Enviro Process Engineering

Enviro Process Engineering (HK) Co. Ltd.

安和環保工程(香港)有限公司

Case Studies : SEVERN TRENT WATER

ROUNDHILL S.T.W THICKENED SLUDGE RAM PUMPS

EMS has recently supplied and installed three VRH350 ram pumps to pump thickened sludge from two Picket Fence Thickeners.

Original peristaltic pumps

The original pumping installation comprised of three peristaltic pumps that were having difficulty pumping the heavy sludges being produced by the thickeners. EMS installed a trial ram pump initially to prove the capability of the EMS pump this proved to be successful. Orders were then placed for three VRH350 ram pumps.

The VRH350 specified for this project was the VRH350/10/650, which will deliver 650 l/m @ 10 bar sludge pressure.

EMS VRH350 hydraulically driven ram pumps.

The system has been designed with special features that make it unique amongst other pumping installation in the UK. The system electronically monitors the discharge pressure and suction vacuum of the pumps. The system checks the data from the sensors and adjusts the pumping regime accordingly. This feature helps to maintain vacuum and therefore improves the pumps ability to pump heavy sludges.

Pressure & suction pressure displays for one of the three ram pumps

The EMS system has three modes of selectable pumping operation available.

· Simplex mode - single pump operation.

· Duplex mode – two pumps operating in anti-phase. This produces a laminar pumping flow

· Purge mode – two pumps operating at the same time to provide scouring velocities in the sludge pipe work.

Other job references

Grit pump for Scottish Water

Desludging primary tanks at Leeds


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