Pipe In Pipe

Pipe in pipe

A pipe in pipe (PIP) is a pipe inserted inside another pipe.Over the past two decades, the pipe-in-pipe (PiP) product has become an essential part of the subsea field development engineer's "tool box". Due to its high insulation performance it minimizes heat losses from the transported fluid to the environment that more traditional subsea coatings cannot provide. This is achieved using thermal insulation of very low thermal conductivity, such as aerogel, encased in dry atmospheric conditions between the inner pipe or "flowline," which transports the fluid, and the outer pipe or "carrier," which provides the mechanical protection from the subsea environment.

 Other benefits of the PiP solution include compatibility with high temperatures (in terms of material and enhanced compliance with large axial loading), stability on the seabed, and protection by the outer pipe against external loads. In some cases this may obviate the need for burial.

 

Pipe in pipe.

Source : http://www.itp-interpipe.com/images/pipe-in-pipes/pipe-in-pipes.jpg

Pipe-in-Pipe are suited for shallow, deep and ultra deep water as well as HP/HT fields.
1. Pipe-in-pipe for shallow and deep water applications

Pip system are particularly  well suited for shallow, deep and ultra deep offshore projects:
- The pipe in pipe structure  accommodates large hydrostatic pressure.
-  Due to the low thermal conductivity of Izoflex^TM, only a thin layer of insulation is required to obtain highly insulated systems, which reduces the outer pipe size and thickness, thus reducing weight and costs (less welding time, less steel).
 -  The compact & efficient insulation allows long tiebacks and long cooldown time.
 - For J-lay & S-lay, the specific ITP Field Joint (FJ) allows a quick offshore installation (one single weld offshore).
- The ITP single/double/quad joint design offer integrated water stop and buckle arrestor every 12/24/48 metres.

2. High Pressure/ High Temperature





Daftar pustaka :
http://www.offshore-mag.com/articles/print/volume-75/issue-2/pipelines-flowlines/pipe-in-pipe-technology-adapts-to-changing-needs-in-deep-and-shallow-water.html
http://www.itp-interpipe.com/products/pipe-in-pipes/pipe-in-pipes.php
http://www.itp-interpipe.com/