As part of the major upgrade works along the river Thames,
CovElec undertook the complete mechanical upgrade to various sites owned
by Affinity Water.
These drinking water extract works incorporated the upgrade to fish screens providing higher
throughput with greater pumping capability into the supply
network.
CovElec initially sized 4off ABB motors from pump
performance curves. The optimum power requirements were noted to
be 273kw @187lts/sec with a peak of 313kw @207lts/sec. The motors selected
were 355kw ABB IE3 energy efficient process performance
providing >10% spare power output.
CovElec's scope of supply widened
out to include the installation and commissioning
of the motors and higher output pumps.
CovElec undertook the design and manufacture of the
pump plinths, frames and mounting supports. The design has to take into account
the hydraulic effects of multiple pumps delivering water into the discharge manifold
on peak demand.
The old motors and pumps were removed and set aside. New
reinforced concrete plinths put in place, newly fabricated pump frames,
greater throughput pumps, new ABB motors, new pipework and
instrumentation installed and commissioned.
CovElec engineers undertook laser alignment in the vertical
axis on the flange faces to ensure the installation
was concentric.
Finally a vibration and 3D space plot were carried out to check
the installation was within the operating window and trim balance undertaken where
necessary.
CovElec are currently back on site after the site owners
requested the pumps be overrun at 55hz to ensure there are no
harmonic or resonance issues.
