Bellozanne STW Rising Main Lining

The lining product used was Applied Felts’ AquaCure, a hybrid glass-reinforced felt liner. This product was selected because it was able to meet the exacting requirements of the scheme. The liner used was just 25mm thick, but is specified to withstand 10 bar operational pressure. The stretching properties of the liner ensured a very close fit with the host pipe. Furthermore, the liner has the chemical resistance necessary to protect against sewer effluent elements.

The installation took place using the inversion technique. Curing method differed across sections – some areas using hot water and some using steam. The largest single length of installation in one inversion/cure was 284m.

Working on a scheme of this scale and complexity would usually require very detailed logistical planning to ensure that personnel, machinery and materials are on site at the correct times. However, this requirement was exponentially increased owing to the site’s location in the Channel Islands.

Months of planning went into ensuring that all elements were in place to enable to the project to be a success. Close cooperation with our supply chain helped this to happen. Vehicles, plant and equipment were sent to the island by ferry, with remaining staff and operatives travelling by air.  

The team faced additional major challenges owing to COVID-19, and the strict quarantine laws introduced by the States of Jersey. This added the major complication of having to isolate personnel in hotels prior to their admittance to site. 

On-site liaison and cooperation with our client and other contractors was of paramount importance to ensure the progression of our works whilst integrating with the works of others. Informal daily meetings and formal weekly meetings took place to coordinate activities. We also used videoconferencing extensively to maintain close liaison with client contacts and stakeholders based remotely from the site.