Screw centrifugal pumps resist blockages
A
Hidrostal product story
Edited by the Engineeringtalk editorial team
Jan 9, 2004
A number of operators have realised the benefits of switching to Hidrostal pumps.
By the nature of the liquid processed there is an inherent risk that pumps will suffer blockages caused by foreign materials in unscreened raw sewage, including solid objects (such as bricks/wood) and rags and fibrous materials (such as hosiery products).
As materials accumulate in the pump: output and efficiency reduce; running hours increase; more energy is consumed; seals and bearings wear prematurely; vibration becomes excessive; and operating costs increase.
Blocked pumps also require unscheduled site visits, additional costs outside the scope of the simplistic "purchase price/energy/scheduled maintenance" model of the typical life cycle costing model (LCC).
Historically, sewage operators specified pumps with impeller free ball passages of 100mm plus.
However, with sewage pumps the impeller blade geometry and free passage are equally important.
Field experience demonstrates that conventional pumps with 100mm passage (or more) often block with material collecting at the impeller inlet.
The Hidrostal response is its unique screw centrifugal impeller technology.
The free passage increases with pump size and the impeller inlet geometry prevents accumulation of fibrous materials.
The Hidrostal screw centrifugal impeller, with its axial extension can solve blocking problems while avoiding compromise of hydraulic design.
A number of operators have realised the benefits of switching to Hidrostal pumps.
In 1998 Hidrostal supplied close-coupled bearing frame pumps to Blackburn WWTW, North West Water to replace progressive cavity pumps that "burnt-out" continuously.
Achieving a six-month payback, the Hidrostal pump has suffered only one failure in five years, due to operating at 60m head for long periods.
At Millhead Pumping Station, Cumbria, Hidrostal equipment installed in March 2003 to replace continually blocking pumps.
Maintenance costs have reduced considerably; energy consumption is much lower.
In January 2003, Hidrostal screw centrifugal pumps were installed at Madamswood SPS, United Utilities, to replace consistently blocking pumps.
To date, the Hidrostal equipment has been blockage-free.
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