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WASTE PIPES (Read 4434 times)
Dusty
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WASTE PIPES
Jul 27th, 2004, 7:46am
 
I’m building a new kitchen and relocating the sink, washer & dish washer Shocked
Can anyone help with some guidance Undecided
For the WM & DW what length of drop should each waste pipe have Roll Eyes
As the distance will be 3m, what angle should I have on the horizontal waste pipe going from the 2 machines to under the sink 8)
Do I need 2 U traps, one for the sink and one for the machines Smiley
Thanks
Dusty Cheesy
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billythekid
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Re: WASTE PIPES
Reply #1 - Jul 27th, 2004, 1:23pm
 
i seem to remember for self-cleaning a drop of 1:20 is optimum(guys correct me if i'm wrong) this is quite steep for a waste. Any run is good in practice as long as it always drops, i.e no flat/level sections. You should have a seperate trap'U Bend' for each appliance.
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PEDANTICVINDICTIVEMAN
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Re: WASTE PIPES
Reply #2 - Jul 27th, 2004, 3:58pm
 
I know drains underground have to have whats called a self cleansing fall which I "think" is 1 in 40.
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jasonB
Re: WASTE PIPES
Reply #3 - Jul 27th, 2004, 8:17pm
 
For soil pipes to domestic dwellings use Maguire's rule which is as follows:

Gradient = pipe diameter in mm divided by 2.5

Therefore 100mm pipe Div 2.5 = 1 in 40

for smaller waste pipes aime for 2.5 degrees thats why a waste elbow is actually 92.5 degrees and not 90 deg's. which using triganomitry gives approx 1 in 20.

Jason
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thescruff
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Re: WASTE PIPES
Reply #4 - Jul 30th, 2004, 8:36pm
 
For solids the recommended fall is 1-40, for liquids 1-20 is a minimum but no maximum.

scruff
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scotspark
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Re: WASTE PIPES
Reply #5 - Aug 6th, 2004, 9:18pm
 
thot the gradient would be steeper for solids
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thescruff
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Re: WASTE PIPES
Reply #6 - Aug 7th, 2004, 12:34am
 
No 1-40 is the ideal as any steeper and it leaves the solids behind.

scruff
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