Enviro Process Engineering

Enviro Process Engineering (HK) Co. Ltd.

安和環保工程(香港)有限公司

Case Studies :Grit pump for Scottish Water

EMS has supplied a VRM175 ram pump on a trial and evaluation basis to Scottish Water’s Shieldhall STW in Glasgow to pump grit from the six grit channels of the works inlet.

The VRM175 pump is mounted upon a travelling bridge above the grit collection channels. The grit lies at the bottom of the channels approximately 5-6 metres below the suction inlet valve of the pump. The grit is drawn through flexible hoses that reach to the bottom of the grit channels. The VRM175 pump has been specially kitted to overcome the rapid settlement of the grit inside the pump as it operates and the 5-6 metres negative suction head to be overcome each time the pump starts.

In practice, the pump accommodates the abrasive nature of the grit and the rising and falling levels of grit and water in the channels without complaint. The pump has been found to be self-priming at all times, irrespective of the water level.

Many pumps have been trialled on this application in the past, most have been destroyed by the grit and none have been successful. On the strength of the success of the pump, Scottish Water are proposing to install three, larger, VRM250 pumps on the bridge, whereby each pump will be PLC controlled to automatically de-grit two channels consecutively.

Other job references

De-sludging Primary Tanks at Leeds

Roundhill S.T.W – Thickened Sludge Ram Pumps


VRH250 pumps installed at Hardham	VRH pump at Lingfield STW	VRH pumps installed at Lowestoft


VRH250 and auto-desludging at Aldershot	VRH pump at Lingfield STW	EMS valves fitted to other pumps


VRM250 at Itchen Bank STW	VRH250 at Aldershot	Hydraulic cylinders for Restormel WTW pumps