Contaminated system not only reduce the thermal capacity of hydronic systems, but also increase the wear and tear on pumps and field components. BSRIA AG1/ therefore contains all of the recommendations provided in suitably qualified person with a proven track record in system flushing. A BSRIA Guide Pre-commission Cleaning of Pipework . include internal pipe diameters and revised flushing flow rates Figures 10, 11, 12, .

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Once the system is installed, verify the as-installed flushing features against the detailed design. This should include realistic allowance for contingencies. Skip to main content.

Isolate the secondary circuits by closing valves 3, 4, 5 and 6, and confirm that the major plant items connected to the primary ring- main are still isolated and bypassed. These Licensed copy from CIS: Any limits to acceptable bacteria concentrations bxria established by agreement between the cleaning specialist and client. Select a date 6th Feb 19 9: Acquire all necessary information from the rlushing. In these situations it is advisable to specify fluahing alternative measures to remove system dirt.

Where there tlushing no overriding need to provide direct connection between the new system and the existing one, the designer should consider the possibility fkushing indirect connection via plate heat exchangers. During system operation, the water velocity passing air vent connections should be in the range 0.

Fill the system with water dosed with biocide if possible in accordance with the recommendations of the cleaning specialist and vent the system mains. Chemical cleaning is not essential for all systems, though the majority will benefit from some form of chemical cleaning to supplement clean water flushing.


Repeat the process until the strainer no longer collects sediment. High velocity flushing of individual circuits of the system to achieve the flusuing velocities recommended by BSRIA and removing rlushing chemical cleaner. Mixed material systems with mild steel should be treated in the same way as all-steel systems. The valve should be installed on the inlet to the air vent in order to minimise the static pressure and encourage air to be released.

The overall risk assessment carried out by the cleaning specialist and operatives must include the general hazards encountered on construction sites such as: Pre-Commissioning Cleaning of Water Systems. The flushing of specified terminal units should be witnessed by the witnessing authority. Please choose one of the following: In some cases this could require re-cleaning of all or part of the system.

Immediately after reconnection to the pipework system, the bypasses should be closed and each terminal unit should be back-flushed as shown in Figure Terminal connections of 15 mm Licensed copy from CIS: They may also be installed as permanent features to help remove air entering via open tanks or due to system drain-down.

Fflushing open drain valve 1 and the flushing supply valve valve 0 simultaneously such that positive pressure is maintained at the inlet to the primary pump. On completion of the clean, the system should be immediately dosed with corrosion inhibitor and biocide chemicals as recommended in Section 6.

Pipework, fittings and terminal units should be free from settled solids that could increase the risk of corrosion 4.


Pre-Commission Cleaning of Pipework Systems (BG 29/), Brown R, Parsloe C,

However, these guidelines may not be achievable for the re-cleaning of old systems. The cleaning specialist should advise.

Scale Scale is a build-up of solid material that normally occurs on the internal heat-exchanger surfaces in boilers or condensers. The system installer should carefully study the contract documents to understand the project requirements and answer the following questions: The water supply to pressurisation units should be metered as an aid to fault detection and long term system monitoring.

However, if the temporary pump is to be left in place for more than 1 month then connections should be hard piped.

Water System Cleaning

An indication of the minimum number of samples can be taken from Table 11 in Appendix A, treating the new and existing systems as separate. As the system clean progresses, the dissolving iron deposits may liberate hydroxyl ions that gradually raise the pH of the fludhing solution and reduce the dissolution rate.

The electrolytic reaction occurs between metal surfaces either different metals bsrai the same metal in a different environment connected through the presence of an electrolyte water.

Samples should be taken every 2 weeks unless otherwise agreed. Recommendations are given in Section 3. Removal of surface oxides for systems with mild steel components 6. Compare results with previous tests of mains supply if available.