HG 20633-1997 Metallic Ring Gaskets for Steel Pipe Flanges (American System) HG20633-1997 Standard download decompression password: www.bzxz.net

Metal ring gaskets for steel pipe flanges
(American system)
HG 20633-97
1 Subject content and scope of application
This standard specifies the type, size and technical specifications of octagonal and elliptical metal ring gaskets for steel pipe flanges (American system). This standard is applicable to metal ring gaskets for ring-joined flanges with a nominal pressure PN of 2.0MPa (Class 150) to 42.0MPa (Class 2500) as specified in HG20615. 473
GB 699
GB 1220
HG 20615
IB4726-4728
Cited standards
&Technical conditions for high-quality carbon structural steel
National Stainless Steel Bars
"Types and parameters of steel pipe flanges (European system)" Forged steel parts for pressure vessels
3 Conditions for use of gaskets
The maximum operating temperature of the gasket shall be in accordance with the provisions of Table 3-1. Table 3-The maximum operating temperature of the entire piece
Material name
10 or 08
OCr18Ni9 or
OCr17NE2Mu2
GB1220
Maximum operating temperature, core
4 Gasket type and size
Metal ring gaskets are divided into octagonal and circular metal rings according to the cross-sectional shape, as shown in Figure 4.0:1. The dimensions of octagonal and circular metal rings are as specified in Table 4.0.2. P
Octagonal
Figure 4. 0.1 Type of gasket
6f *01
II 'LL:
881692
86*081
89*661
(OOt )eOSan
(O0 )O
Nominal diameter
Continued Table 4. 0. 2
PN12.0MPa(Cless 2500)
41- 45
211-12
Oval
Ring plane
Technical requirements
5. 0. 1 The hardness value of the metal ring gasket material should be 30~40HB lower than that of the flange material, and its maximum value shall not exceed that in Table 5. 0.1.
5.0.2 The hardness of the metal ring gasket shall be uniform and measured on the circumference. The average hardness shall meet the requirements of Table 5.0.1.
Table 5.1 Hardness value of metal ring gasket materials 10 or 08
Cr18Ni9
Cr17Ni12Mo2
10 or 08
Maximum hardness value (HB)
5.0.3 The metal ring gasket shall be made of forgings after appropriate heat treatment and machining. The forgings shall meet the requirements of JB4726~~4728. Metal ring gaskets are not allowed to be welded. 5.0.4 The dimensional limit deviation of the metal ring gasket shall be in accordance with the requirements of Table 5.0.4. The limit deviation of the size of the metal ring is: the width of the ring plane should be: ±0.40 (cm) radius of the fillet: As long as the difference between any two points of the metal ring does not exceed 0.4mm, the limit deviation of the ring height B or H can be +1.2mm. 5.0.5 The sealing surface of the metal ring (octagonal pad slope or elliptical arc surface) shall not have scratches, sulfur marks, cracks and snake points, and the surface roughness shall not exceed Ra1.6. 5. 1. For the metal ring made of 10 or 08 steel, the surface should be coated with anti-rust oil after inspection. 480
Marking and Packaging
6.0.1 Ring gaskets shall be packed according to type, specification and material. A product quality inspection certificate shall be attached upon delivery, and the outside of each metal ring gasket shall be stamped with the contents specified in 6.0.2. 6.0.2 Marking contents
(1) Standard number (HG20633):
(2) Nominal diameter (mm):bZxz.net
(3) Nominal pressure (MPa)
(4) Ring number:
(5) Material code (see Table 5.0.1). 6.0.3 Marking example
Octagonal metal ring gasket with nominal diameter of 100mm, nominal pressure of 11.0MPa (Class 600), ring number R37 and material of 0Cr18Ni9 is marked as:
HG 20633
Octagonal gasket
100—11.0
Additional instructions: Proposer, main contractor and main drafter of this standard Proposer: Chemical Process Piping Design Technology Center Station, Ministry of Chemical Industry Equipment Design Technology Center Station, Ministry of Chemical Industry
Editor: Equipment Design Technology Center Station, Ministry of Chemical Industry Main drafter: Ying Daoyan Yu Jun
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