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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Ensuring that they perform as they should can be helped significantly fludhing following the correct pre-commission cleaning and flushing procedures of the pipework systems at the pre-handover stage. The very first thing which has to be checked is that the water supply that will be used for the cleaning and flushing process is adequate.
The supply will also need clushing double-check non-return valve fitted. As well as making sure that there is enough water for the flush to be completed, water quality should also be checked at this stage.
We recommend that you take a sample of the water before starting the flushing process pre-flush. If there are any concerns about the levels of bacteria or any other forms of contamination in the water then this can be dealt flshing by pre-treating the water with a suitable biocide as it flows into the system.
BG 29 Pre commission cleaning of pipework systems | Stefano Consonni –
These actions should make sure that the levels of bacteria are low, and that the water quality is suitable for the flushing process. This water will be contaminated with water treatment chemicals and this needs be taken in to account.
Additionally, do you know the exact locations of water supply and drains that are on site? Your engineering contractor or water treatment company will need this information before starting the on-line flushing process. It is always good practice to test the integrity of the water system before you start. You can do this by pressure testing and filling the system to expel all air before the flushing process begins.
Water System Cleaning
Have bypasses fitted close to the valves where required, and make sure all units are on bypass before you start flushing.
This makes sure that no debris which is flushed from the system gets into any units.
You should also make sure you leave all main valves in the fully open position. You should refer to the British Standard BS These documents set out what a contractor should do both before the flushing starts, and during the process.
For example, contractors carrying out flushing should agree what sort of water testing and sampling should be carried out after the flush is completed. These documents offer detailed guidance as to what sort of water samples should be taken, and how many.
Any issues with power supply can delay the flushing process, so look at portable and back-up generators and other solutions in case of power failure. If you are using chemicals as part of the cleaning process, use the same results and dosage calculations to determine the system volume and optimal rates for the final inhibitor and biocide chemicals that will be added to the system once the cleaning and flushing is complete.
Set out and agree a realistic programme of works for the pre-commission cleaning for both the client and the contractor carrying out the work. This schedule should cover things such as drainage, the water supply, required contact times for specific chemicals, and what type of chemical cleaners, inhibitors or biocides will be used.
Most good chemical cleaning and flushing programmes will include several of the following processes:. If as part of the flushing and cleaning you are extending or upgrading an existing pipework system, then you should always take water samples from the existing system and these should be tested.
Pre-Commission Cleaning of Pipework Systems
This will tell you whether you need to do anything to correct issues with the existing system, before adding anything extra. The key pieces of information to record are flushing velocity and water sampling results, and this is often where many pre-commissioning companies fall down. Additionally you should always make sure the people involved in the system flushing are experienced and competent to do their job.
Most good chemical cleaning and flushing programmes will include several of the following processes: Specialist pre-commission cleaning solutions Contact Water Treatment Services today to discuss your pre-commission cleaning requirements. All About Steam Boilers. All About Wastewater Treatment.