Plastic gas main

Bay Man · 2010-10-01T08:13:26+00:00

In a road near me, the put in a new yellow gas main, by running itdown the old iron gas main. It is a smaller bore of course.I noticed they did the same across the gardens, running what is theequivalent of 1/2" yellow plastic through 3/4 and 1" iron main pipesto each house. One house has what looks like a 1 1/4" iron main pipe(looks like original 60s or 70s), at the meter it has what looks likea 1 1/4" to 1" reducer, a small short piece of 1" steel pipe, then a1" to 3/4" reducer, with two, what looks like a 1/4" plugs in the 1"to 3/4" fitting, with then short piece of 3/4" steel pipe and then abrass maintap on that.Does anyone one know what the "two" plugs are for?How did they connect the plastic onto the house meter? Connectingonto the 1 1/4" steel pipe under the ground?Will a house that has a large combi using a 1" main gas pipe be OKwith a 1/2" mains plastic gas pipe? 1/2" looks way undersized to me.If ant of these house upgrades to a larger higher water flow combiwill they be in problems?All this plastic gas mains looks like a cheap way of upgrading themains for the gas company's benefit, not for the benefit of the housewho may be short changed on a gas supply.

Oct 01, 2010 21 Replies

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Andrew Gabriel 15 years ago

Yes. Actually, the pipe capacity of the high pressure natural gas network is a significant proportion of the country's gas storage.

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harry 9 years ago

The old coal gas was at very low pressure, ISTR less than 1/2psi. The new gas mains run at various pressures. So the new pipes can be much smaller. Plus they are smoother inside with longer radius bends.

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