PIPEWORK CLEANING


corrosion Keeping


at bay


Cleaning pipework at the pre-commissioning stage in new projects is becoming increasingly important to prevent contamination. Below, Reginald Brown explains the risks and offers a guide to good practice. On page 58 we look at pipework materials


T www.cibsejournal.com


he trend toward variable speed pump and two port control of heating and chilled water systems saves pumping energy. But low flow velocity


also increases the risk of corrosion and


microbiological problems, if water quality is not carefully managed throughout the life of the system, particularly during construction and commissioning. Low and intermittent flow can allow


sedimentation of suspended solids and increases the opportunity for biofilm to colonise the surface of the pipe. Trapped air may not be moved to vent points. The combination of solids, biofilm and oxygen is a recipe for rapid corrosion. And, unless the building management system is programmed to allow periodic circulation


November 2011 CIBSE Journal 53


BEEE/Shutterstock.com


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