Simple question: can the boiler 20mm
condensate pipe commonly used be bent enough to get it fed through
25mm holes in joists that are 400mm apart ?
Thanks,
Simon.

On Mar 12, 10:31*am, sm_jamieson wrote:
Simple question: can the boiler 20mm
condensate pipe commonly used be bent enough to get it fed through
25mm holes in joists that are 400mm apart ?
Thanks,
Simon.

Just to clarify, I obviously mean getting the pipe into central holes
in the joists
when the next joist along is untouched, forcing it down between 2
joists and into the holes.
Simon.

sm_jamieson wrote:
On Mar 12, 10:31 am, sm_jamieson wrote:
Simple question: can the boiler 20mm
condensate pipe commonly used be bent enough to get it fed through
25mm holes in joists that are 400mm apart ?
Thanks,
Simon.

Just to clarify, I obviously mean getting the pipe into central holes
in the joists
when the next joist along is untouched, forcing it down between 2
joists and into the holes.
Simon.

Can I just ask why a condensate pipe needs to be 20mm? I was looking at a
condensate pump recently, and the outlet pipe seemed to be about 5mm.



--
Murphy's ultimate law is that if something that could go wrong doesn't,
it turns out that it would have been better if it had gone wrong.

On Mar 12, 12:00*pm, "GB" wrote:
sm_jamieson wrote:
On Mar 12, 10:31 am, sm_jamieson wrote:
Simple question: can the boiler 20mm
condensate pipe commonly used be bent enough to get it fed through
25mm holes in joists that are 400mm apart ?
Thanks,
Simon.

Just to clarify, I obviously mean getting the pipe into central holes
in the joists
when the next joist along is untouched, forcing it down between 2
joists and into the holes.
Simon.

Can I just ask why a condensate pipe needs to be 20mm? I was looking at a
condensate pump recently, and the outlet pipe seemed to be about 5mm.

I think 20mm is the "standard".
Actually I was thinking of running part in 32mm (!) just in case it
ever got blocked (and/or)
I could then use it for a basin if I ever wanted one in the room near
the boiler.
Anyway, 10mm is fine for central heating you might say.
The difference is the condensate is dribbling out and has to drain
using gravity so it is
moving slowly and more liable for deposits to collect (although it
should be pure water ?)
or even surface tension to have an affect (at 5mm).
If pumping you can allow for a smaller bore, but still 5mm seems a bit
small.
Simon.

sm_jamieson wrote:
On Mar 12, 12:00 pm, "GB" wrote:
sm_jamieson wrote:
On Mar 12, 10:31 am, sm_jamieson wrote:
Simple question: can the boiler 20mm
condensate pipe commonly used be bent enough to get it fed through
25mm holes in joists that are 400mm apart ?
Thanks,
Simon.

Just to clarify, I obviously mean getting the pipe into central
holes in the joists
when the next joist along is untouched, forcing it down between 2
joists and into the holes.
Simon.

Can I just ask why a condensate pipe needs to be 20mm? I was looking
at a condensate pump recently, and the outlet pipe seemed to be
about 5mm.

I think 20mm is the "standard".
Actually I was thinking of running part in 32mm (!) just in case it
ever got blocked (and/or)
I could then use it for a basin if I ever wanted one in the room near
the boiler.
Anyway, 10mm is fine for central heating you might say.
The difference is the condensate is dribbling out and has to drain
using gravity so it is
moving slowly and more liable for deposits to collect (although it
should be pure water ?)
or even surface tension to have an affect (at 5mm).
If pumping you can allow for a smaller bore, but still 5mm seems a bit
small.
Simon.

--
Murphy's ultimate law is that if something that could go wrong doesn't,
it turns out that it would have been better if it had gone wrong.

sm_jamieson wrote:

I think 20mm is the "standard".
Actually I was thinking of running part in 32mm (!) just in case it
ever got blocked (and/or)
I could then use it for a basin if I ever wanted one in the room near
the boiler.
Anyway, 10mm is fine for central heating you might say.
The difference is the condensate is dribbling out and has to drain
using gravity so it is
moving slowly and more liable for deposits to collect (although it
should be pure water ?)

No it's got some acid in it from the dissolved carbon dioxide. I'd have
thought that would prevent any carbonate build-up even in the presence of
air.

or even surface tension to have an affect (at 5mm).

If pumping you can allow for a smaller bore, but still 5mm seems a bit
small.

It might be more than 5mm. Take a look at picture 2 here
http://www.screwfix.com/prods/27313/...-Acid-Disposer
What size is the flexible tubing would you say?

On Sat, 12 Mar 2011 02:53:12 -0800, sm_jamieson wrote:

On Mar 12, 10:31Â*am, sm_jamieson wrote:
Simple question: can the boiler 20mm
condensate pipe commonly used be bent enough to get it fed through 25mm
holes in joists that are 400mm apart ? Thanks,
Simon.

Just to clarify, I obviously mean getting the pipe into central holes in
the joists
when the next joist along is untouched, forcing it down between 2 joists
and into the holes.
Simon.


Possibly, otherwise use 22mm PB or PEX - the o/d of overflow is nominally
about 21.5mm (not 20mm) and can be joined using push-fit couplings.
(Since the pipework isn't under pressure mechanical grip onto the smaller
pipe isn't really an issue.)



--
John Stumbles

Pessimists are never disappointed