Special Products & Projects

Black Sea

Two pipelines have been laid across the Black Sea. To prevent upheaval of one of them due to forces from thermal expansion, we supplied concrete log blankets for installation at the junction of the Russian continental shelf and the deep basin. Due to the slope of the sea bed at this point they were placed at an angle of between 4 and 22 degrees, and so required anchoring.

In our elegant solution steel blades were used on the log blankets to provide lateral resistance by penetrating the very soft soil. The blankets were made heavy enough to ensure full penetration of the blades yet light enough not to cause excessive settlement into the soil.

Nova Scotia

Design and manufacture of fabric formwork bags for Bluestream NL for ExxonMobil on the Sable Field Nova Scotia.  A six legged jacket structure had scoured around the bases of all the legs and the only connection between the piles and jacket were the top welds.  This gave rise to the phenomenon of a "ringing platform whereby the base of the jacket moved to strike the piles  in the swell and acted somewhat like a bell.  The special Fabric Formworks designed and manufactured in house provided a grout stop at the base of the platform leg to permit the annulus between the pile and jacket leg to be grout filled.  Although all legs were eventually sealed, even after the completion of one leg it was reported that platform had stopped moving.

Dalton Millom Structures

We were asked to design a spool piece protection structure that would accommodate the rotation of a wellhead and associated movement of the spool piece. The design had to be small enough to transport by road and to install with available cranes, yet also had to be able to resist loads from striking trawl boards.

We designed and manufactured a structure that could be transported and installed in sections, but that when mated together was strong enough to resist the specified impact loads.

Caravel-L09  North Sea

Supply of concrete fronded blankets to Shell Expro for scour prevention around four mono tower structures on the Caravel-L09 Project platforms.  Installation by HLV using a multiple mattress lift frame to install 28 mattresses in one operation

Design and manufacture of wet store frames as well as supply of stabilisation blankets for the Caravel-L09 Field spool pieces and pre-lay and post-lay mattresses and blankets for all the pipeline crossings.