DOUG LENT, INC.: PUGET SOUND NAVAL SHIPYARD

BREMERTON, WA.- CLEAN A 400’ CONTAMINATED NATURAL GAS LINE

Marine Vacuum Service utilized two vacuum trucks, one on each end of the line. One was filled with a cleaning detergent and water (approximately 2500 gallons), the other was empty. We pressurized the full truck and pulled vacuum on the other, moving the cleaning agent through the piping at a high volume and high velocity.

The flow was then reversed from one truck to the other. This was done several times. The pipe was rinsed then vacuumed dry. The final test resulted in a non-detect level. The line was cleaned in less than five hours.