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Oil States diverless Grip & Seal Hydraulic Couplings (GSHCs) are installed over the end of bare pipe to provide a structural connection point. The connectors can be installed on a cut pipe end that has had concrete weight coating and any other coating, such as somatic and coal tar enamel, removed. When actuated, GSHCs structurally attach to and seal against the pipe. GSHCs are used to permanently connect high-pressure pipelines, flowlines, and risers for both deepwater pipeline repair and new construction projects. |
Diverless Grip & Seal Hydraulic Coupling
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Grip & Seal Hydraulic Couplings attach to the pipeline, flowline, or riser using wedge-shaped slip segments, or collet grips, positioned radially inside the body. The collet grips are contained between the pipe OD and an outer wedge-shaped bowl, causing them to be self-energizing; the higher the tension or compression force, the tighter they grip the pipeline. For most applications, GSHCs utilize dual-acting collet grips to support both tension loads (thrust effects of internal pressure and externally applied tension loads) and compression loads resulting from pipeline thermal expansion or other causes.
The sealing system consists of two stacks of elastomer packers. When axially compressed, the elastomer packers flow radially inward against the pipe OD and outwardly against the connector body. The elastomer seals are backed up by metal guard rings that prevent seal extrusion. A pressure-test feature is provided for verifying the seal after setting and installation. This is accomplished by pressuring the annulus space between the two packing stacks.
An ROV actuates the collet grips and seals and tests the seals via an ROV panel.
When pipeline operating temperature is unusually high compared to the water temperature, it may be necessary to provide the GSHC with our temperature-compensated sealing system. This patented mechanism regulates the pressure fluctuations in the packers to a range that will neither damage the pipe due to excessive pressure or result in a seal failure due to loss of sealing pressure. In most cases, however, the GSHC and pipe are sufficiently elastic to self-compensate for seal expansion and contraction due to temperature fluctuations.
Grip & Seal Hydraulic Couplings are available in sizes and pressure ratings ranging from 3 inch/API 10,000 psi to 48-inch/ANSI 600 Class. Almost any variation of pressure rating is available, and the connectors are available in configurations with other connectors and fittings.
Oil States Pipeline End Connectors meet the requirements of API 6H and are designed in accordance with ASME Pressure Vessel Code, Section VIII, Division 2, unless otherwise specified. Anodes for cathodic protection are designed for a 20-year service life in accordance with DNV Rules for Submarine Pipeline Systems. HydroTech End Connectors can also be supplied to meet the requirements of other recognized design codes.
Please provide the following information on any purchase order or request for quotation:
• Pipe wall thickness or bore
• With or without telescoping adjustment |
Oil States Industries, Inc.
Oil States International, Inc.