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Gasket Selection

1 basic principles optional spacer
Use or to order gasket should be aware of the following data:
① mating flange sealing surface type and size;
② flanges and gaskets nominal diameter;
③ nominal flanges and gaskets;
④ fluid medium temperature;
⑤ the nature of the fluid medium.
Gasket selection should also consider some of the following factors:
① a good compression resilience, able to adapt to fluctuations in temperature and pressure;
② good ductility, with the flange sealing surface good fit;
③ Do not contaminate process media;
④ have sufficient strength, not because of the working medium pressure and clamping force and cause damage;
⑤ easy to harden at low temperatures, the amount of shrinkage is small, easy to soften at high temperatures, good creep resistance;
⑥ processing performance, easy installation;
⑦ not bonded flange sealing surface, easy to remove.
(2) the selection of standard gasket
Sizes have been standardized domestic gasket can be used with reference to Table 3-19, listed in the table for the common circular gasket gaskets, excluding profiled gaskets and non-standardized gasket.
                 

Table 3-19 Standard gasket selection

Gasket Type
Gasket material
Conditions of Use
Use sealed condition
Uses
PN/MPa
T/
Asbestos rubber gasket
ARS200
ARS350
ARS450
≤1.5
≤4.0
6.0
≤200
≤350
450
Whole plane
Projection plane
Convex surface
Tongue and groove
For water, steam, air, ammonia (gaseous or liquid) and an inert gas
Asbestos rubber gasket
NAS150
NAS250
NAS400
≤1.5
≤2.5
4.0
≤150
≤250
400
Whole plane
Projection plane
Convex surface
Tongue and groove
For oil, liquefied petroleum gas, petrochemical raw materials and other media. Does not apply to gasoline and aviation gasoline
PTFE coated pad
Clad layer: PTFE
Embed layer: Asbestos rubber sheet
4.0
≤150
Projection plane
For a variety of corrosive media and media with cleaning requirements
Filled with material
Special asbestos
25.0
≤500
Projection plane
Convex surface
Tongue and groove
For a variety of liquid and gaseous media. If hydrofluoric acid medium should be used for graphite tape with Monel metal strip material
PTFE
-200~260
Flexible graphite
≤600(For the non-oxidizing medium≤800)
Flexible graphite composite gasket
Core material
Low-carbon steel
6.3
≤450
Projection plane
Convex surface
Tongue and groove
For steam and a variety of corrosive media. Requirement does not apply to a clean container and piping
0Cr19Ni9
≤600
Metal coated gasket
Cladding layer material
Pure aluminumL3
10.0
≤200
Projection plane
For steam, gas, oil, gasoline, solvents and general process media
Copper EditionT3
≤300
Low-carbon steel
≤400
Stainless steel
≤500
Metal toothed combination gasket
Toothed ring and the cover layer material
10和08/Flexible graphite
25.0
≤450
Projection plane
Convex surface
For medium and high pressure vessels and piping
0Cr13/Flexible graphite
≤540
0Cr19Ni9/Flexible graphite
≤650
0Cr19Ni9/PTFE
≤200
0Cr17Ni12Mo2/PTFE
Toothed washer
08or10
16.0
≤450
Projection plane
Convex surface
For high temperature, high pressure vessels and piping
0Cr13
≤540
0Cr19Ni9
≤600
0Cr17Ni12Mo2
≤600
Metal ring gasket
08or10
42.0
≤450
Ring joint face
For high temperature, high pressure vessels and piping
0Cr13
≤540
0Cr19Ni9
≤600
0Cr17Ni12Mo2
≤600
 

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