Click on the video to see how the CleanflowCPR works
The video below shows a badly contaminated district heating system before Cleanflow CPR valves were installed. The hose you can see was attached to the HIU at one end and the primary flow valves opened to flush the debris into the WC. At the time of this video the scheme was only 2 years old and all units had lost their heat supply. Engineers were being called out every day to clean HIU strainers, only for them to re-block within hours in many cases.
Due to the amount of debris present in the primary network, the landlord arranged for a high pressure manual flush to try and force the debris out of the pipes. This involved flushing the entire primary network, then arranging access into all units to flush the legs between the network and the HIUs. The whole process was expensive and very disruptive. However, despite flushing, it wasn't possible to remove all of the debris and many HIUs continued to block with debris. The landlord decided to install Cleanflow CPRs and engineer calls stopped immediately. Since fitting, there have been no callouts due to blocked strainers and the Cleanflow CPRs continue to clean the primary network every day, moving any debris that finds its way to the HIU back to the plant room filters and maintaining a reliable heat supply to the residents.
Below you can see the Cleanflow CPR assembly retrofitted into an existing scheme. It's position directly above the HIU redirects any debris from the primary flow to the return, bypassing the HIU and protecting the heat exchanger and other sensitive components that are easily damaged by debris, eg actuator valves. This results in maximum flow and a reliable heat supply at all times.