GOST flanges and Relevant gaskets

[Rayan2002]

Dear Members,

Can anybody kindly help me? I tried to find the relevant gaskets for the GOST flanges, but there is nothing in the standard that can help me. FYI: I have the below standard:
GOST 12821- 80 for butt welded flanges and the types, connecting dimensions and dimensions of sealing surfaces are in GOST 12815-80, which there 9 type of flanges, but the non of these standards do not specify which type & size of gasket need to be used for them?
The gasket standard is:
Washers for flanged connections with medium temperature from 0° to +650°C. Design and dimension by GOST 9065-75
 ОSТ 26.260.461-99 «Steel gaskets of oval and octangular section for flanges of valves
 ОSТ 26-845-73 «Design and dimension. Technical requirements»
 АТК 26-18-6-93 «Steel gaskets of oval and octangular section»
 GOST 28759.8-90 «Metal gaskets of octangular section for flanges of vessels and apparatus»
 GOST 10493-81 «Rigin and compensating lens-shaped seals for Pn 20-100 MPa»
And even there is lens shaped seals according to GOST 10493-81.

Can somebody pleae help to find what type of gasket to be used for which flnage.
Many thanks & Regards,

 

[racookpe1978]

The GOST standards are for USSR/Russia, but the same reply would apply to ANSI or EU standards.

The gasket (and stub/bolt and nut) are determined by the different fluid pressure and temperature of the different designs. Not the 0-650 temperature you listed.

 

[Rayan2002]

@racoookpe1978, thanks for reply, but what I was asking is like for 100 size flange, what is related gasket to be ordered, is there any ring no like ASME?

 

[racookpe1978]

No. See, only the gasket size (OD, ID, thickness, tolerances) is set by the pipe nominal diameter.

For every DIFFERENT service which including EVERY different fluid pressure and temperature, a different material and style of gasket is required. Thus, there can be twelve or 16 different ring joint gaskets sized to properly fit a 100 mm PNOM GOST ring-joint flange. But only one of those 100 mm ring joint gasket is proper for YOUR service and pressure and temperature and price. A low pressure high temperature ring joint gasket for acetone will be very different than a ring joint gasket for superheated steam service or very high pressure crude service at lower temperatures.

Buying a wrong gasket is potentially deadly and could kill people. Buying a too-expensive gasket will kill your company.