a quatherm p resentation AHSCA WA 22 nd October 2014
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Transcript of a quatherm p resentation AHSCA WA 22 nd October 2014
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aquatherm presentation AHSCA WA 22nd October 2014
“AS/NZS 3500.4 Hot water recirculation coverage” “Will it become a reality?”
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Copper ions harvested in PP-R HWRS pipes having a catalytic effect on oxidative stress cracking.
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Misinterpretation of the maximum velocity of 3.0 m/s mentioned in current AS/NZS 3500.4:2003
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Misinterpretation of the maximum velocity of 3.0 m/s mentioned in current AS/NZS 3500.4:2003
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AS/NZS 3500.4:2003 section 9
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AS/NZS 3500.4:2003 section 9
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Recommendations by Prof. G.George Emeritus Professor of Polymer Science QUT Brisbane, AM
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Recommendations by Prof. G.George Emeritus Professor of Polymer Science QUT Brisbane, AM
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Recommendations by Prof. G.George Emeritus Professor of Polymer Science QUT Brisbane, AM
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Recommendations by Dr. Jeff D. Gates BSc, PhD, MIEAust, CPEng, CMP UQMP
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• Produced review of current knowledge in 2003 on copper corrosion in plumbing
• Specifically recommended maximum flow velocities of 2m/s in cold water and 0.5 m/s in hot water systems.
• Paper peer reviewed and approved by Dr Nuttall for re-issue in 2010 while supported by European Copper Institute. Clearly, they believe a velocity constraint is required even if it is absent from BS EN 806-5!
• Both German Standard (DIN1988) and Dutch KIWA recommend velocities below 0.5 and 0.75 m/s respectively.
Recommendations by Dr. David Nicholas Nicholas Corrosion Pty Ltd
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• It is clear that as temperatures rise above ambient allowable velocities reduce. Precise quantitative figures are not available.
• Dr Gates considers temperature a critical component of corrosion-erosion
• Nevertheless, most authorities and references (including CDA) show that above 60oC velocities by consensus should be reduced to 0.9 m/s maximum.
• This applies to recirculating HWS where velocity is constant. • Some references suggest even lower velocities are advisable
(0.7 m/s)
Recommendations by Dr. David Nicholas Nicholas Corrosion Pty Ltd
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• Copper, although it generally has excellent corrosion resistance, is still a relatively soft metal.
• Protective oxide films on copper change composition at around 60oC (CU2O CuO)
• There is limited research on effects constant temperature and velocity as found in recirculating systems.
Recommendations by Dr. David Nicholas Nicholas Corrosion Pty Ltd
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Recommendations by Dr. David Nicholas Nicholas Corrosion Pty Ltd
• In continuous recirculating hot water systems with temperatures > 60oC it is prudent to keep constant velocities below 0.7 m/s and certainly below 0.9 m/s, regardless of limits in AS/NZS 3500
• It is known and published that velocities should not exceed 0.5-0.9m/s in recirculating hot water systems
• Dr Gates investigated failures where velocity was ~1.5m/s, well below allowable 3m/s
There needs to be independent study of allowable maximum constant velocities with a view to reducing the present limits in
AS/NZS 3500.4.
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Recommendations by Dr. David Nicholas Nicholas Corrosion Pty Ltd
• Hydraulic design of copper recirculating systems should limit velocities to less than 0.9m/s maximum, with 0.7m/s being preferable.
• Excessive temperature should be avoided wherever possible.
• It is prudent not to mix copper and polypropylene pipe in the same recirculating system where temperatures exceed 60oC and water velocities exceed best practice.
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Recommendations by Foundation of Water Research UK 2003/2010
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Recommendations by CDA USA 1996
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CDA US Copper Symposium 2001
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CDA US Copper Symposium 2001
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The Copper Tube Handbook CDA US 2011
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Velocity proposal – Feedback from PCC October 2013
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DRAFT for Public Comment AS/NZS 3500.4:2014
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Shafton University Mansions QLD Tribunal
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Shafton University Mansions QLD Tribunal
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Shafton University Mansions QLD Tribunal
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Shafton University Mansions QLD Tribunal
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Shafton University Mansions QLD Tribunal
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Hopefully in the near future this will be something from the past