Listed buildings
Old meets new at St Paul’s
The prestigious St Paul’s Cathedral has been standing at the highest point of London on Ludgate Hill since its latest rebuild over 300 years ago. As a Grade 1 listed building, the delicate building structure is subject to strict regulations, prohibiting alterations without special permissions. When the cathedral’s boilers failed, it meant a heating and hot water plant refurbishment project would have to take those restrictions into account. The challenge was met by Hamworthy Heating which provided a modular boiler system and two high performance calorifiers
T
he cathedral’s existing heating system consisted of three steel shell boilers fitted in the 1960s which
received a burner upgrade in the 1980s. Problems on the equipment occurred and were fixed until the boilers finally started leaking and could not be repaired anymore. At this point, Robin Bunton from Bunton M & E Services advised replacement boilers were necessary. Together with Mike Crouch, Hamworthy’s agent for the area, and Nick Coates from Blue Print Building Services Design, he worked on the specification for the cathedral’s heating and hot water refurbishment project with Clerk of Works Martin Fletcher.
The right solution
The cathedral was seeking reliable and energy efficient boilers to meet its high heating and hot water demand while keeping the running costs down. To avoid changing the flues, the cathedral initially planned to replace the older system with pressure jet steel shell boilers. Robin, however, recommended Hamworthy’s Wessex ModuMax mk3 condensing modular boilers to meet the reliability and energy efficiency requirements, as well as compliance with current legislation to eliminate inefficient boilers. He comments: “We have used the
Wessex boilers since they were introduced
and we know they are a very reliable product. They are space saving, great in refurbishment projects and buildings where you can’t change the building fabric, such as St Paul’s. Hamworthy also has an excellent after sales and spares service, with its own engineers, which is why I prefer working with them.”
Old pipe system preparation
Six months prior to the installation of the boilers, two MagnaClean filters were installed to clear the heating system from sludge and debris, followed by a system flush. To create hydraulically separate systems from the new boilers to the
40 June 2017
www.heatingandventilating.net
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