This standard specifies the type, size and technical requirements of weld lip seal rings for steel pipe flanges. This standard applies to weld lip seal rings for raised face butt welding flanges with a nominal pressure PN of 1.0MPa (10bar) to 16.0MPa (160bar) as specified in HGJ50 "Raised face butt welding steel pipe flanges". HG 20530-1992 Weld lip seal rings for steel pipe flanges HG20530-1992 Standard download decompression password: www.bzxz.net

Industry Standard of the People's Republic of China
Welding Lip Seal Ring for Steel Pipe Flange
20530-92
Editor: Equipment Design Technology Center of the Ministry of Chemical Industry Approval Department: Ministry of Chemical Industry Implementation Date: May 1, 1993
Engineering Construction Standard Editing Center of the Ministry of Chemical Industry
1993 Beijing
Subject Content and Scope of Application
This standard specifies the type, size and technical requirements of the bursting lip seal ring for steel pipe flange.
This standard applies to the welding lip seal ring for raised face butt welding flange with a nominal pressure PN of 1.0MPa (10bar) to 16.0MPa (160bar) as specified in HGI50 "Raised Face Neck Butt Weld Steel Pipe Flange".
Cited standards
699 "Technical conditions for high-quality carbon structural steel" 711 "Hot-rolled thick plates and wide strips of high-quality carbon structural steel" 1220 "Stainless steel bars"
3985 "Asbestos rubber sheets"
4037 "Stainless steel hot wheel steel plates"
50 "Raised face butt-welded steel pipe flanges" 66 "Technical conditions for steel pipe flanges"
22019 "Technical conditions for flexible graphite tape for metal wound gaskets" 33002 "Polytetrafluoroethylene sheets"
3 Types and sizes
There are two types of welding lip sealing rings for pipe flanges: flat type (FF type) and concave-convex type (MFM type) with auxiliary sealing gaskets, as specified in Figure 3 and Tables 3-1 to 3-2. 61
MFM type
Note: The dimensions in brackets are only applicable to those with * in Table 3-2, f.-1.2mm Figure 3 Welding lip seal ring
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FF type welding lip seal ring dimensions
Nominal pressure
-Table 3-—1
MFM type welding lip seal ring dimensions
PN1.0-2.5MPa
Table 3-2
Same as PN1.0~2.5MPa
Note:?
Continued Table 3-2
PN10.0~16.0MPa
Those with and indicate that the groove size is 4mm (see the note in Figure 3). The dimensions in brackets are only applicable to PN10.0MPa.
4 Conditions of use
4.0.1 Welding lip seal rings are used in situations where flange joint leakage is required to be minimized or eliminated. Such as high vacuum, transportation or processing of extremely hazardous and highly hazardous media.
4.0.2 Flat type (FF type) welding lip seal rings are used in general situations. 4.0.3 Concave-convex type (MFM type) with auxiliary seal has dual sealing functions of welding lip and auxiliary seal, which can reduce crevice corrosion; it is easy to align during installation and provides multiple functions for pressure testing and use.
According to user needs, auxiliary seals can be selected from 0.5mm thick flexible graphite, polytetrafluoroethylene, asbestos rubber sheet, lead, silver, soft aluminum, purple steel, etc., but they should be specified when ordering.
The outer diameter of the auxiliary gasket is d-1, and the inner diameter is d1. The maximum operating temperature of the welding lip seal (ring and auxiliary seal) is specified in Table 4.0.4, 4.0.4
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Maximum operating temperature (℃)
OCr18Ni9
0Cr17Ni12Mo2
Flexible graphite
Polytetrafluoroethylene
Asbestos rubber sheet
GB.699,GB711
GB1220, GB4037
ZBG22019
ZBJ33002
GB3985
Note: When used in oxidizing media, it should be less than or equal to 450℃. 66
Maximum working temperature
650 (send)
5 Technical requirements
5.0.1 The material of the weld lip seal ring shall comply with the forging requirements of HGJ66 "Technical Conditions for Steel Pipe Flanges". When made of steel plates, it shall comply with the requirements of Article 3.4 of HGJ66.
5.0.2 The dimensional limit deviation of the weld lip seal ring shall comply with the provisions of Table 5.0.2. Dimensional limit deviation
Diameter d1~d2
Height 15
f2 Convex surface height
Concave surface depth
Limit deviation
5.0.3 The weld lip seal ring consists of two upper and lower seal rings, which are supplied in pairs. 5.0.4
The concave surface of the MFM type seal ring shall be machined with spiral or concentric waterline, as specified in Table 5.0.4.
Waterline requirements
Waterline depth
Tool radius
The surface of the gasket should be flat, without warping and deformation, and the roughness of all machined surfaces should not exceed Ra12.5.
The sealing ring made of low carbon steel or low alloy steel should be coated with soil to prevent rust5. 0. 61
6 Marking and packaging
6.0.1 The sealing rings should be packaged in pairs according to the type, specification and material. The product quality inspection certificate should be attached when delivering, and the outer side of each pair of sealing rings should be marked with the contents specified in 6.0.2 with steel stamps.
6.0.2 Marking content
Standard code and standard number (HG20530): 6. 0.2.1
Type (FF or MFM);
Nominal diameter (mm);
Nominal pressure (MPa):
Material code of welding lip sealing ring and auxiliary sealing gasket, see Table 6.0.2.5. Material code
OCr19Ni9
0Cr17Ni12Mo2
Flexible graphite
Polytetrafluoroethylene
Asbestos rubber sheet
6.0.3 Marking example
Table 6.0.2.5
Welding lip seal (MFM type) with nominal diameter of 100mm, nominal pressure of 4.0MPa (40bar), material of 20 steel and flexible graphite auxiliary gasket The ring is marked as: HG20530 welding lip sealing ring MFM100-4.020/G68
Appendix A Installation and maintenance of welding lip sealing ring
(reference)
A1 Installation and welding
A1.0.1 The welding lip sealing ring should be sealed and positioned with the flange surface on the outside, but attention should be paid to the centering of the positioning to avoid affecting the assembly accuracy of the welding lip sealing ring groove after assembly, as well as (the installation of MFM type D sealing ring.|| tt||When the medium has a tendency to crevice corrosion, the weld lip sealing ring should be fillet welded on the inside and outside respectively. The weld leg height of the outside fillet weld is 5mm. A1.0.2After the flanges are assembled, two or more bolts are installed symmetrically for pre-tightening, and then the weld lip is sealed (generally using argon arc welding). Before welding, the weld lip groove should be ground as necessary. After welding, install and tighten all bolts. A1.0.3When installing the FF type sealing ring, the bolt pre-tightening force should be slightly greater than the internal pressure caused by Axial force. When installing MFM type sealing ring, the bolt preload shall not only consider the axial force caused by internal pressure, but also the preload required to ensure the auxiliary sealing gasket. When using 0.5mm thick flexible graphite, polytetrafluoroethylene, asbestos rubber sheet as auxiliary sealing gasket, the m and y values ​​when calculating the sealing load shall refer to Appendix A1. Appendix A1
Material
Flexible graphite
Polytetrafluoroethylene
Asbestos rubber sheet
y(MPa)
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