Chemical Treatment of Offshore Pipeline Hydrotest Water Unnecessary

June 2017, Vol. 244, No. 6

By Graham Collier and Edmond Jung, UniversalPegasus International, Houston

UniversalPegasus International (UPI) was contracted as an owner’s engineer by an operator in the U.S. Gulf of Mexico (GOM) to provide detailed engineering design, during installation and pre-commissioning. The operator’s field, located in Mississippi Canyon, required a subsea pipeline from a well cluster at a depth of about 2,600 feet, tied back to a host platform in 650 feet of water depth. The operator required up to a three-month gap between pipeline flood/hydrotest and dewatering. Design, construction and installation included a riser for the platform, about 22 miles in length, with an 8-inch outer diameter…

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