Had a corgi regged gas fitter in to estimate putting in a new stove,
whilst there he said I must get the pipes through the wall from the
meter refitted as they are not sleeved. Had another fitter came also
corgi registered and he said it was not necessary. Anyone know the
Really they should, but if there is no sign of corrosion or damage and its
not a meter box were the pipe comes through the wall, there should be no
problem. Its what is called "Not to current standards" the lowest
classification on unsafe situations.
ANY gas pipe passing through a cavity wall must be sleeved with a gas tight
sleeve to prevent the possibility of a corrosion or damage caused leak to
the pipe resulting in the cavity filling with gas. Its also currently
expected practice to sleeve through all walls (even solid or single
brick/block) to protect the pipe from mechanical or corrosion damage. As a
pre-existing installation its NCS (not to current standards) and therefore
at risk. Your first installer is right. I'd suggest you go with his advice
and have the sections of pipe passing through the walls sleeved. Certainly
you should beware of corrosion leaks developing slowly within the wall.
Yup, they must be sleeved, partly to protect the copper pipe from
corrosion due to its being in contact with brickwork which may have
various salts and other stuff in it which could attach the metal, and
partly to protect it from mechanical damage due to movement of the
masonry itself. If it's possible to make enough of a gap around the pipe
to slip maybe a slit length of plastic pipe or cut up squeezy liguid
bottle over the pipe that'd do. You need to seal the gap between the
pipe and the sleeve at the indoors end: any non-cracking filler should
do e.g. frame filler, decorator's caulk, silicone, plumber's mait.
 and here's one we made before the programme. :-)
ISTR that it is a must for cavity walls in case the pipe should develop
a leak mid cavity so a build up of gas might go bigga banger should it
Other than that doesn't seems like a bad idea just to allow for
To allow for structural movement, shouldn't the sleeving be strong enough
to protect the copper gas pipe. I think that the plastic bottle would fail
in these circumstances, however, a deformable plastic sleeve would still
allow an escape path for leaking gas.
There's no requirement in the standards (BS6891 IIRC) for the sleeving
to have any particular strength. I think the idea is just that it allows
some space between the pipe & masonry whereas if the pipe's fitted in
tightly any movement will damage it.
On Sun, 12 Sep 2004 18:01:08 +0100, Andy Hall wrote:
Indeed. Many cements attack copper when damp.
I have been to more than one 70's flat where the CW pipes were not adequately
wrapped and the pipes have sprunk a leak.
AIUI the sleeve allows for two problems:
One: it lets the building settle a
little without straining the pipe.
Two: if a leak did occur it will encourage it to vent outside.
As a further precaution pipes go through cavities directly and without
Ed Sirett - Property maintainer and registered gas fitter.
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