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Dimensions of gaskets for pipe flanges
This British Standard specifies the “plan” dimensions of gaskets suitable for use with flanges to BS 107), BS 17708) and BS 20359).
This standard does not include spiral edge-wound or other special types of gasket.
Dimensions of gaskets for use with flanges to BS 10, Table K, Table R and Table S have been limited to sizes up to and including 15 in, 5 in and 3 in flange size designations respectively and no gasket dimensions have been standardized for BS 10, Table T.
This is because wide variations may occur in the actual inside diameters of steel pipes fitted with flanges of the same size designations to the higher tables of BS 10. In such cases, it is not practicable to specify the inside diameter of gaskets and there would be little advantage in specifying the outside diameters only.
NOTE Gasket dimensions for flanges for the petroleum industry are given in the British Standards for pipe flanges and gaskets for the petroleum industry, BS156010), BS 329311), BS 338112), BS 157513) and BS 157614).
'Plan' dimensions for 'inside bolt circle' and 'full face' gaskets or pipe flanges in accordance with BS 10 and BS 2035, and 'full face' gaskets for flanges to BS 1770.
The tables giving dimensions bear the same designation as the flange tables in the appropriate pipe flange standard.
Marking of gaskets for purchasing and identification.
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