This standard specifies the type, size, technical requirements and relevant use regulations of socket ring loose steel pipe flanges for lined steel pipes. This standard is applicable to socket ring loose steel pipe flanges for non-metallic lined steel pipes with nominal pressure PNO.6MPa (6bar) ~ 1.6MPa (16bar). HG 20528-1992 Socket ring loose steel pipe flanges for lined steel pipes HG20528-1992 Standard download decompression password: www.bzxz.net

Industry Standard of the People's Republic of China
Socket ring loose sleeve steel pipe flange for lined steel pipe HG20528-92
Main editor: Equipment Design Technology Center of the Ministry of Chemical Industry Approved by: Ministry of Chemical Industry
Implementation date: May 1, 1993
Engineering Construction Standard Editing Center of the Ministry of Chemical Industry
1993 Beijing
1 Subject content and scope of application
This standard specifies the type, size, technical requirements and relevant use regulations of socket ring loose sleeve steel pipe flange for lined steel pipe. This standard applies to socket ring loose sleeve steel pipe flange for non-metallic lined steel pipe with nominal pressure PN0.6MPa (6bar) 1.6MPa (16bar). 25
2 Reference standards
HGJ66 "Technical conditions for steel pipe flanges"
HGJ67 "Pressure-temperature grades for steel pipe flanges" HGJ68 "Dimensions of welded joints and grooves for steel pipe flanges" HGJ76 "Provisions for the selection of steel pipe flanges, gaskets and fasteners" GB12384 "Technical conditions for ductile iron pipe flanges" 26
3 Types and dimensions
The types (SW-LJ types) and dimensions of flanges shall be in accordance with the provisions of Figure 3 and Tables 3-1 to 3-3.
Lining layer
R, respectively, are the fillets of the inner edge of the loose flange and the outer side of the socket ring. Figure 3 Socket ring loose sleeve steel pipe flange (SWLJ type) 27
Flange inner diameter
Flange original size
Flange inner diameter
Flange thickness
Flange inner diameter
Flange thickness
4 Technical requirements
4.0.1 The technical requirements for flanges shall be in accordance with the provisions of HGJ66 "Technical Conditions for Steel Pipe Flanges", and the dimensional tolerances of socket rings shall be in accordance with the provisions of Table 4.0.1. Dimensional tolerance of socket ring
Thickness SSs
Height H
Diameter N, BWww.bzxZ.net
Outer diameter d
Dimensional model
≤DN80
≥DN100
≤DN100
≥DN125
Plate limit deviation
4.0.2 Socket ring, loose flange (including steel pipe) are generally made of low carbon steel, such as Q235A, 20. With the agreement of both parties, the flange of the loose flange can also be made of ductile iron material in accordance with GB12384. 4.0.3 According to user requirements, the matching steel pipe wall sequence S different from that specified in this standard can be used, but it should be indicated when ordering.
5 Maximum non-impact working pressure
The nominal pressure of the flange and the maximum non-impact working pressure at different temperatures shall be in accordance with the provisions of HGJ67 "Pressure-Temperature Grade of Steel Pipe Flange". However, the service pressure and temperature shall also take into account the applicability of the non-metallic lining layer. 32
6 Welded joints
The welded joints between the socket ring and the steel pipe shall be in accordance with the provisions of Article 5 of HGJ68 "Welded joints and groove dimensions of steel pipe flanges" for socket welding flanges. 33
7 Fastener length
The length 1 of the listed fasteners (bolts, studs) refers to the length of the combination of two flanges of the same type and pressure grade (without considering the flange thickness of the ring and thick lining layer). In other cases, the fastener length should be recalculated. 34
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