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DNV unveils anti-pipeline expansion concept

12th March 2013

DNV launches SliPIPE, a cost-effective concept to deal with pipeline expansion caused by high pressure and high temperature

DNV unveils anti-pipeline expansion concept
A cut-out view of a SliPIPE in 3-D

DNV has developed a new concept – SliPIPE – to prevent pipeline expansion during the transportation of oil and gas from high pressure and high temperature (HPHT) reservoirs.

SliPIPE consists of an outer pipe connected alongside a pressure chamber and an inner pipe that can slide inside them. It reduces the end force expansion at the tie-in by absorbing the end expansion as it slides within itself, the Norwegian classification society said in a press release. It also reduces or eliminates the effective axial compressive force in the pipeline.

“Between the outer pipe/pressure chamber and the inner pipe of the SliPIPE concept are two main seals, a partition wall seal, an environmental seal and a scraper seal. The seals are made of materials that allow them to function at high temperatures and pressures,” DNV said.

Pipeline expansion occurs due to high pressure and high temperature, causing axial displacement or other pipeline movements which may lead to failures.

Traditional responses to pipeline expansion include dumping rocks along the pipeline or installing a giant spool. However, DNV claims SliPIPE is less difficult to install and reduces the costs of post-installation intervention work.


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