Case Study: REFURBISHENT,AND PROTECTION OF RAW WATER PUMP

1: Pump on arrival. 2: Impeller during the coating process. 3: Completed pump casing reassembled after coating, before impeller re-fitted.
A18 159

250/400 Centrifugal Pump

A raw water pump in service at a combined cycle
gas turbine (CCGT) power station required a
programme of refurbishment and corrosion
protection, in order to prolong its service life.

The pump was stripped down and both the casing
and impeller were abrasive blasted to therequired
cleanliness standards, before the casing was premachined to accommodate the coating process.

Plasmet HTE was then applied to all internals,
2mm on the casing and 1.5mm of the impeller.
These items were thickness and spark tested to
27Kv and 17KV respectively to check for holidays.

Plasmet HTE is ideal for areas requiring abrasion
(and chemical) resistance. This material has been
used in cyclones, chemical process vessels, sugar
beet pulping drums etc. It is also useful for
building up damaged areas of pump impellers and
casings where impact or abrasion, are prevalent.

During the refurbishment process bearing and
gasket seals were replaced and the impeller was
dynamically balanced before the pump was
reassembled for dispatch and re-installation fully
protected against corrosive seawater.

Industry CCGT power station
Environment Raw water
Plant Coated Centrifugal pump
Preparation  Sa2½, 50μm
Coating Plasmet HTE, Plasmet ZF
Application Brush
DFT Casing: 2mm, Impeller: 1.25mm
QA Thickness & spark testing