longest run for horizontal soil is 6 metres, but what about when u add bends

[kay-jay]

Note: If you are installing a new soil stack or drainage system, or significantly altering an existing system, you will need to inform the Building Control Department at your local Council. You will need to demonstrate that the work carried out conforms to Building Regulations: England & Wales or Scotland

same source

 

[nicglee]

I want to run a soil pipe from a washing machine for about 4 metres dead horizontal with a couple of bends (and then slope to join a bath waste) in probably no more than 2 inch pipe. Can any one advise if I can get away with this? Perhaps only using washing liquid and not powder? And if I'm able to access the pipe to clean out every now and again (how often is advisable)?

 

[kay-jay]

I want to run a soil pipe from a washing machine for about 4 metres dead horizontal with a couple of bends (and then slope to join a bath waste) in probably no more than 2 inch pipe. Can any one advise if I can get away with this? Perhaps only using washing liquid and not powder? And if I'm able to access the pipe to clean out every now and again (how often is advisable)?

Dead horizontally is never a good idea. Over the 4m run you should ideally aim for a min of 72mm fall

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[Simon F]

hi i understand the longest run you can have on soil is 6 metres (horizontally), but what about when you add bends, is there a equation? or do certain bends equant for .25 of a metre or anything?
any advice would be greatly aprreciated
cheers

is the 6m rule not to be seen the same as other measurements in the building regs.
for example 40mm pipe max length 3m, but add some means of venting like a hepvo valve to go longer.

 

[stevetheplumber]

max length is for one pipe soil systems if its vented there is no real limit
fall for 4 inch pipe is 1 in 40
when i do a number two at home it goes into the thames 7 miles way work out the fall on that lol

 

[Simon F]

do they still empty straight into the Thames, I thought the Victorians changed it to go direct to the sea.

 

[TGor]

i have a 45m run to price is industrial ,but is not for toilet is for wash basin .....
any suggestions on that ! will have a 4 wash basin sink to 4" pipe + 2 sink with saniflo been pumped from like 20m run

If this is installed as a vented branch serving washbasin and sink .. it's not classed as soil as far as I know .. The maximum run for a 50mm vented branch serving 6-10 washbasins is 10 metres only (this dimension is over all bends and changes of direction) and the gradient should be between 18 & 44 mm per metre There is no limit to the number of bends in that length of run but the advice given by others regarding use of long Rad or 45's is sound.
But if you design this as above ground drainage then the drainage rules can apply .. The branch discharge pipes from the macerator should be connected directly to the drain, as short as possible and if you can put them down-stream of the washbasins so that there is a chance that the washbasin discharge will keep the stuff moving. Depending on the layout you might need to vent the appliance discharge pipes and the end of the horizontal drain.

: )

 

[kay-jay]

Well when i read the op i assumed he was confusing his pipes. My assumption was that by soil pipe he meant waste seeing as it comes from a washing machine and will branch into waste from bath hence my advice for a min fall of 18mm per metre

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