"Tim S" wrote in message
...
YAPH coughed up some electrons that declared:

some sleeving where the pipework went through the
wall as Not to Current Standards since (as he explained to me) he
couldn't
identify the material used for the sleeve so couldn't be sure it
complied
with the regs.

Silly question: the sleeving isn't there to carry gas, but rather to
protect
the pipe surely?

Cheers

Tim

Both.

It must be capable of containing or distributing gas.

When a pipe goes across a cavity the sleeve is meant
to prevent any gas escaping into that cavity and building
up into a dangerous situation.

One end of the sleeve will be left open to carry away any
leaks (usually to the out side air.