Humber Bridge - Dehumidification
Drawing on Spencer’s expertise in main cable dehumidification on
suspension bridges, Spencer performed the main cable inspection and
the subsequent dehumidification of suspension bridge main cables for
the Humber Bridge Board on the Humber Bridge
Facts and figures
2,200m long Humber Bridge
Working at a height of 155m
Solution implemented without
the need to stop traffic flow.
The world’s largest project of its kind: Following a successful contract to inspect the Humber
Bridge’s main cables, Spencer was awarded the contract to design, supply, test, install and
commission the main cable dehumidification system on the 2,200m long Humber Bridge (the
fifth longest of its type in the world).
The system was designed as a means of intervention to halt the ongoing natural corrosion of
the main cables. A key part of the project involved wrapping the cables with a proprietary
material to create an air-tight environment, which involved significant work at a high level
above the bridge deck in a salt water environment and occasionally adverse weather
The project involved installation of new hand wires and the installation and commissioning of
all plant and equipment. The finished system injects dry air into the cable at a number of
locations to prolong the life of the bridge.
Delivering bridge-saving technology overseas: Spencer has become the world leader in
dehumidification projects, having undertaken all these works on suspension bridges within the
United Kingdom. We have also undertaken main cable inspection and dehumidification projects
internationally, the most recent of which being the main cable dehumidification of the Alvsborg
Bridge near Gothenburg, Sweden.