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What size pipe and fittings is it?
You can use normal MI or galvanised.
A 6.5m lengtht of 1" mi galv is around 30 odd quid. Split unions are about 3 or 4 and bronze to iron about a pound dearer

It's inch and half. For a 3 metre length in bss it 33+vat. Need the special flat faced union as no play on the pipework for normal union.

I thought you weren't allowed to use galvanised on gas
 
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Picked this up today simon johns. Is that what you were talking about?
 
Yes a little bit of play, a couple of mm am sure they can get. better than the other unions. And it was only £19 from Harris & Bailey. (Big thank you from heliotrope for pointing me to them). What paste do you guys use?
 
I get you now cropster. Don't know about having trouble putting them in, but, trying to get hold of those flat faced unions is a nightmare. I hope the above one will judt manage it. Otherwise it is off to plumb centre for a £66+vat wrought flat faced.
 
Are you not able these days to just thread the pipe a bit longer and then use back nut? With paste it wouldn't leak like ptfe does if you unwind it a bit after tightening it up too much
 
Use loctite 55 on your threads mate with bit of gas paste ,

like simon says i use bit of paste to aid the seal gas paste on gas but each to their own
 
Am getting quite a bit of commercial work now. Mostly due to churches passing my name on.

For the 2 for the day £500. Which I think is reasonable. then £90 for nitrogen to purge system. It is a bigger job than I realised really. Plaque heaters with pilots that need to be re-lit and that requires scaffold. Will remember next time though to add more to my quote.
 

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