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Case Study: Laggan Tormore - Steel Demountable Tanks with Impermeable Liners The liquidtight liners for these tanks were manufactured in our UK factory to the high standards required for the
petrochemical industry and military / Emergency Aid specifications.

The liner selected was 1.00mm Butyl Rubber with grade A recommended chemical resistance to the
Mono-Ethylene Glycol to be stored. Bespoke Butyl rubber sleeves were designed and supplied to protect the
galvanised iron roof supports from the tank contents.

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.

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

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

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

• Containment of the Glycol through choice of appropriate lining material
• Environmental standards to be very high as agreed with Shetland Islanders
• Rapid deployment required to meet project critical path
• Safe removal of all eqipment when main storage facility came online

Challenges: Special consideration was given to the adverse weather conditions frequently experienced in the Shetland Isles, Deployed tanks with secondary containment (blue PVC) bund lining visible on the left
high winds, heavy rainfall and snow.
The tank structure was uprated to accommodate this, with a steel roof option also designed to resist the weather
conditions, particularly snow loading.

Our Solution: 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.

Page 23 Case Studies: Steel Storage Tanks