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DOSAFIL-DUO CLEANS UP POLICE AUTHORITY
HVAC SYSTEM A police authority headquarters in the Midlands has had its closed, low temperature hot water system saved from potential failure thanks to DosaFil-Duo. DosaFil-Duo is a unique conditioning device that combines solid or liquid chemical treatment dosing with constant side stream fi ltration and continuous air removal.
This technology is providing an economical and convenient alternative to powerfl ushing by cleaning and protecting the system online. DosaFil-Duo was installed after Anker Elemental, a water treatment specialist contracted on the site, discovered there were harmful levels of contaminants within the system’s circulating water.
Despite being installed recently, the hot water system, which controls ambient temperature in the building, contained extremely poor-quality water. Ian Looms, Managing Director at Anker Elemental, explained: “The water’s pH was wrong, it was full of suspended metal solids and so on. In- depth testing revealed that the system had not been cleaned correctly, or possibly at all, while the inhibitor concentration was insuffi cient.
“It was also apparent that water treatment had not been maintained in the lengthy period between completion and handover. These conditions are likely to lead to serious problems such as accelerated corrosion, blocking of the system’s control valves, and even complete system failure.”
In the absence of correct system cleaning and fl ushing, contaminants, such as fl ux residues, installation debris, and greases and oils from manufacturer components, will remain in system water. Such impurities not only cause corrosion but prevent subsequently dosed inhibitor from working effectively. Furthermore, water treatment, even when applied correctly, must be maintained to ensure lasting protection.
The fi rst step in Anker Elemental’s remediation programme was to
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clean the system. Traditionally, the company may have chosen powerfl ushing for this purpose, however, DosaFil-Duo presented a better solution.
Looms said: “In this case, powerfl ushing would have necessitated the opening of every valve on the system, all of which are behind wall panels. This would have been an extremely expensive endeavor and incredibly disruptive, potentially requiring large parts of the building to be shut down.
“DosaFil-Duo, on the other hand, enables commercial and industrial systems that are fouled with corrosion, limescale and harmful deposits to be cleaned up online (fi ltration is possible to 0.5 microns). By installing DosaFil-Duo, we eliminated the need for costly and inconvenient offl ine cleaning, and made it possible to optimise the energy effi ciency, performance and longevity of the system, as well as minimise unplanned maintenance and system downtime. DosaFil-Duo was the obvious choice.”
Once installed on the system – a process which took less than a day - the DosaFil-Duo was dosed with BSK100, a solid online cleaning chemical product from SolidTek Limited.
The remainder of Anker Elemental’s remediation programme includes bi-monthly visits to the site, where water quality samples are taken for analysis and the fi lter bags inside DosaFil-Duo are changed (a process which takes less than fi ve minutes).
DosaFil-Duo is the only water conditioning device on the market with smart monitoring technology out of the box that automatically notifi es users when fi lter bags require changing (with communication options for BMS built-in as standard).
Work started over the summer period, when large parts of the system were offl ine. For the parts of the system that were online, DosaFil- Duo delivered excellent results: “We worked down from a 50-micron fi lter to a 10-micron fi lter, which shows just how much suspended solids the
DosaFil-Duo picked up,” explained Looms. “We’ve only had to switch back up to a 25-micron fi lter since the offl ine sections of the system were placed online, as this mixed dirty water back in to the cleaner water. However, we’re confi dent that the system will be clean soon given DosaFil-Duo’s effi cient performance.”
Results from the water quality samples have also been positive. “We test each sample for variables such as iron content, turbidity, conductivity and so on, and have seen vast improvements in water quality. In addition, we have documented progress for the client, who is pleased to receive visual and data evidence of the cleaning and protection programme.”
Anker Elemental has also since introduced a liquid chemical corrosion inhibitor into the system via the DosaFil-Duo device.
The police authority has been so impressed with DosaFil- Duo that a second device has now been installed in another building, this time on an existing medium pressure hot water system. Furthermore, the principal mechanical contractor recommended DosaFil-Duo to the council, where two further devices have since been installed.
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