The incline of the condensate pipe

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Madrid

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Hi Guys

Is there a problem if I would like the condensate pipe to run from the new boiler cupboard in the right of this picture - under the floor boards - to join the soil stack or shower waste pipe - in the left of this picture. Is the incline sufficient to take the waste condensate away.

I don't want the pipe to run along the wall. I am putting a shower into that space. The plumber would like to dab and plasterboard over the walls on which the new condensate pipe has been adhered. The pipework for the shower will run behind the plasterboard and will be channelled into the wall.
 

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[GALLERY=media, 101191]IMG_0339[1] by Madrid posted 4 Mar 2018 at 5:19 PM[/GALLERY][GALLERY=media, 101192]IMG_0341[1] by Madrid posted 4 Mar 2018 at 5:19 PM[/GALLERY]
 
Pour 1ltr of water through the pipe and measure what comes out the end. If you see 1ltr.......it works!!
 
basically you need 18mm of fall per metre, make sure it's supported properly
 
John, is that an average of 18mm fall per meter - or could it fall 600 mm immediately after leaving the boiler and travel 1400mm to soil pipe with no fall at all?
 
Madrid said:
John, is that an average of 18mm fall per meter - or could it fall 600 mm immediately after leaving the boiler and travel 1400mm to soil pipe with no fall at all?
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No, minimum fall is as specified, you need to support the pipe adequately to maintain the fall.

Having said that given it's clean water you could go lower, but I wouldn't recommend level on any case.
 
Thank you - so the advice is that I must maintain the fall by at least a 1/2 inch drop for every meter of pipe length. Okay that seems easy for an under floor pipe. Over the course of the width of the bathroom which is 1400mm the pipe must drop 25mm or 1 inch.
 
Crap maths; at 12mm over a metre, you only need a 17mm drop for 1400mm run.
 
As an aside, if you have an air break at the boiler end after its trap, there would be less risk of bad stuff if the pipe did become full due to inadequate fall.
 
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