Tank Installation – Shetland isles

Summary

Project: Supply & Install Glycol Storage for Laggan Tormore North Sea Gas Terminal

Location: Laggan Tormore North Sea Gas Terminal

Customers Name: Halliburton Pipeline & Process Services on behalf of Petrofac Ltd.

The new Laggan Tormore Gas terminal had a requirement for 4,500,000 litres of Mono-Ethylene Glycol to be safely stored on a temporary basis. Design considerations included:

•Containment of the Glycol through choice of appropriate liner material.

•Secondary containment Bund Linings to prevent spills and ground contamination

•Environmental standards to be very high as agreed with Shetland Islanders.

•Rapid deployment required to meet project critical path.

•Safe removal of all equipment when the main storage facility came online.

Challenges

Special consideration was given to the adverse weather conditions frequently experienced in the Shetland Isles, high winds, heavy rainfall and snow.

The tank structure was upgraded to accommodate this, with a steel roof option also designed to resist the weather conditions, particularly snow loading.

The liner selected was 1.00mm Butyl Rubber with grade A recommended chemical resistance to the Glycol to be stored. Bespoke Butyl sleeves were designed and supplied to protect the galvanised steel centre support pole from the tank contents.

Results

Despite challenges with adverse weather the project was completed on time and to the satisfaction of the client.

The tanks offered have a structure built from galvanised, corrugated steel panels which are curved to form the required diameter and punched to accommodate the correct number and layout of fixings to meet EU standards for this type of storage tank.

Each of the 9 tanks measured 11.98m diameter x 4.60m high to meet the capacity requirement.

The watertight liners for these tanks were manufactured in our UK factory to the high standards required for the petrochemical industry.  The tank roofs were designed to be transportable in kit form and were supplied complete with lockable inspection manways.

The tanks have five decades of service history and have been widely deployed in the UK and overseas, wherever secure storage of liquids is required for short or long term.