The original plant had been in operation for many years, and the client was anxious to upgrade and incorporate modern condensing appliances to improve economy and minimise emissions. Further energy savings were realised by decentralising some of the central-heating and hot-water loads, and replacing calorifiers with plate heat exchangers and buffer vessels.
Four modulating condensing boilers, each with a maximum output of 1000 kW, were specified by consulting engineers EDP of Livingston.
The boilers are individually vented by 600 mm-diameter Supra flues discharging at a height of
11.5 m.
Supra flues have a single-skin stainless-steel construction and incorporate seals for moisture tightness. They are designed to provide pressure resistance up to 1000 Pa. Their light weight enables them to be run vertically externally and fixed to walls.
