Surface Water Chamber Refurbishment

CSC Services has used a cementitious coating system to refurbish a surface water drain chamber at Dungeness B Power Station for client EDF Energy.

The chamber forms part of the surface water drainage system and is also the authorised minor discharge route for waste condensate water being discharged from the power station. Although the chamber was intact, there were voids in the mortar and cracking around pipe penetrations. The defects needed to be repaired to ensure environmental compliance is maintained. A protective lining was required that would tolerate the heat from the water being discharged.

CSC Services repaired the chamber and lined it with Cemprotec E942 from Flexcrete. This water based cementitious system gives a hard, durable coating with excellent resistance to water, chloride ions, oxygen and aggressive chemicals. A key benefit is that it can be used as a stand-alone anti-corrosion coating for ferrous metals as well as waterproofing and protection of concrete where enhanced chemical and abrasion resistance is needed.

The drain was blocked and allowed to dry before work could commence. CSC Services also installed an over-pumping system to isolate the chamber.  It was imperative that the specified coating had a rapid curing time to allow the speeded return to service of the surface water drainage system.

“CSC Services worked with EDF Energy’s Investment Delivery team in recommending and agreeing suitable products for the chamber refurbishment. The work required confined space access and was subject to plant isolation, which was delayed by one day. Despite the delay, CSC Services completed the work to a very high standard and within programme.”

Images from the work undertaken are shown below. For more information about the range of services offered please visit

General condition of the chamber before the cementitious system was installed

Cemementitious coating system at Dungeness B Power Station

The chamber as the cementitious system was installed