Gas - mixing galvanised, cast iron and copper

jacko555 · 23 Feb 2021

Just curious really.

Is it allowed to mix the 3 types of gas pipe?

Am reworking the kitchen and gas man came to quote to disconnect/decommission the gas pipes we have, and run new copper pipe to the cooker and boiler.

This was my request, rather than necessity, as he can route the new ones out of sight, rather than what we have (cast iron running up walls, appearing in odd places, like the hallway wall, etc etc etc). He will leave the cast iron pipes "safe", so I can remove as I continue ti renovate the house.

Anyhow, he looked at the current setup and said it was bad, as there new galvanised connectors from the meter, connecting to old cast iron that feeds the house, then an adaptor to copper from cast iron, to feed the combi boiler and existing cooker.

Just curious really, as it's all going tomorow, but was it against any regs, or just "bad practice" to mix, or, was it fine?

muggles · 23 Feb 2021

More likely to be the pipe sizing than the mix of materials that's the issue there.

ianmcd · 23 Feb 2021

jacko555 said:
cast iron running up walls, appearing in odd places,

You wont have cast iron gas pipes inside your house

jacko555 · 23 Feb 2021

ianmcd said:
You wont have cast iron gas pipes inside your house

Gas man said they were cast iron. Maybe he meant the connectors? Pipes arent copper

Jackrae · 23 Feb 2021

None of the pipes or fittings you show are cast iron. The couplings are forged steel. It gives cause for concern that the "gas man" thinks they are cast. Next time you see him I'd suggest you ask to see his 'gas-safe' ticket

jacko555 · 23 Feb 2021

Fair enough. Even the old black pipes in the background?
Fwiw, he is gas safe registered (at least the van says so) although check it out tomorrow.
Thanks for the heads up

ianmcd · 23 Feb 2021

will be Malleable iron or steel, wont be cast

JimCrow · 23 Feb 2021

Not cast iron as such, but malleable iron pipe fittings are cast iron fittings,

Gasguru · 24 Feb 2021

There's nothing wrong with any of that pipework and it looks as though the outlet pipework is actually giving support to the gas meter (the bracket is probably not screwed to the floor). Unless the meter bracket is fixed a copper outlet pipework will give less support.
If you had some old lead composite pipework then I would advise replacement but not for MI.
In fact many countries ban copper due to it's propensity to react with the gas and cause copper sulphide...that blocks gas valves. Happens here from time to time.

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Gas - mixing galvanised, cast iron and copper

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