Outline of Requirements

We received an initial approach from the consultant acting as designers for the Water Authority to provide technical assistance in preparing a design for upgrading the discharge from the site from around 10l/s to 37l/s to alleviate surcharging / flooding during storm conditions of surrounding properties.

Design and subsequent installation works to be carried out under partnering agreement between Pims Pumps /The Water Authority and the consultant.

Constraints placed on the design by the capacity of the receiving treatment works resulting in normal Day to Day dry weather flows (DWF) from pump station were not to be increased but under storm conditions discharge to increase to 37l/s.

Further constraint placed on us in that any modification works to station must be contained within the confines of an already limited space.

Site investigations were carried out to ascertain existing level of equipment and space available. Pims then involved with ongoing design works and meetings to formulate a solution

Various designs were considered to arrive at a solution that best fitted the Water Authorities Constraints and those of the space available.

Pims Pumps Proposal

The final solution comprises of a 3 pump system with 2 DWF pumps operating on a duty / standby basis discharging around 9.5l/s down the existing 100mm rising main and a third storm pump discharging around 27.5l/s in storm conditions through a new 200mm OD PE pressure pipe.

Pims meetings with the Water Authority operations highlighted a requirement for flexibility in using both rising main with a combination of pumps in emergency’s and a pipeline design in the pump station was undertaken to provide this facility.

Once design finalised Pims pumps project managed preparation of a surge analysis report for both the existing and new rising mains.

Benefits to Client

One stop shop for client for design works, surge analysis, procurement of equipment, installation and commissioning.

Partnering enables parties to pull together and arrive at a solution that best suits the clients technical and financial objectives.

Specialist design appraisal of available options and advantages / disadvantages of each.