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SLD completes project at Scottish wastewater treatment plant

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SLD Pumps & Power has completed a major project at a large wastewater treatment plant near Glasgow in Scotland, enabling critical repairs to be carried out.

The company’s high-capacity pumps diverted millions of litres of wastewater, allowing engineering to inspect worn channels and structures downstream to assess what repairs were needed.

SLD deployed 12 high-capacity pumps: eight Hushpac CD225 pump-sets and four large Flygt N-type submersible heavy-duty sewage pumps. The units were placed around existing balance chambers connected to six large primary settlement tanks.

Space restrictions within the chambers required a mixture of large electric submersibles and diesel-powered end-suction pumps.

Sufficient pumping capacity was needed to meet a constant flow of around 1,020 litres per second, with additional standby capacity of 464 litres per second, giving a total required capacity of nearly 1,500 litres per second.

Following deployment of the pumps, delivery pipework was assembled by the contractor using existing standard rental fleet pipework, with the pumps connected via manifolds and isolation valves fitted to allow for maintenance.

Each pump was powered by two temporary SLD generators, with automatic mains failure to achieve the standby unit in the case of failure. Both diesel-powered and submersible electric pumps were arranged to operate automatically on level floats.

“A significant benefit of using such a multi-pump system is that each diesel pump operates independently as a stand-alone unit,” said Lisa Tweedie, SLD’s area sales manager, who led the project. “The system provides a high level of resilience not possible with interdependent approaches. The pumps were also fitted with telemetry units, enabling us to remotely monitor any alarm conditions. This enables us to respond immediately in the unlikely event of a problem and quickly rectify the situation.”