Exxon Co. U.S.A.'s Harmony-Heritage pipelay, offshore California, was the site in late 1998 for the first use of Coflexip Stena Offshore Inc.'s MJ-Lay (modular J-lay) spread. Coflexip's CSO Constructor served as lay vessel. The project was in approximately 300 m of water laying a 12-in., 13-km line between the two platforms. It was initiated with a J-tube pull and terminated with a steel catenary riser (SCR). The modular system can install pipe up to 14 in. ID to an SCR in water as deep as 1,500 m. Coflexip Offshore says the ability cost-effectively to build in situ to an SCR is a particular feature of this spread.
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