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FEATURE


Chris explained: “We reviewed documentation for the system but there was nothing to indicate any kind of pre- commission cleaning or inhibitor treatment. It’s reasonable to assume, especially given the state of the system, that it had not been treated at all. This particular system has a real mix of metals, so the potential for corrosion in the absence of proper water treatment is great.”


The solution arrived in the form of best practice water treatment using Sentinel Commercial’s boiler-manufacturer endorsed chemicals. Best practice water treatment comprises: cleaning to remove debris and restore system efficiency; adding inhibitor to prevent further corrosion and limescale; and regular maintenance of system water.


Sentinel 8500 Cleaner was used as part of a two-stage cleaning process. Firstly, 3% of system volume cleaner was introduced to the system where it was left for 24 hours. During this time, all of the system’s flexible hoses were disconnected so that resident debris could be pushed out using a metal rod. The system was then flushed before a further 3% of system volume cleaner was added and left for another 24 hours – again followed by flushing.


The conductivity of the system water was measured to ensure it was within 10% of mains water conductivity, before Sentinel X100 Inhibitor was added. In fact, an increased level of X100 Inhibitor was introduced because this advanced product continues to clean a system by taking iron oxide into solution. As a result, X100 Inhibitor’s long-term corrosion control properties are excellent.


www.tomorrowsfm.com


Within two weeks of system cleaning and inhibitor introduction, tenants said that the heat was coming through. A week later people were complaining that it was too hot, principally because many of the building’s thermostatic valves had previously been set at maximum to try and combat the dysfunctional system. Sentinel Commercial and Richard Cumber duly recommissioned the heating system’s control to better regulate the heat. The building could then be heated properly and, two years on, the system is still working great.


Liz concluded: “The biggest difference has obviously been our maintenance costs. We were continuously calling our previous heating contractor, whereas now the system looks after itself with the occasional monitoring check. I’ve seen for myself some of the samples that have been collected since the system has been cleaned and treated, and the difference in corrosion content is astonishing compared with previous levels, so we know the inhibitor is doing a terrific job. We have also noticed that our energy bills are slightly less than before. This saving, together with the large reduction in maintenance costs, means the project will pay for itself.”


After completing the works, it was agreed that both Sentinel Commercial and Richard Cumber would monitor the iron levels in the heating system due to its previously perilous state.


www.sentinelprotects.com/uk TOMORROW’S FM | 31


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