XTO Energy Explosions 2.Air/foam assisted flowback operations had been engaged for 12 – 15 hours 3.Gas, water, oil, sediment and oxygen were piped from the wellhead to temporary non- pressure rated frac tanks 4.Each frac tank was internally lined with an Epoxy type liner 5.Each tank had a screwed together downcomer protruding into the frac tank 2 – 3'
{}