What is power flushing and why do we do it
Power flushing, in
conjunction with cleaning the system with chemicals, is also an excellent way to
clean the new heating system. This removes excess flux, swarf and other debris, and
the grease and oil used to prevent rusting of components before use.
It is prudent to power
flush a heating system immediately before fitting a new boiler to an existing
system to prevent possible future problems. Many systems are found to contain
corrosion and sludge, even if no flow problems are yet evident.
Existing debris is often
mobilised by alterations to the system/piping and may then accumulate in the boiler's heat exchanger, causing
noisy operation, reduced efficiency and, in extreme circumstances, failure of
the boiler. The high efficiency and compactness of modern boilers, developed to
minimise fuel costs and pollution, means that they are more susceptible to
problems caused by debris in the system.
The power flushing pump is simply connected into
the heating system, either across standard circulator pump couplings, across
the tails of one radiator, or wherever most practicable. The powerful flow,
combined with instantaneous flow reverser device, will dislodge and mobilise
deposits and corrosion which resist traditional system cleaning methods.
Once the corrosion and
sludge deposits have been loosened and mobilised, fresh clean water is forced
through the heating system, pushing the contaminated water out through a full
bore dump valve to waste. During the
process, radiators are individually flushed, without removing or
disconnecting them from the system, by directing the full output of the pump
through each radiator separately.
At the end of the flushing
process, the system contains fresh clean water and reinstatement of the system
to normal operation takes only a few minutes.
System flushing will not
remedy design or mechanical faults, which should be rectified, but in many
cases it will cure the problems caused by these.