On Wed, 22 Oct 2003 09:02:05 +0100, Dougie Nisbet
wrote:



I suspect I won't find one. The reason I say that is that the house has a
raised floor and a lot of the CH pipework (22mm plastic) runs underneath
the floor. Now that I know what I'm looking for I'll go underground and
have another look - but presumably if there is one below the floor it'd
have limited effectiveness as the water would have to go uphill to get to
a drain. It was a factor in my thinking about trying to go down the route
of forcing water around the entire CH system as it's possible that a lot
of the 22 mm pipework under the floor will be acting as a sump and
collecting gunge.


In that case I take your point that there may be sludge build up in
the pipes.

Given these circumstances, I think I would probably put drain cocks in
the 15mm pipes going up to the radiators or in the 22mm below the
floor in several places. In the latter case you would force the
crud out under pressure anyway. In plastic, this is very easy to do
but you should use a proper pipe cutter and not a saw.



www.bes.ltd.uk

Drain Cock 10529

Tee 7080 (15mm)

Tee 7082 (22x22x15mm)

Cutter 7141



My thinking in having the exit point(s) close to the radiator is to be
able to get the crud out of the system close to where it is being
generated (largely the radiators.) Over longer lengths of pipe it
may settle out and then you have merely distributed it further.



..andy

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