Subsea Pipeline Tie-In

Flexible configurations and designs, with one or more tie-in points

An extensive range of pipeline tie-in structures includes pipeline end terminations (PLETs), pipeline end manifolds (PLEMs), and inline tees.  Pipeline tie-in structures can be configured in a variety of ways to satisfy specific field requirements.  PLETs, PLEMs, and tees can incorporate one or multiple tie-in points, vertical or horizontal, with other OneSubsea OEM components such as isolation gate or ball valves, diverter valves, pig-launcher facilities, an array of sensors, or wyes.  Designs can incorporate features to suit any installation method or vessel.

Subsea flowlines are used for the transportation of crude oil and gas from subsea wells, manifolds, off-shore process facilities, loading buoys, S2B (subsea to beach), as well as re-injection of water and gas into the reservoir. Achieving successful tie-in and connection of subsea flowlines is a vital part of a subsea field development. Subsea fields are developed using a variety of tie-in solutions.

Vertical Tie-in Systems

Vertical connections are installed directly onto the receiving hub in one operation during tie-in. Since the Vertical Connection System does not require a pull-in capability, it simplifies the tool functions, provides a time efficient tie-in operation and reduce the length of Rigid Spools. Stroking and connection is carried out by the the Connector itself, or by the ROV operated Connector Actuation Tool (CAT) System.

Horizontal Tie-in Systems

Horizontal Tie-in may be used for both firstend and second-end tie-in of both flowlines, umbilicals and Jumper spools. The termination head is hauled in to the Tie-in point by use of a subsea winch. Horizontal Tie-in may be made up by Clamp Connectors operated from a Tie-in tool, by integrated hydraulic connectors operated through the ROV, or by non-hydraulic collet connectors with assistance from a Connector Actuation Tool (CAT) and ROV. Horizontal connections leave the flowline/ umbilical in a straight line, and is easy to protect if overtrawling from fishermen should occur.

Reference

• http://www.onesubsea.com/products_and_services/production_systems/subsea_manifolds/pipeline_tie_in_structures.aspx
• http://www.fmctechnologies.com/~/media/Subsea/Technologies/TieInSystems/Colleteral/Subsea%20Tie%20In%20Systems_low%20res.ashx?force=1&track=1