Pyrophoric Tank Degassing Challenge A customer came to Envent with an invitation to bid on an upcoming tank degas project. It was stated that facility storage tank 395 was to be degassed, cleaned, and then demolished. The external floating roof tank had been in slop oil service. By the time of bidding, the tank had been decommissioned for several years. The tank was approximately 100' in diameter and 40' shell height. Since the roof had landed on its legs a few years earlier, the customer was sure vapors were minimal. The logic being the vapor pressure would have pushed past the roof seals over time, venting the contents to atmosphere. Envent prepared a proposal that considered the customer’s assertion the tank would need minimal degassing. Also included was an additional degas duration th

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