Alert 08 – 40 Failure of Back Flow Valve During Nitrogen Foam Frac Results in a Fatality


A fatality occurred when a service company was performing a two stage nitrogen foam frac treatment. The rig-up required four nitrogen pumps manifolded together. In the process of beginning the second stage, a nitrogen pump failed to maintain prime on the boost pump. While attempting to regain prime, gas from the remaining pumps back-flowed into the nitrogen pump’s storage vessel. The relief system on the vessel was not capable of venting the volume of gas entering the vessel resulting in a catastrophic failure due to overpressurization.

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