Wilo provided a solution to poor heating system circulating water quality for the London-based social housing provider, Poplar Housing and Regeneration Community Association (HARCA).
HARCA manages approximately 10,000 homes in East London and required a system for Carrdale House, one of its buildings in Poplar. The property has four NXR 3 280kW boilers, and the system's main issues were mechanical seal failures on pumps due to poor system water quality as well as poorly made up joints during the installation. Leaks were also causing the system to constantly introduce new clean water to the system, which was diluting the inhibitor, reducing its effectiveness and helping to cause unacceptable levels of debris forming in the system.
After initially running an extended trial of its new particle separator, the Wilo-SiClean Comfort, Wilo installed the new system at Carrdale House in the basement plant room. Designed to provide particle separation for larger heating systems, the Wilo-SiClean is a 'plug and play' system and is simple to install and maintain. The circulating water is set into centrifugal motion so the particles of debris, both magnetic and non-magnetic, can rotate downwards and collect in the desludging tank. The cyclone created in the separator combined with the vortex effect, leads to venting of the fluid and supports the degassing process. Magnetic particles are removed by magnetophoresis.
During the initial trial period, the new system showed a large improvement in the circulating water quality, with a 12% reduction in conductivity, a reduction in iron levels of 75% and evidence of the removal of the black magnetite sludge where the system drained.
Dave Barnett from Poplar HARCA said, "We ran system health check reports on the system before we installed the Wilo equipment, during the trial and at the end of the trial and the results were very good. The Si-Clean Comfort was removing the debris from the system and improving the quality of the circulating water significantly for the building, so I would have to say I was impressed."