If a cylinder shows bulging during inspection, what is the proper action?

• A. Continue filling
• B. Fill after repairing
• C. Stop filling and remove from service
• D. Drain and re-inspect

Answer: (C)

Bulging means the cylinder’s wall has been overstressed and its structural integrity is compromised. Because a bulged cylinder can fail violently, the safe action is to stop filling and remove it from service immediately. It must not be repaired or reused in the field; instead, isolate it and have a qualified inspector determine whether it can be repaired, requalified, or must be retired. Draining and re-inspecting or continuing to fill would not address the underlying weakness and could lead to a catastrophic failure.