Pre-commission Cleaning of Pipework Systems (2nd edition)

The subject of pre-commission cleaning of pipework systems, to remove these contaminants, was first addressed in the 1991 BSRIA Application Guide AG8/91: Pre-Commissioning Cleaning of Water Systems. Many of the recommendations in this guide considered unconventional at the time. However, in the intervening years, experience has shown that systems which are designed and cleaned following this guidance are far less likely to suffer operating problems.

System contaminants such as mill scale, jointing compound, and building debris will inevitably be found in newly-fabricated heating and cooling pipework systems. If allowed to remain in the system in sufficient quality, these contaminants will make the system prone to blockage at strainers, control valves and small bore heat exchangers. They may also initiate further corrosion and encourage the growth of micro-organisms.

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Pre-commission Cleaning of Pipework Systems (2nd edition)

• DESIGN CONSIDERATIONS
• INSTALLATION CONSIDERATIONS
• SYSTEM DYNAMIC FLUSHING
• CHEMICAL CLEANING PROCEDURE
• CONNECTIONS BETWEEN NEW AND EXISTING SYSTEMS
• A – Calculation of mean flushing velocities
• B – Procedure for pre-commission cleaning with inhibited acid
• C – Polymer cleaning (with side stream filtration/separation)
• D – Procedure for pre-commission cleaning with formulated products.
• E – Example certificate of conformity for system cleanliness.

The designer should address the requirements for system cleaning at an early stage in the design of the system. The designer should aim to assess:

• Which methods of cleaning are most appropriate for the system
• Whether chemical cleaning is important to the successful operation of the system
• What design features need to be incorporated to facilitate the cleaning process.

In consideration of these aspects, the designer should advise if a cleaning specialist  required and one should be appointed. In most cases, the designer will benefit from the involvement of a cleaning specialist at the design stage of the project. The appointed cleaning specialist should be a suitably qualified person with a proven track record in system flushing and chemical cleaning.

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Pre-commission Cleaning of Pipework Systems (2nd edition)

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