HG 20629-1997 Flexible graphite composite gasket for steel pipe flanges (American system) HG20629-1997 standard download decompression password: www.bzxz.net

Flexible graphite composite gaskets for steel pipe flanges (American system)
HG20629--97
1 Subject content and scope of application
This standard specifies the type, size and technical requirements of flexible graphite composite gaskets for copper pipe flanges (American system). This standard is applicable to flexible graphite composite gaskets for raised face steel flanges with a nominal pressure PV of 2.0MPa (Class 150) to 11.0MPa (Class 600) as specified in HG 20615. 437
GB2520
GB3280
ZBJ 22012
ZBI22019
HG 20615
Referenced standards
《Electroplated tinned steel sheets and strips》
Stainless steel cold-rolled steel sheets》
《Flexible graphite sheet compression rate, rebound rate test method》Technical conditions for flexible graphite tape for metal wound gaskets《Types and parameters of steel pipe flanges (American system)》3 Gasket use conditions
The applicable scope of gaskets is shown in Table 3.0.1, 3. (. 1
Table 3.0.1 Applicable scope of gaskets
Applicable scope of gaskets
Applicable scope of gaskets
Applicable scope of gaskets
Applicable scope of gaskets
Nominal PN, MFa (Class)
2. 0(Cl:ss 150)-11.0ttlaas 500)1 5.0(Clss 300)~11.0(Cla2x t00): 5.0(Class 30u) -~11.0(Ciass 600)The maximum working temperature of the gasket is shown in Table 3.0.2. Table 3.2 Maximum working temperature of the gasket Name of the gasket and package material (surrogate) Low sulfur bait (5t)
DCr18Ni9(304)
: Other plate materials can also be used, but it should be stated when ordering. When the medium is ≤450C.
GH2520
GR3280
Nominal diameter DN,tam
1 5~1500
15~600
15~600
Maximum working humidity,
4 Gasket type and size
4.0.1 Flexible graphite composite gasket is composed of punched or perforated metal core plate and expanded graphite particles. 4.0.2 Gaskets are divided into RF type, MFM type and TG type according to the sealing surface type, which are suitable for raised face, concave high face and grooved face flanges respectively, as shown in Figure 4.(.2. According to the needs, RF type gaskets can be provided with stainless steel or carbon steel inner edging (RF-E type), as shown in Figure 4.0.2,
4.0.3 Gasket size
The size of RF type and RF-E type gaskets for solid face flanges shall be in accordance with the provisions of Table 4.0.3-1~2. The size of MFM type gaskets for convex flanges shall be in accordance with the provisions of Table 4.0.3-3. TG type gaskets for birch face method are only The dimensions are in accordance with the provisions of Table 4.0.3-4. D
a. RF, MFM, TG gaskets (raised face, concave-convex face, grooved face) D
b. RF-E gasket (raised face, with inner edging) Figure 4.0.2 Gasket type
Nominal diameter
IN600mm RF and RF-E gasket size table for raised face cover 4.0.3.1
Table 4. 0. 3 - 2
Nominal diameter
Nominal pressure.PN,MPa(Class)
(Class 150)
(Clags300)
Gasket outer diameter D:
(Class6no)
DN>600mm raised face large diameter flange with RF and RF.-E type gasket size Gasket
Inner diameter:
Nominal pressure JIPN.MPa(Claus)
(Class150)
(Class 300)
Gasket outer diameter D
(Clags600)
Nominal diameter
Nominal diameter
Table 4. 0. 3—3
Dimensions of MFM type gaskets for concave and convex flanges
Table 4. 0.3 - 4
Dimensions of TG type gaskets for flanges
Technical requirements
The physical and mechanical properties of the flexible non-ink layer of the composite sheet shall comply with the provisions of ZBJ22019. The compression rate and rebound rate of the composite sheet shall be determined in accordance with the provisions of ZB 22012 (pressure head diameter 6.4mm, total load 1910N), and its performance shall comply with the provisions of Table 5.0.2. 5. 0. 2 Compression rate and rebound rate of composite sheets
Shrinkage rate, %
Rebound rate, %
5.0.3The dimensional deviation of RF type gasket shall comply with the provisions of Table 5.0.3. Table 5.0.3 Limit deviation of RF gasket size Nominal diameter
Inner diameter D:
Limit deviation
5.U.4 Limit deviation of MFM and TG gaskets in size shall be as specified in Table 5.0.4. Index
Outer diameter D
Limit deviation
Table 5.0.4 Limit deviation of MFM and TG gaskets in size Nominal diameter
Inner diameter D1
Limit deviation
Outer diameter D
Limit deviation
5.0.5 The thickness limit deviation of 1.5mm gasket is ±0.10mm, and the thickness limit deviation of 3mm gasket is ±0.20mm. The thickness difference of the same gasket shall not be greater than 0.20mm. 5.0.6 The surface of the gasket should be flat, without warping or deformation, and no obvious impurities, cracks, wrinkles, scratches or other defects are allowed. The edge cutting should be neat. The metal core plate should be well bonded with the flexible graphite layer. 5.0.7 The gasket should be made of a whole composite plate. For the gasket with an outer diameter greater than 1000mm, if it is spliced, the consent of the purchaser should be obtained. 443
6. Marking and packaging
6.0.1 The gasket should be packaged separately according to the type, specification and material, and the product quality inspection certificate should be attached when it is delivered. Gaskets shall be labeled with the content specified in 6.0.2. 6.0.2 Marking Example
Flexible graphite composite gasket for raised face flange with nominal diameter 100mm, nominal pressure 5.0MPa (Class 300), and core material of low carbon steel, marked as:
HG 20629
Graphite composite gasket
Flexible graphite composite gasket with inner hemming for raised face flange with nominal diameter 12(lrmm, nominal pressure 2.0MPa (Class 150), and core material of 0Cr18Ni9, marked as: HG 20629
: Graphite composite gasket
1200-2.0304
Flexible graphite composite gasket for concave 5-sided flange with nominal diameter 50mnm, nominal pressure 1.0MPa (Class600), core plate material 0Cr18Ni9, marked as: HG 20629bzxz.net
Graphite composite gasket
Additional instructions: The unit proposing, editing unit and main drafter of this standard 304
Proposing unit: 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 Cheng Daoyan Yu Jun
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