Description: Browns Point Valve Actuation
Client: JN Bentley
Date: March 2014
Discipline: Electrical Installation
NWL’s Browns Point SPS is a 3 pump dry well sewage pumping station located in Cullercoats, Tynemouth. The station was prone to blockages meaning that NWL operators were required to mechanically isolate the pumps to de-rag. The existing manually operated knife gate valves were fitted with Rotork electric actuators by a 3rd party with the electrical works undertaken by Intelect UK Ltd, these improvements greatly increased efficiencies when de-ragging and thus reduces the time spent carrying out the works.
The picture to the left shows one of the six knife gate valves prior to having its electric actuator fitted. The works were initially sequenced such that the mechanical contractor would complete his activities prior to the start of the electrical works.
In the event the sequence of works changed, the mechanical contractor encountered difficulties in removing the flange bolts. This delay caused an impact on the overall programme as JN Bentley had site establishments and site management in place for a finite duration.
As a result we came in early and installed the containment, cabling and local isolators prior to the mechanical works, once the mechanical contractor finally completed his works we returned to site to complete the cabling between the local isolators and the electrical isolators.
The picture to the right shows one of the modified valves incorporating the electric actuator, local isolator and containment along with power cabling, labels and earth bonding.
During the NICEIC testing it became apparent that there were departures from BS7671, Specifically it was not physically possible to identify the protective bonding conductors to the water services pipework and structural steelwork. As a result we were unable to issue an electrical installation certificate, in lieu we issued a schedule of electrical test results along with a report outlining necessary improvements to be undertaken by the owner.
To conclude although the installation did not go entirely to plan the works were still completed within the required timeframe, no health and safety issues arose and resources were efficiently redeployed and returned to bring the project in on budget.
JN Bentley has been one of our NWL clients over the last 8 years and continues to award Intelect UK Ltd major framework projects. We have worked on various projects ranging from small pumping stations refurbishments through to new water treatment processes.