PFM 20 9 - Page 5

Full Flow Benefits for Industrial
Heating System Filters
ontrolling contamination in
larger buildings is vital to
maximise heating efficiency
components. One of the best ways to
protect against contamination is to fit
an industrial boiler filter. But the last
few years have seen an influx of many
different types of heating system
filter, each with different price points
and performance.
The fit and forget nature of filters makes
it very important to get the right filter unit.
You may think the problem has been
addressed simply by fitting a filter, but
the consequences of fitting a poor
performing filter can be serious. One of
the major features to look for when
selecting a good quality heating system
filter for industrial applications is full flow
filtration. Craig Worth, National Sales
Manager at BoilerMag explains why it’s
so important to choose a full flow filter
rather than a side stream filter.
A magnetic filter is a vital means of
controlling magnetite, or black sludge,
in heating systems. In order to prevent
problems caused by black sludge, it is
imperative that magnetite is extracted
immediately from the circulation, before
it reaches the boiler. To do this
effectively, it is important to choose a full
flow filter that filters 100% of the water
on a single pass, rather than a side
stream filter.
of magnetite is captured on the first pass Side Stream Filtration Vs Full Flow
through the filter is absolutely essential. Filtration
Although side stream filters may be a
tempting option due to the attractive
Practical Benefits for Installers
Choosing a full flow heating system filter price tag, water has to pass through the
has several practical benefits for the filter a number of times and collect the
installer and service engineer. Full flow magnetite gradually. Obviously this
filters can be connected within the main leads to the circulation of contamination
circulation of the heating system, making within the system, putting the boiler,
them relatively straightforward to install. valves, and radiators at risk. A
However, side stream filtration requires contaminated system, therefore, leads
the creation of an additional flow and to an inefficient system, with a boiler that
return, which can mean more time, is prone to failure.
Full flow filters, on the other hand,
expense, and additional space.
ensure that 100% of water is filtered and
the maximum amount of magnetite is
Optimum Operating Temperatures
A good full flow filter will operate at removed on first pass through the filter,
temperatures up to 150°C, but a typical returning only clean water to the boiler
side stream filter may have a maximum and radiators. This, in addition to the
temperature of just 100 °C. With some effective venting of trapped air, ensures
commercial and industrial heating a clean, energy efficient heating system.
systems running at temperatures above For
Fighting Black Sludge with First Pass 100°C, ensuring that your chosen filter
will comfortably accommodate higher
First pass efficiency is a key judging temperatures is key.
Reader Reply: 209011
criteria when it comes to selecting a
heating system filter. The more
contamination that is taken out on first
pass, the less that is flowing through the
boiler heat exchanger; therefore making
it less likely to become attached to
valves, radiators, pumps. Whilst no filter
can remove 100% of contamination, it is
important to remove at least 90% on the
first pass. Some filters remove as little
as 20% due to limitations in design.
Side stream filters, for example, collect
the magnetite gradually over several
passes through the system, extracting
only 3 – 10% of the magnetite in a single
pass. This method is ineffective, and
therefore, a risky option. Choosing a
filter that ensures the maximum amount


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