ContraTherm® C55 shrouds insulate complex subsea structures

Our client required insulation for subsea gas field structures. The insulation needed to be removable to enable maintenance work so an engineered covered solution was preferred to standard wet insulation. ContraTherm® C55 shrouds provided the insulation performance and mechanical properties required.


The highlights

Range of insulation parts

12 specific equipment parts were insulated, requiring 48 different insulation parts.

Over 215 kgs

Weight of the largest single part.

1.5m x 1.6m x 1.6m

The dimensions of the largest part.



AIS was responsible for the thermal and mechanical design of the insulation covers, which were applied to SSIV gate valves, anchor flanges and double block sensors sized for both 8” and 20” pipes.

Sealing systems were fitted at each joint within the insulation system to prevent heat losses between components and between the shrouds and the structures themselves.

AIS’ bespoke pressure relief valve system was incorporated into each structure to enable equalisation of hydrostatic pressure after subsea installation. Strapping systems secured the insulation shrouds in place and integral lifting eyes were provided in each shroud to aid safe handling.



“We are very impressed with the performance of AIS. You have been a very easy subcontractor to work with, and your well organised, flexible and proactive approach has been appreciated by all involved.”

Client Buyer



We delivered the shrouds to site where an AIS engineer oversaw the safe installation of each piece onto the SSIV structures.

From design through to delivery and installation we ensured our client was provided with a seamless insulation solution that met the flow assurance requirements, despite a very short schedule with significant time constraints.

Success stories

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