KDC completes demolition of 33rd and 34th gasholders at SGN, Johnstone site
Following the discovery of North Sea Gas in 1965, the requirement for gasholders has been on a steady decline, resulting in the UK’s gas distribution networks undertaking programmes of gasholder demolition works through specialist subcontractors.
Over the past 7 years, KDC have carried out the demolition of gasholders across 25 sites for all of the UK gas network providers (SGN, National Grid, Northern Gas Networks and Wales & West Utilities).
The recent completion of the safe demolition of 2 gasholders for SGN at their Johnstone site marks the 33rd and 34th gasholders demolished by KDC. It also makes a total of 6 gasholders demolished by KDC for SGN.
The first gasholder was of below ground, spiral guided construction with four lifts of riveted steel and a brick and puddled clay tank and had stood for over 82 years.
The second, built in 1913, was an above ground, spiral guided holder with two lifts of riveted steel and a steel tank.
Close stakeholder relations were required on the project to allow access to the site through WH Malcolm’s warehousing facilities.
Approximately 8540m3 of water was treated on site and 260m3 of sludge was removed from the tanks. This was followed by remote demolition using 360 degree tracked excavators equipped with a multi-processing shear, tank shear and grapple for loading arising into skips.
KDC’s specially designed and commissioned ‘long arm’ attachment allowed demolition activities to take place at depth, precluding machine or man access to the below ground holder tank.
The holder voids were infilled with recycled, non-hazardous waste from the demolition process (approximately 6720 tonnes) and reclaimed inert wastes, using SEPA exemption, for best environmental practice.
“I must say that it looks fantastic and what a very good job you have done there from start to finish, a very commendable, professional job, well done to you, Greg and your team.”
- Mike O’Shea - Project Manager, SGN
You can view the time lapse footage of the demolition here.