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 Bristol Power Flushing Company

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  Power Flush Frequently Asked Questions 

 

  

Question: What is a Power Flush?

Answer: Power flushing is cleaning everything the water travels through in your heating system ie. radiators, pipe work, boiler and hot water coil.

The procedure should only be carried out by an experienced engineer using a high velocity pump to circulate powerful chemicals around your heating system until all the magnetic sludge, debris and scale has been removed (see Gallery). The Kamco ClearFlow pump will then circulate fresh mains water around your heating circuit until a safe pH level has been achieved (pH 7). An inhibitor is then added to protect the system from corrosion and scale build up re-occurring.

 

 

Question: Is Power Flushing a messy job?

Answer: No. The procedure is carried out in a controlled area ie. bathroom, utility or kitchen. A Kamco ClearFlow power flushing pump is connected to your circulating pump (if you have an open vented system) which is usually in your airing cupboard with your hot water cylinder, or connected directly to your combi boiler (if you have a sealed system). If neither is possible, then a radiator is removed and a connection is made to the tails (with the exception of micro-bore). This is usually carried out in the bathroom.

There is no need for the lifting of carpet or flooring, and there is no disruption to any other services. All magnetic sludge is collected on a Kamco CombiMag (powerful magnetic filter), and dumped down a drain gully (see Gallery).

 

 

Question: What is micro-bore?

Answer: Micro-bore is a small pipe system, with a external diameter of 8 to 10 millimetres. Distribution of water to your radiators is done via a manifold (in most cases beneath the floor). Flow and return pipes from the heat source to the manifold are usually 22 millimetres in diameter.

 

 

Question: Can micro-bore systems be power flushed successfully?

Answer: Yes, but the connection of the Kamco ClearFlow pump should be made onto the circulator pump fittings and not to a radiator, otherwise the small bore tubing will drastically reduce the flow rate, and the system power flush will be less successful than normal. Bristol Power Flush double-dose on chemicals (ie using 5 litres of FX2 instead of the usual 2 1/2 litres, or 2 litres of Kamco HyperFlush rather than the usual 1 litre) to ensure the particles of debris are dispersed in as finer form as possible.

If we can't clear a radiator on a micro-bore system due to a plug of sludge that is blocking the narrow diameter pipe work, a Kamco SystemSure injector is used to pressurise the section of pipe work until the plug has been removed.

In general, power flushing a micro-bore system is a more complicated procedure than a standard power flush, and must only be carried out by an experienced engineer using specialised equipment and chemicals.

 

 

Question: Can power flushing cause leaks?

Answer: It is rare for a heating system to experience leaks after the power flushing process. However, experienced heating engineers will probably explain the following to householders. Sludge and debris are present as a result of corrosion over a long period of time.

The power flushing process will cure most circulation problems, but cannot undo the corrosion and gradual decay of heating system components that has led to the need to power flush the system. Occasionally some systems may have radiators with localised deep corrosion pits, with only a scab of rust protecting them from leaking. The vigorous flow rate required to mobilise sludge and deposits may dislodge such a scab, leading to a leak from the radiator during the flushing process.

The advanced stage of corrosion required for such a situation means that the leak will occur imminently, even without a power flush. If it should be brought forward slightly by the flushing process, then it is better that it occurs when a heating engineer is present to remedy the problem, rather than for it to arise over a weekend, or whilst the house is unoccupied.

Kamco flushing chemicals are comprehensively inhibited, so that they do not affect the metals from which heating systems are constructed. They are formulated so they loosen and dissolve the corrosion by-products that cause boiler noise and circulation problems.

 

 

Question: How long does it take to power flush a heating system?

Answer: It will vary from house to house, but generally about 4 to 5 hours for a 3 bedroom house with a vented system, but less time for a sealed combi system as you have less remedial work capping off the cold feed and vent pipe, and removing the feed tank for cleaning. However it will take considerably longer for a vented system with micro-bore pipe work.

  



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Bristol Power Flushing Company working in association with Power Flush Specialist, City Heating Services ltd and pH7Flush Ltd
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