This standard specifies the type, size, technical requirements and relevant use regulations of stainless steel lined flange covers (European system). This standard applies to stainless steel lined flange covers with nominal pressure PNO.6 M Pa (6 bar)-4.0 M Pa (10 bar). HG 20602-1997 Stainless steel lined flange covers (European system) HG20602-1997 Standard download decompression password: www.bzxz.net

Stainless steel lined flange cover
(European system)
HG 20602—97
1 Subject content and scope of application
This standard specifies the type, size, technical requirements and relevant use regulations of stainless steel lined flange cover (European system). This standard is applicable to stainless steel lined flange cover with nominal pressure PNo.6MPa (6bar) ~ 4.0MPa (40bar). Note: This standard is applicable to vacuum environment. In addition to the technical requirements for fusion welding, this standard is also applicable to flanges made of other metal materials that can be fusion welded with carbon steel.
HG20592
HG20603
HG20604
HG 20613
HG20614
HG 20581
JB/T4709
Referenced standards
《Types and parameters of steel pipe flanges (European system)》《Technical conditions for steel pipe flanges (European system)》《Pressure-temperature grades of steel pipe flanges (European system)》《Fasteners for steel pipe flanges (European system)》《Selection regulations for steel pipe flanges, gaskets and fasteners (European system)》《Material selection regulations for steel chemical containers》《Welding regulations for steel pressure vessels》
3 Sealing surface types and applicable scope of stainless steel lined flange covers 3.0.1 The cover type of stainless steel lined flange covers has raised surface (RF Type), convex surface (M) and convex surface (T). The selection is in accordance with the provisions of Chapter 6 and Chapter 8 of HG20592. 3.0.2 The applicable pressure and diameter range of various sealing surface types of stainless steel lined flange covers shall be in accordance with the provisions of Table 3.0.2. Table 3.0.2 Applicable range
Sealing surface type
Convex surface (RF)
Convex surface (M)
Tight surface (T)
Male T) PN.MPa(bar)
DNJ600
4 Stainless steel lined flange cover dimensions
The dimensions of stainless steel lined flange covers shall be in accordance with Figure 4-1 and Tables 4-1~5 Table 4-1 PN0.6MPa (6bar) stainless steel lined single flange cover Table 4-2 PN1.0MPa (10bar) stainless steel lined heavy flange cover Table 4-3: FNVl.GMFa (J6har) stainless steel lined flange cover Table to ~4PV2.5MFa (25bar) stainless steel lined flange cover Table 1-5 PN1.0MPa (40bnr) stainless steel lined flange cover 1.28
Raised face (RF)
Raised face (M)
Turned face (T)
Figure 4-1 Stainless steel village flange cover (BL (S)) 125
41PNU.6MPa (Gbur) Stainless steel lining flange cover connection size
Flange screw hole center screw hole screw wheel hole
First diameter number
Outer diameter center number
Sealing surface size small lining black thickness welding hole (sinus surface), theoretical weight shore (kg) raised surface
Center national random diameter number legal benefit lining single layer
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5 Technical requirements
5.0.1: The technical requirements for stainless steel lined single flange cover shall meet the requirements of HG20603. 5.0.2 The lining layer and the flange cover should fit tightly and be welded according to the provisions of JB/4709. The bottom layer welding materials for fillet welding and plug welding holes should be selected according to the transition layer welding rod of HG20581, and the bottom layer welding materials should be selected according to the cover layer welding rod according to the provisions of Table 5.0.2. The fillet weld angle height is equal to the peripheral thickness of the lining layer, and the plug weld should be full. Table 5.0.2 Plug welding requirements
Welding materials
Transition layer specified in HGJ20581
Cover layer welding specified in HGJ20581
Low phosphorus stainless steel lining
Bracket bottom layer welding
Steel welding hole surface layer welding
Ultra-low phosphorus stainless steel filler
Parent material plug welding hole welding
Lining layer plug welding hole welding
5.0.3 An M6 ventilation and inspection hole should be opened on the flange cover, and the position is determined by the user. After the cold explosion, the compressed air with a pressure not less than 0.1MPa should be passed through for inspection. Other sizes of inspection holes can also be opened according to the manufacturing conditions. 5.0.4 The limit deviation of the lining layer thickness 1 is -11nm. 135
6 Maximum non-impact working pressure
The nominal pressure of the lined single flange cover and the maximum non-impact working pressure at different temperatures shall be in accordance with the provisions of HG20604 according to the flange cover material category. The service temperature limit of the stainless steel lined flange cover shall not exceed 350℃. 7 Fastener length
The length of the fasteners (bolts and screws) used (according to the provisions of HG 20613 Xie Lu A. Matching regulations
The matching of the lined flange cover, the seal and the fasteners shall be in accordance with the provisions of HG20614. Marking example
The marking of the lined flange cover shall be in accordance with the provisions of HG20592. Additional notes: This standard proposes the unit, editor and main drafter proposes: Equipment Design Technology Center Station of the Ministry of Chemical Industry Chemical Process Piping Design Technology Center Station of the Ministry of Chemical Industry Editor: Chemical Upper Equipment Design Technology Center Station Main drafter: Fang Daoyan Yu Jun
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