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Had a 3-inch steam line let go at 150 psi during a shutdown in Toledo last Tuesday.
We were doing a routine isolation for a valve swap. Pressure was supposed to be zero, but a bypass valve on a different loop was left cracked. Heard that hiss, then a bang. The whip took out a handrail and a light fixture. Nobody was in the path. The noise alone was enough to make your heart stop. It was a paperwork screw-up, pure and simple. The lockout tagout sheet didn't list that particular bypass. Always double-check the entire system, not just the tags in front of you. What's the most thorough way you guys verify zero energy before cutting in?
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