(Clas5 2500)
DN15~300
DN15-~300
DN15~-300
15-~300
Flange cover dimensions
The dimensions of the flange difference shall be in accordance with the provisions of Figures 4-1 and 4-1~6, Table 41PN2.(MPa(Class I50)Steel pipe filter flange cover Table 4--2PN5.0MIa(CIas 300)Steel pipe flange gain Table 4-3PN1I.CMPa(Cass 600) Steel pipe flange cover 44PN15.0MPa(Class 900) Steel pipe flange cover Table 4-5PN26. MPa(Clas 1500) Steel pipe flange cover 46PN42.0MI(Ch2500) Steel pipe flange cover 372
Full plane
Figure 4-1
PN≤5.0MPa
Ring joint (RJ)
Steel pipe flange, etc.: BI.
Nominal diameter
Nominal diameter
PN2.0MPa（CIas150) Steel yellow flange cover connection size
Flange cover
Bolt holewww.bzxz.net
Center diameter
Bolt hole
Screw inspection hole
Table 4 2 PNs. (MPa(Clas 300) Pipe flange connection size
Screw hole
Center diameter
Bolt hole
Flange cover
Flange cover
Flange cover
Theoretical weight
Flange cover
Theoretical weight
Nominal diameter
Nominal diameter
Table 4-3
PN11.0MPa (C1uss600) Steel pipe flange connection size
Flange cover
Bolt hole
Center circle straight line
Bolt hole
Bolt hole
Table 4-4 PN15. 0MPa (C1uss 900) Steel pipe flange connection size
Flange
Bolter hole center circle diameter
Butterfly bolt hole
M36×3
Flange cover
Flange cover
Flange cover
Theoretical weight
Flange cover
Theoretical weight
Nominal diameter
Nominal diameter
Table 4- 5
Flange flag
Table 4—6
Flange cover
PN26.0MPa(Clas1500)Steel first flange cover connection dimensions
Bolt hole center
Center diameter
Bolt hole
Bolt hole
M56×3
PN42.0MPA(Class2500)Steel pipe flange cover connection dimensions
Bolt hole center
Center circle diameter
Bolt hole
Bolt hole
M39×3
M45×3
M52×3
Flange cover
165, 5
Flange cover
Theoretical weight
Flange cover
Theoretical weight
Technical requirements
Technical requirements for flange cover shall be in accordance with the provisions of HG2062. Maximum non-impact working pressure
The nominal pressure of flange cover and the maximum non-impact working pressure at different temperatures shall be in accordance with the provisions of HG20625. 7 Fastener length
The length of the fasteners (bolts and studs) shall be in accordance with the provisions of IIG20G34 Record A. 8
Optional provisions
The selection of flange, gasket and fasteners shall be in accordance with the provisions of HG20635. 9
The marking of legal related products shall be in accordance with the provisions of HIG20615
Additional remarks: The unit proposing this standard, the chief editor and the main drafter Proposing unit: Chemical Process Piping Design Technology Center Station, Ministry of Chemical Industry Equipment Design Technology Center Station, Ministry of Chemical Industry
Chief editor: Equipment Design Technology Center Station, Ministry of Chemical Industry Drafting person: Cheng Daoguao Yu Jun
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