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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However, health and safety requirements must be taken into account when dosing biocides, since there is a possible risk of contact with site personnel should the system leak or fail during pressure testing.

However, in the intervening years, experience has shown that systems that are designed and cleaned following this guidance are far less likely tlushing suffer operating problems. The biofilm a mixture of live and dead bacteria and their excretions helps the bacteria to resist the action of biocides and seeds bacteria back into the system water.

We aim to improve the efficacy and quality of on site water treatment and cleaning processes.

IV IV STR Base building installation Fit-out works for future connection 1 A temporary bypass between flow and return pipe connections prevents them from becoming dead-legs where dirt or bacteria could collect. Your engineering contractor or water treatment company will need this information before starting the bsroa flushing process.

Guide to Flushing and Pre-Commission Cleaning of Pipework

Bypasses should incorporate isolating valves to prevent short circuiting during subsequent normal plant operation. In particular the installer will need to be aware of bsrai conditions that should be maintained during the clean. This will tell you whether you need to do anything to correct issues with the existing system, before adding anything extra.

All terminal units and plant items should have been isolated and bypassed during flushijg pre-flushing and chemical cleaning stages.

The initial fill should include the addition of inhibitors and biocide as recommended by the cleaning specialist to protect the system between pressure testing and pre-commission cleaning. The requirements for the number and location of samples are summarised in Appendix A. These drawings should show the details of temporary facilities required.


Turn on the secondary pump. We also provide detailed Method Statements for any tasks undertaken according to the nature of the work. In general, air vents should be provided on flow and return pipework at the ends of each horizontal run, and at the tops of each self- draining section. Also, the ammonia produced by some of these bacteria when metabolising nitrite can lead to stress corrosion cracking of brass fittings.

To facilitate this operation, spool pieces should be kept as small as possible. Scale is not present in newly installed systems. In general, flushing should start from the top floor and work down the building through intermediate levels to the ground or lowest floor. Plant and equipment isolation and bypassing The system should be designed to enable the isolation and bypassing of all sensitive plant and equipment items such as boilers, chillers, heating and cooling coils, chilled beams, terminal units, control valves, low-flow and regulating valves, during the course of the flushing and cleaning operation.

Where temporary pumps are to be shared between different circuits, care should be taken not to spread bacteria between circuits via the temporary pump.

Water System Cleaning

This guide provides the latest thinking and good practice cleaning techniques. If necessary, turn off the pumps and clean the strainer baskets and dirt pockets. Identifying whether the pipe-work contractor is to carry out water system flushing prior to chemical cleaning Establishing how the flushing velocities are to be achieved i. The water supply to pressurisation units should be metered as an aid to fault detection and long term system monitoring.

This includes keeping materials in clean condition and temporarily capping incomplete pipework and fittings. Spading-off may be possible as a viable alternative to the permanent installation of valves.

These are now recognised flushong distinct species but are still relevant to pipework corrosion. Biological flushing of the system may also be necessary. Identifying whether the pipe-work contractor is to carry out water system flushing prior to chemical cleaning.


Special precautions should be made to ensure that corrosion products that may be loosened by the water system cleaning process do not cause blockages. Neutralisation for inhibited acid cleans only 8. If the system is to be operated flishing this way for a prolonged period, the cleaning specialist should institute a sampling regime to check water quality and undertake dosing as required.

The particular issues associated with connecting new and existing systems are discussed in Section 7.

A reverse return circuit will incorporate large bore pipework on the flow and small bore pipework on the return at the connection point to the first terminal unit and conversely a small bore flow and large bore return at the connection point to the last terminal unit.

It was decided that additional guidance was required to address these particular situations.

Water System Cleaning

With reference to the cleaning stages defined in Sections 5 and 6 of this guide, the following activities listed will be required to demonstrate the success of the system clean. Pressure test points should be provided on both sides of all strainers so that flushingg pressure drop can be monitored.

Pre-Commissioning Cleaning of Water Systems, published in Descriptions for each of the chemical cleaning stages are provided in Section 6. The introduction of water treatment chemicals should rlushing via one of the following methods: The reference on page 82, section 7.

On completion of the clean, the system should be immediately dosed with corrosion inhibitor and biocide chemicals as recommended in Section 6.

Other systems may have more stringent flushihg. We are motivated to build an open and interdependent relationship that will offer the level of trust and collaboration necessary to provide a punctual and compliant delivery, whilst maintaining cost certainty.