Comparing ASME B16.20 and BS 3381 I see they are not.
How did you come to that conclusion?
2" (DN50/900&1500#) 8" (DN200/1500#)
B16.20 BS 3381 B16.20 BS 3381
Outer locating ring 143 142.9 352.6 352.4
outer gasket seal 85.9 86.1...
I am working on a Project where it has been stipulated that all spiral wound gaskets are to be manufactured in accordance with B16.20 accept for 25/1500# and 50/1500# which must be BS3381.
I am trying to figure out what the differences between the gaskets are as I have seen gaskets manufactured...