Case study
Selwood provides green
solution to overpumping job
A
n environmentally-friendly and
highly-efficient solids handling
pump provided the ideal
solution when Selwood was contacted
by Bridges Electrical for assistance with
a complex operation.
Wessex Water contracted Bridges
Electrical to carry out upgrades at
Westover pumping station, near
Langport, in Somerset.
The upgrade work included replacing
pumps, fitting new stools, replacing
control valves and concrete repairs to
the base of the wet well at the pumping
station, which is strategically important
and is in an environmentally-sensitive
location on the edge of the River
Parrett.
The challenges were several-fold.
Temporary overpumping was required
to deal with all incoming flows from the
surrounding area and deliver through a
500m existing underground rising main
through to Langport sewage treatment
works.
Overpumping challenge
Overpumping had to be capable of
providing up to 70 litres/sec at 27m
total generated head – a challenging
task indeed.
Further issues to overcome were lack
of space available within the perimeter
of a very small pumping station. There
was not enough space to place a
traditional end suction diesel pump
and access to the manhole was so small
that a traditional electric submersible
pump was out of the question.
Given the station's sensitive location,
a pumping solution using electric
rather than diesel drive was highly
desirable.
When overpumping was required during an upgrade of a
Wessex Water pumping station in Somerset, the rental of an
electric-powered solids handling pump proved the solution
6 WWT PUMP SUPPLEMENT DECEMBER 2017
