Hidrostal Supplies High-Efficiency Wastewater Pumps to U.A.E.
Hidrostal’s non-clog screw centrifugal impeller pumps have been used in conjunction with Iseki’s vacuum sewage collection system to provide a high-efficiency wastewater pumping package to the University City in Sharjah, United Arab Emirates.
In 1997, The Sheikh of Sharjah, His Highness Dr. Sheikh Sultan Bin Mohammed Al Qassimi took personal responsibility for building a University in the Emirates. Some 20 weeks before the opening, Iseki Vacuum Systems, specialists in providing efficient sewage collection systems in locations impossible or impracticable for gravity systems to operate, were asked to provide a solution.
The Iseki Engineers designed the scheme on site ahead of construction. Local companies in Sharjah were used to manufacture and supply the HDPE pipes. The vacuum vessels were also fabricated locally; the rest of the equipment including the Hidrostal dry well submersible pumps were purchased and brought from Europe.
The Hidrostal pumps were selected because the screw centrifugal impeller has a low NPSH (net positive suction head) and good solids handling capability.
As Brian Hayden of Iseki Vacuum Systems explains: ‘This was the first time that we had used Hidrostal pumps. ...they [the pumps] were chosen because they have a low NPSH. This means that the pumps have considerable suction capability and sewage can be pulled out of the tank even though it is under vacuum without the need to fit balancing lines which the pumps we used previously required and as a result they were prone to blocking. ... This feature, coupled with the solids handling capability has ensured that the Hidrostal pumps run blockage free’
This assertion has recently been supported by Stuart Megson, Head of Drainage
Sharjah Municipality, who observed: ‘... these pump units have been working extremely well since 1997 when they were installed and commissioned. They cope extremely well with the transfer of the raw sewage delivered from the main vacuum collection tank and we have not had to touch them since they were installed!’
Hidrostal have supplied a total of eight 150 mm (6”) pumps, each rated at 50 l/sec (full duty), in three separate phases.
The first batch of four were supplied in 1997, a further 2 in 1999 and the last 2 in 2001.
Source: Hidrostal Ltd