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Headline in Helvetica Neue LightConnections to a discharge stack at the same floor
René Offringa
Technical Advisor Wavin Netherlands
Headline in Helvetica Neue Light
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Headline in Helvetica Neue Light
Content
1. Introduction: difficult building situations
2. Test set-up
3. Test results
4. Conclusions
5. Proposal for standards
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Headline in Helvetica Neue LightBack flow from stack into branch
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Headline in Helvetica Neue LightAvoiding back flow
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Headline in Helvetica Neue LightPossible effects of back flow
• Contamination of the branch with possible clogging
• Pressure fluctuations which results in water losses at water traps
• Slow discharge at small devices flushing at the same time
• Contamination of water traps
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Headline in Helvetica Neue Light
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Headline in Helvetica Neue LightTest set up reference test
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Headline in Helvetica Neue Light
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Headline in Helvetica Neue LightPicture of the reference test
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Headline in Helvetica Neue LightTest 1, reference test
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Headline in Helvetica Neue Light
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Headline in Helvetica Neue LightTest set up back flow
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Headline in Helvetica Neue Light
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Headline in Helvetica Neue LightTest 2, double T 180°, H=0, 2 l/s
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Headline in Helvetica Neue Light
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Headline in Helvetica Neue LightTest 3, ball T 180°, H=0, 2 l/s
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Headline in Helvetica Neue LightTest 4, double swept T 180°, H=0, 2 l/s
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Headline in Helvetica Neue LightFlushing situation at different fittings
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Headline in Helvetica Neue LightTest 8, double T 90°, H=0, 2 l/s
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Headline in Helvetica Neue Light
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Headline in Helvetica Neue LightTest 16, 180°, H=150, 2 l/s
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Headline in Helvetica Neue Light
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Headline in Helvetica Neue Light
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Headline in Helvetica Neue LightTest 17, 180°, H=150, 0.3 l/s
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Headline in Helvetica Neue Light
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Headline in Helvetica Neue LightTest 34, 0°, H=300, 2 l/s
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Headline in Helvetica Neue LightTest 38, 180°, H=450, 2 l/s
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Headline in Helvetica Neue LightProposal for standards (1)
• Any branch opposite another branch on which a toilet or other device with a lot
of contamination is connected, should be avoided, meaning all connections 180°
at the same level, straight T, swept T or ball T.
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Headline in Helvetica Neue Light
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Headline in Helvetica Neue LightProposal for standards (2)
• All other branch connections at the same floor are harmless provided that the
length of the branch is at least 1 m and there is a regularly discharge and/or the
water traps are situated min. 100 mm above the branch to flush away possible
contamination.
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Headline in Helvetica Neue Light
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Thanks for your attention
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