This standard specifies the nominal diameter, nominal pressure, flange type, connection size, sealing surface size and marking of steel pipe flanges (European system). This standard applies to steel pipe flanges and flange covers with a nominal pressure PN of .25 MPa (2.5 bar) to 25.0 MPa (250 bar). This standard also applies to valves, pumps, chemical machinery, pipeline accessories and equipment parts that use flanges as the connection type. HG 20592-1997 Steel pipe flange types and parameters (European system) HG20592-1997 Standard download decompression password: www.bzxz.net
This standard specifies the nominal diameter, nominal pressure, flange type, connection size, sealing surface size and marking of steel pipe flanges (European system). This standard applies to steel pipe flanges and flange covers with a nominal pressure PN of .25 MPa (2.5 bar) to 25.0 MPa (250 bar). This standard also applies to valves, pumps, chemical machinery, pipeline accessories and equipment parts that use flanges as the connection type.

Types and parameters of steel pipe flanges
(European system)
HG 20592 -- 97
Subject content and scope of application
This standard specifies the nominal diameter, nominal pressure, flange type, connection size, sealing surface size and marking of steel pipe flanges (European system).
This standard is only applicable to steel pipe flanges and flanges with a nominal pressure PV of 0.25MPa (2.5bar) to 25.OMPa (250bar).
This standard is also applicable to valves, pumps, chemical machinery, pipeline accessories and equipment parts that use flanges as the connection type.1
GB 1048
HG 20553
HG 20593
HG20594
HG 20595
HG20596
HG 20597
HG 20598
HG20599
HG 20600
HG 20601
HG20602
Reference standards
《Nominal pressure of pipeline components》
《Selection series of seamless and welded steel pipe sizes for chemical piping》《Plate flat-welded steel pipe flange (European system)\《Neck flat-welded steel pipe flange (European system)》《Neck butt-welded steel pipe flange (European system)\&Integral steel pipe flange (European system)》《Socket welding steel pipe flange (European system)》Threaded steel pipe flange (European system) 3 Nominal diameter and outer diameter of steel pipe
The outer diameter of steel pipes applicable to this standard includes two series, A and B. Series A is the international general series (commonly known as British pipes) and series B is the internal series (commonly known as metric pipes). The nominal diameter DN and outer diameter of steel pipes are specified in Table 3-1. Table 3-1
Nominal diameter DN
Nominal diameter DN
Nominal diameter DN
Nominal diameter and steel outer diameter
PN25.DMPa (250bar) pipe flange applicable steel pipe outer diameter series according to Table 3-2. 50
Table 3~-2PN25.0MPa (250bar) flange applicable pipe outer diameter series Nominal diameter N
Steel pipe outer diameter
10--65
Solid cutting 3~||tt ||Nominal pressure
The nominal pressure PNV of flange includes the following ten levels: 0.25MPa (2.5bar), 0.6MPa (6bar), 1.0MPa (1obar), 1.6MPa (16bar), 2.5MPa (25bar), 4.0MPa (40bar), 6.3MPa (63har), 10.0MPa (100bar). 16.0MPa (160bar), 25.0MPa (250bar). Flange type
5.0.1 Flange type shall be in accordance with the provisions of Figure 5.0.1 and Table 5.0.1. Plate type flat welding flange
Integral flange
Neck welding flange
Ball welding flange
Butt welding ring loose flange
(PJ/SE)
Flange type
Figure 5.0.1
Butt welding flange with neck
Threaded flange
Slip welding ring loose flange
(PI/RJ)
Village flange cover
(BL(S))
Flange type
Plate type flat welding flange
Neck flat welding flange
Neck welding flange
Integral flange
Ball welding flange Plug welding flange
Threaded flange
Slip-on loose flange
Flange cover
Lined flange
Table 5..1 Flange type and type code
Flange type code
Standard number
HG20593
HG20594
HG 20595
HG 20596
HG 20597
HG20598
HG20399
HG 20GO
HG 2GH
HG20602
Difference: The "butt-weld ring sleeve flange" in the standard series is different from the GB/T9120-2000 "butt-weld ring plate sleeve flange". The difference lies in the type of "butt-weld ring" (see Figure 5.0.1). If you need to use the "butt-weld ring plate sleeve flange" of the flange, please select it according to the GR/T9120.1-9120.3-2000 standard. 11
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Sealing surface type
The sealing surface type of flange shall be in accordance with the provisions of Figure 6.0.1 and Table 6.0.1. Sinus face (RF)
Tandy face (TG)
Ring joint face (R)
Figure 5%1 Sealing face type
Four-convex face (MFM)
Full flat face (FF)
Sealing face type
Western face
Grooved face
Gold balance
Table 6.4.1 Sealing
Nominal force PN.MPA
0. 25 0. 6 1.6 3.6 1
DN10--2000
DN10-EN10
T16.0T25.
DN10~4G0
DN10-~400
DN10~-600
DN10~600
DN10-600DN10--2000
EN10--400
DNI0~-300
DN15-405DN15300
Ring connection surface
Note: When the intersection of PN4.0MPa and Darlan adopts non-metallic flat gaskets, polytetraoxyethylene coated gaskets and flexible graphite composite gaskets, dense veins can be machined. 2
The waterline of the groove, the sealing surface code is RF(A),
The sealing surface types of various types of flanges are in accordance with the provisions of Table 6.0.2, the extraction type
Pole-type flat welding flange (PL)
Smooth-faced flat welding flange (SO)
Neck-jointed flange (WN)
Integral flange (F2)
Socket welding flange (SW)
Threaded flange (TL)
Pair braided loose flange (FJ/SF)
Pair flat loose flange R
Flange (BL)
Pair spot cover (BL(S))
Flange type and sealing surface type
Table 6.2
Sealing surface test
Sinus surface (RF)
Gold plane (FF)
Raised surface (RF)bzxZ.net
（MFM）
Groove surface IG
Halo apple (F)
Sinus surface (RF)
Electric surface MFM
Rod surface (TG)
Ring connection surface (R)
Gold (FF)
Sinus (RF)
Country front MM)
Growth surface (TG)
Bad connection surface (RI)
Gold plane (FF)
Sinus surface (RF)| |tt||Surface (MFM
Groove surface (TG)
Sinus Gong surface (RF)
Full plane (FF)
Sinus fungus (RF)
Yi Pu (RF)
Surface MFM
Thin squeezed surface (TG
Solid surface (RF)
Written (MFM)
Birch groove surface (TO)
Ring connection surface (R)
Full plane (FF)
Fresh surface (R)
Convex surface (M)
Feng Nan (T)
Jade strength grade PN.MPa
0. 25--1. 6
1.0~-4. 0
0. 6 ~.1. 6
1.0--25, 0
1. 0--16. 0
6.3--25. 0
1. 0~1. 6
0. 6--25. 0|| 0
6. 3~25. 0
1, 0--10. 0
1.0~-10.0
0, 6~4. C
-0. 6-1. 6
0. 6~- 1. 6
1. 0~1, 6
0.25-~25. 0
1. 0~16 c
1. 0~-16. )
6. 3 ~ 25. 0
1. 0~~4. 0
Maintenance. 0.3 Selection of flange sealing surface type shall refer to the provisions of Appendix A. If there are special needs, other sealing surface types can be selected according to Table 6.0.2.
Connection dimensions
The connection dimensions of the standard shall be in accordance with the provisions of Figure 71 and Table 7-1 (the black line frame in Table 7-1 is the flange with the same connection dimensions of different pressure levels),
have basically the same connection dimensions (including sealing surface dimensions). The domestic and foreign pipe flange standards that can be used with this standard flange are shown in Appendix B.
Figure 1 Connection dimensions
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