Re: What's a Gas Siphon

message from tarquinlinbin on 22 May 2004

Its a connection point on a gas main from which water,MEG and other
liquid substances can be extracted by use of a compressor,commonly
called an Alan Taylor unit (ATU) presumably after the inventor. Even
on modern plastic systems,there is still water and other liquids in
mains which needs periodic extraction. It varies from area to area.
Some areas have nothing others have plenty,sometimes to the point of
loss of supply due to the mains filling up!!

joe

Andrew May replied to tarquinlinbin on 23 May 2004

So where is it likely to be. It's not by the meter because that is much more
than 2'6" from the front hedge. But there is nothing else nearby excpet for
a sewer cover. At least I had always assumed that it was for the sewers,
perhaps its not.

Set Square replied to Andrew May on 23 May 2004

It's directly *under* the gas main, with just a 1" pipe coming to the
surface. Maybe there's a little square cover (about 5" x 5") with "Gas"
embossed on it?

Ian Stirling replied to Andrew May on 23 May 2004

Well, a reasonable approach might be to take a tape measure, and
measure out a circle 2'6" in radius.
This might take a while, as it's a lot of walking.
Then look carefully round the edge.

Dave Liquorice replied to Andrew May on 23 May 2004

Open it up and have a look...

IMM replied to tarquinlinbin on 22 May 2004

You will find that if water is in the gas main, it came from inside the pipe
via a poor seal or whatever. Yes, you are right, even in modern systems the
low point will have a syphon to collect debris and an water collected.

You know when there is too much water in a pipe. The gas supply is on-off
as the gas disturbs the water in the pipe.

Archived message: Re: What's a Gas Siphon (UK DIY Home Renovation)