Although the Boulting Group report had no further contractual obligations attached and Thames Water was free to commission a different contractor to implement any improvements, the deep-rooted collaboration with Pump Management and previous successful projects prompted Thames Water to assign the engineering, design, procurement and implementation contracts to the Boulting Group.
To improve the hydraulic performance and the priming process, Boulting Pump Management suggested a pump upgrade, including a complete redesign and manufacture of the pump impellers to help improve the net positive suction head (NPSH) characteristic and pump efficiency.
The specific design Boulting created for this project allows an improvement to 87% pump efficiency and increased reliability during start up and operation.
To resolve the issue, the Boulting Group suggested the installation of a new and automated priming system that uses motive air vacuum ejectors and continuous water level monitoring.
To further increase priming reliability, the Boulting Group replaced the old packed glands with mechanical seals.