Pressure Reduction Installation (PRI) 2006/7
Rush Construction Services were major contributors to a recently successful project carried out by National Grid, where, in preparation for a reinforcement of the gas supply to West London, a new Pressure Reduction Installation has been built.
The new PRS is innovative in a number of ways: The design is the first in the UK to have below ground – no maintenance – regulators. This has meant sound attenuation is excellent and noise has reduced considerably – important in an urban environment with development potential close by. Coupled with no joint breaking for maintenance, this is a serious step forward in PRI design.
It performs to high standards whilst having a bifurcated – and switchable – inlet pressure regime of either 33 or 27 barg, due to inlet supplies being from two sources. This ability to switch between alternate supply systems enables the network operator to maximise available diurnal storage capacity by ‘linepack’ which frees up conventional storage by low pressure gas holders.
Being an old (1850s until 1970) gas-producing works meant there was potentially serious contamination present. RCS were part of the team, during construction, which ensured that no contaminated material left site. All contaminated spoil was treated with bio agents to make it acceptable for re-use as backfill material. We believe strongly that taking contaminants offsite merely transfers the problem to someone else and is environmentally unsound. The project received commendation for its environmental aspects.
We were pleased and proud to have been associated with the project, providing all aspects of Design, Quantity Surveying, Site Supervision and CDM Planning Co-ordinator services to National Grid Gas.