Mains gas pipe query

  CurlyWhirly 21:02 28 Nov 2010

I live in an old house that has no physical DPC installed and I have recently had a problem with rising damp but it's sorted now - I hope !

However I've noticed that the mains gas pipe is corroding as the part of the pipe that is coming through the wall on the inside has a ring of damp around it.

As that particular wall has now been damproofed I should be okay but I'm just curious as to what would happen if gas was leaking out of a corroded pipe as the section of pipe that I'm referring to comes BEFORE the gas shut-off valve and so shutting off this valve would serve no purpose !

I wonder what Transco would do in this situation ?

Outside the gas pipe goes directly into the ground so I'm assuming that there must be some sort of on/off valve underground ?

p.s. I can't be certain that the damproofing will be successful on this particular section of wall (aprox 3 ft in length) as my stone walls are 18 inches thick and should really be pumped from both sides but, due to the gas meter cupboard being in the way, it was only possible to pump that particular section of wall from the outside.

  Forum Editor 23:13 28 Nov 2010

is that any gas pipe that passes through a wall must be enclosed in a section of non-corrosive pipe - usually plastic.

Your pipe is obviously the older iron type - what used to be referred to as 'barrel', and it will corrode, although it takes a very long time to corrode to the point where the gas will leak.

The National grid is now responsible for all underground gas pipes up to the pre-meter terminal valve. If you're concerned about corrosion you should talk to them.

  Dragon_Heart 01:59 29 Nov 2010

Both uk-wizard & FE are correct.

In our case they pushed a new yellow pipe ( indicates it's gas ) through the old pipework. Made a new connection at the main AND put our gas meter on the outside wall. ( The metrer reader still left 'not in' cards several times despite the large white blob with a gas symbol on the wall ).

Even if you have copper pipework it is best NOT to have brickwork render or motar in contact with it.

  BT 09:09 29 Nov 2010

We had a gas leak just outside our front gate under the pavement.
The gas company replaced the whole pipe from the main to the house by driving a 'Mole' underground the whole 20 yds right up to the house. They just had to dig one small hole where the pipe came up next to the house, and one halfway up the driveway.
At the same time they moved the meter to a white box outside and replaced all the pipework into the house.

  namtas 14:03 29 Nov 2010

If you think about it, having full control up to the valve is perfectly sensible to me. It really would not be a good idea for a gas company to have to seek authority to deal with a gas leak where the customer was either not available or not cooperative.

  Forum Editor 17:30 29 Nov 2010

No, don't phone Transco. As I said earlier, the National Grid is responsible for transporting gas on the underground pipe network, and up to the meter terminal valve.

If you're worried about the safety of a gas pipe outside your house, or if you smell gas, there's a National Grid help number which you call for advise and assistance:-

0800 111 999

  Forum Editor 17:35 29 Nov 2010

You are entirely responsible for the mains water supply pipe that runs under the ground on your property, once the pipe leaves the water supplier's shut-off valve.

If there's a leak you are obliged by law to have it repaired to prevent a waste of water, although some water suppliers will repair it for you, free of charge. They aren't obliged to do it, however.

  Forum Editor 17:37 29 Nov 2010

In the case of a leak on a gas supply pipe, The National Grid has a right of entry onto your property for the purposes of making a repair.

  Forum Editor 18:09 29 Nov 2010

up to the isolating valve on the supply side of the meter."

I'm afraid that's wrong. Your gas supplier simply sells you the gas - it has no responsibility for the pipes through which the gas flows.

The pipes are the responsibility of your regional gas transporter. There are eight regional Gas transporter networks in the UK.

It gets complicated. In 2005 The National Grid sold four of the eight regional gas distribution networks to Scotia Gas Networks. That company owns Southern Gas Network and Scotland Gas Network, Northern Gas Networks and Wales & West Utilities.

  Forum Editor 18:45 29 Nov 2010

Nothing changes.

click here

  Forum Editor 19:33 29 Nov 2010

Transco has never been a gas supplier.

The company was a gas transporter, and it no longer exists as Transco - it is now called National Grid.

This thread is now locked and can not be replied to.

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