This standard specifies the dimensions of welded joints and grooves of steel pipe flanges (European system) connected to steel pipes. This standard applies to steel pipe flanges specified in HG 20592. HG 20605-1997 Dimensions of welded joints and grooves of steel pipe flanges (European system) HG20605-1997 Standard download decompression password: www.bzxz.net

Steel pipe flange welding joint and groove dimensions (European system)
HG20605-97
, Subject content and scope of application
This standard specifies the welding joint and groove dimensions of steel pipe flanges (European system) connected to steel pipes. This standard applies to steel pipe flanges specified in HG20592, 163
HG 20592
Reference standard
"Steel pipe flange types and parameters (European system)" 3 Plate slip-on flanges and slip-on ring loose flanges The welding joints of the plate slip-on flanges and slip-on rings shown in Table 3.0.1 and the steel pipes shall comply with the requirements of Figure 3.0.1 3. 0. 1
Flange type
Plate slip-on flange
Plate slip-on ring
Table 3. 0. 1
Nominal pressure PN, MPa (bar)
0.25 (2.5)
Nominal diameter DN.mm
10~2000
10--1600
10~600
10~600
10~600
3.0.2 The dimensions of the welded joints and grooves of the plate-type flat-welding flanges and flat-welding rings connected to the steel pipes shown in Table 3.0.2-1 shall comply with the requirements of Table 3.0.2 and Table 3.0.2-2.
Table 3.0. 2—1
Type of flange
Plate flat welding flange
Welding ring
Nominal pressure PN, MPa (har)
Nominal diameter DN.mm
1800-2000
10~600
10~600
Nominal diameter DN
Groove width b
Nominal diameter DN
Groove width b
Figure 3r02
Table 3. 0. 2-2
4 Neck flat welding flange
4.0.1 The welded joint of the semi-welded flange with lock shown in Table 4.0.1 and the steel pipe shall comply with the requirements of Figure 4.0.1. Table 4. 1
Legal type
City-leading flat coal flange
Nominal PN.MF (br)
f≥1. 4s
but not greater than neck thickness
Figure 4. 0. 1
Nominal diameter DN, mm
10-~400
4.0.2 The welding joint and groove dimensions of the flat welding flange with neck shown in Table 4.0.2-1 connected to the steel pipe shall comply with the requirements of Figure 4.0.2 and Table 4, 2-2,
Table 4.0.2~1
Flange type
Neck flat welding method "
Nominal Ji PN,MPe(bur)
Nominal diameter DN,mm
450--600
10-600
10～600
10--600
Nominal diameter N
Figure 4. 0. 2
PN2. 5MPa(25har)
Groove width 6
4.OMPa(40bar)bZxz.net
5 Socket welding method
The welded joint connected to the steel pipe by the socket welding method shall comply with the requirements of Figure 5-1f1, 4s
but not greater than the neck thickness
Figure 5-1
Neck butt welding flange
The welded joint and groove dimensions of the neck butt welding flange connected to the steel pipe shall comply with the requirements of Figure 6-1(a). If the straight edge of the neck welding flange exceeds the wall thickness of the steel pipe with which it is connected by more than 1mm, the straight edge of the flange should be thinned at the inner diameter, and the slope of the thinned section should be less than or equal to 1:3. As shown in Figure 61(b). Steel pipe side
37.5°±2.59
37.5°±2.5°
Flange side
Figure 6-1
Steel specification
Flange side
Note: When the flange is connected to a ferritic steel pipe with a nominal wall thickness of ≤4.8mm or an austenitic steel pipe with a nominal wall thickness of ≤3.2mm, the blunt edge can be eliminated. 170
Butt welding ring
The size of the welding joint and the slope gate of the butt welding ring of the loose flange connected to the steel pipe shall meet the requirements of Figure 71. Steel pipe side
37.59±2.
37.5°±2.5
Butt welding ring measurement
Figure 7-1
Jiang: When the butt welding ring is connected to the austenitic steel pipe with a nominal wall thickness of 3.2mm. The blunt decision can be eliminated. Additional notes: This standard proposes the unit, editor and main drafter proposes: Chemical Industry Equipment Design Technology Center Station Chemical Industry Chemical Process Piping Design Technology Center Station Chief editor: Chemical Industry Equipment Design Technology Center Station Main drafter: Pan Daoyan Yijun
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