1. To find a depot near you, visit mabey.com. (800) 956-2239 | info@mabey.com
Mabey’s shoring system stabilized
cofferdam on Loch Ryan harbor for
new pipeline to protect Scotland’s
only natural oyster bed.
LOCATION Port Rodie, Stranraer, Scotland
SPECS Twin-level bracing and bracing struts
PURPOSE Wastewater system replacement
CASE STUDY
MABEY SYSTEM:
Super Powerbrace Plus
Bracing System

2. CASE STUDY: Port Rodie, Stranraer, Scotland
To find a depot near you, visit mabey.com. (800) 956-2239 | info@mabey.com
The Challenge
Stranraer is the second largest town in the rural landscape of Dumfries
and Galloway and it sits on the bank of Loch Ryan, a sea loch humming
with Scotland’s only natural oyster bed. In 2012, the wastewater system
for Stranraer and the surrounding areas was deemed outdated and in
need of replacement. Situated at Port Rodie on the harbour front, the
wastewater treatment works (WwTW) for Stranraer is a primary treat-
ment facility with underground settlement tanks and no sludge treatment
facilities, which led to water being discharged into Loch Ryan.
The Solution
In one of the final operations of Scottish Water’s project, they were to
construct a new pipe to transfer final effluent to the Irish Sea, removing
completely the discharge to Loch Ryan. Mabey was contacted by sub-
contractor George Leslie/MWH JV to design a frame for the cofferdam,
located in the sea close to the harbor wall. The frame was required
to withstand a customer calculated loading of 14,458 lbs/ft; this was
achieved by using Mabey’s Super PowerBracePlus. Twin level bracing
was installed at 105’ long by 17’ wide, along with eight bracing struts
over five days.
The Result
Mabey and ABCO Maine Ltd. worked day and night to complete the
installation around the flow of the tide. A 32” diameter pipe was bored
from the harbor out under the railway and then into the cofferdam. The
pipe was approximately 3’ below the finished level in the cofferdam and
it was then turned 45 degrees and out in to the loch.
The contract period experienced some bad weather conditions, causing
crews to stand down when it was too dangerous to work. However, the
project remained on course and was removed within two months.
For more case studies or information, please visit mabey.com.
Mabey Inc.
A Leader In Shoring, Bridging
and Construction Rentals
800-956-2239
www.mabey.com
info@mabey.com
“The Customer Product Special-
ist provided not only useful but
invaluable design input to install
the frame to what was a revised
cofferdam. Very impressed and
would recommend in future.”
– Stevan Foster,
Project Manager
ABCO Marine Ltd