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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


Spare Parts available for retrofitting to Willet Pump



Chevron Seal

Valve Box and Valve Ball, Valve Seat


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Room 1019, Nan Fung Comm. Ctr., 264-298 Castle Peak Road, Tsuen Wan, N.T. Hong Kong


Tel 电話: (852) 2611-7376   Fax 傳真 : (852) 2617-5716   E-Mail电郵 : envirohk@netvigator.com