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Diverless Pipe Lift Frames (DPLF) are installed over pipelines on the seafloor using ROV assistance. The DPLF is lowered on a four-part sling from the surface. An ROV guides in down so that the pipe guides straddle the pipeline. The ROV then actuates the torque bucket using a standard torque tool to lower the pipe clamp. The pipe clamp self-opens on the pipe and then locks closed. The ROV then actuates the torque bucket to raise the pipeline off the seafloor.
DPLFs can be used to lift a damaged pipeline for placement of explosive charges needed to remove the damaged section and then lower it to the seafloor for detonation of the charges.
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DPLFs are also needed to lift and hold pipeline ends for installation of various diverless components: the HydroTech Pipe Recovery Tool, a diamond-wire cutting unit, the HydroTech Grip & Seal HydroCouple, the HydroTech HydroClamp diverless repair fitting, and the HydroTech HydroTap diverless hot-tap system.
After use, DPLFs are recovered to the surface. The ROV hooks up the four-part sling to the lift line, then actuates the torque bucket to run the pipe clamp fully down, and finally pulls levers to open the clamp and release the pipeline.
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To view the Diverless Pipeline Lift Frame Contacts, click on the corresponding link below:
Diverless Pipeline Lift Frame Contacts
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Oil States Industries, Inc.
Oil States International, Inc.