Project: Bermondsey CCU Replacements Location Bermondsey Underground Station Client Transport for London Date Nov. 2019 - July 2020 Download full PDF case study

Introduction
London Underground identified a number of Jubilee Line stations in which the existing Edenaire HVAC units were beyond economical repair. We were awarded the contract to replace these units with new Airedale models, improving the reliability and sustainability of the station’s critical assets.

Project Deliverables
Our mechanical engineering team at Bermondsey replaced HVAC units across nine critical equipment rooms within the station. Working within these rooms required our engineers to hold London Underground’s QAF (Equipment Room Awareness) certification.
The team initially obtained water samples for analysis, which determined the flushing and filtration requirements. They then stripped-out and retained the existing Edenaire unit components (e.g. fan decks and compressors) to service other HVAC systems across the LU network. 13 of these units were then replaced with the new Airedale models, along with associated electrical works, isolators, valves, trunking, drains and pumps.
The two units within the redundant ticket office were no longer required. These were removed by our engineers and pipework was safely disconnected from the circuit to avoid future maintenance issues.

Challenges and Solutions
The first technical challenge faced by our engineers was the installation of HVAC units with a new design and specification. This required ongoing collaboration with the manufacturer Airedale. We secured a visit to the Airedale factory in Yorkshire, gaining valuable insights which influenced our logistical approach and installation methodology.
Another challenge lay in safely navigating the large and heavy plant through the confines of the sub-station, which lies 14m below ground level. We partnered with our strategic logistics partner Radius, which provided a range of innovative plant-handling equipment including Long Sack Barrows and Escalator Sledges. The Escalator Sledge (see diagram 1, right) enables a load of up to 450kg to be secured to a flat platform, and moved safely down an escalator with the weight evenly distributed across five step levels.

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