As everybody know that in spiral wound gasket the outer ring is meant to be as a centering ring for assembly and is being called for by default. The inner ring is to remove the potential for the spot weld joint on the spiral ring to corrode or crack leading to the metallic spiral ring unwinding. The result of this failure may cause an obstruction in the pipe bore, breakdown of the gasket and ultimately reduce the sealing integrity of the joint. So it is advisable to prescribe SPW gaskets with inner and outer rings of suitable material compatable with the service in category M as prescribed in B31.3.
With regards,
Kannan.
Linde, Germany.
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