Problem Summary
Anomaly Description:
An H2S leak was found on the body flange of a 2” Double block and bleed valve, H2S was bypassing the gasket and leaking through the bolt holes.
Root causes:
The root cause of the leak is due to a deteriorated spiral wound gasket and body seal resulting in H2S passing through into the bolt pockets of the valve body.
Integrity concerns:
Further deterioration and complete failure of the 316 stainless spiral wound gasket leading to high amounts of H2S leaking.




