Aquatherm Australia issues cautionary note on Combined Copper with PP-R heated water circulatory systems

Thursday March 31 2016

The Victorian Building Authority (VBA) is encouraging all plumbing practitioners to review a cautionary note on mixed (Polypropylene – Random (PP-R/Copper) hot water recirculation systems published by Aquatherm Australia.

Aquatherm Australia is a producer of PP-R pipe systems. Aquatherm has found that PP-R, like any other polyolefin, can fail in the main ring of a mixed (PP-R/Copper) hot water recirculation system due to "Oxidative Stress Cracking".

The cautionary note recommends, in a mixed PP-R/Copper hot water recirculation pipe system, to bring the hot water velocity in the copper pipe system down to 0.7 m/s (absolute max. 0.9 m/s) to avoid excessive copper (erosion-) corrosion.

Practitioners are encouraged to review the cautionary note prior to carrying out work on a mixed (PP-R/Copper) hot water recirculation system.

For a full list of recommendations for hot water recirculation applications, please refer to the cautionary note available on the Aquatherm Australia website.

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