Veolia Water Solutions and Technologies South Africa has been contracted to upgrade Mangaung Metro Municipality's Maselspoort low and high lift pump station, which currently supplies 34% of Bloemfontein's total treated water. The 12-month contract, which began in September 2013, comprises mechanical and electrical upgrades.
The upgrades entail replacing four low-lift vertical turbine pumps with two low-lift centrifugal self-priming pumps, the motor sets and associated pipe work; and five horizontal centrifugal pumps with two high-lift split casing centrifugal pumps.
The newer low-lift pumps - though numbering just two - easily match the output of the four dated pumps. The duty pump will be operated via a soft starter and the other by variable speed drive (VSD), allowing the operator to regulate pump speed while monitoring delivery flow. The low-lift pump sump will be changed from a dry to a wet well sump requiring additional suction pipework. The discharge pipework will tie into the existing pipework manifolds.
The high-lift split casing centrifugal pumps, which join an existing refurbished pump, will run on VSDs to regulate them according to demand. The pumps and motor operation will be installed with features that enhance operability, maintenance efficiency and overall system reliability, while pump and motor operations can be remotely monitored. The high-lift pump suction pipework remains primarily the same; with only an extension to the weir required and suction pipe for one of the pumps replaced.
The upgrade, due for completion in August this year, includes soft starter and variable speed drive installation, power supply and switchgear modernisation, as well as replacing appurtenant valves.
Veolia Water Solutions and Technologies South Africa has been retained for a five-year period for ongoing training and advising the Municipalities Plant Operations and Maintenance team, in order to actively assist in ensuring that the Mean Time Before Failure and Mean Time To Repair goals of the project are achieved.