"Power flushing" "Powerflushing" "Jet flushing" "Hard flushing"
These are all expressions used in the heating trade over many years to denote the process by which heating systems are forcibly cleansed using water at high velocity, but low pressure, so that no physical damage is caused to the system. The process is made even more effective with the addition of powerful cleansing and mobilising agents.
The objective is to restore systems with circulation and boiler noise problems (caused by sludge and corrosion deposits) to optimum operation. Power flushing removes these deposits and the problems that they cause.
Power flushing is also an excellent way to pre-commission clean new heating systems, to remove excess flux, swarf and other debris, and the grease and oil used to prevent the rusting of components before use.
It is essential when fitting a new boiler to an existing heating system to powerflush to prevent future problems. Many systems are found to contain corrosion and sludge, even if no flow problems have yet shown themselves.
Existing debris is often mobilised by alterations to the system/piping and the increased efficiency of the new boiler, and may then accumulate in the boiler heat exchanger, causing noisy operation, reduced efficiency and, in extreme circumstances, failure of the boiler (usually resulting in the manufacturer's warranty being invalidated). The high efficiency and compactness of modern boilers, developed to minimize fuel costs and pollution, means that they are more susceptible to problems caused by debris in the system water.
HOW DOES IT WORK?
The power flushing pump is connected into the heating system, either across the circulator pump couplings or across the tails of one radiator. The powerful flow, combined with instantaneous flow reverser device, will dislodge and mobilise deposits and corrosion which resist traditional system cleaning methods.
A Magnaclean power flushing filter is also used to remove circulating black iron oxide contamination from the flushing water quickly and simply. Using the power of rare earth magnets it attracts magnetic iron oxides away from the water flow.
The cyclone construction directs contaminated water through a high power magnetic field, such that even the smallest of particles are retained on the central magnets, from which they may be easily cleaned during and after the power flushing process. Larger particles, which may otherwise lead to blockages in small bore pipework, are also prevented from re-entering the heating system.
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 most cases it will cure the problems caused by these.