Gas pipe query

[stavrosk83]

Hi there,

I recently had a plumber in to do some works on the house, and would like to query one of the jobs he has done.

The gas pipe to our halstead ace high boiler was originally a 15mm run which i must admit took a rather long route to go round half of the kitchen before it got to the boiler. So the plumber advised us to bypass most of this and install a 22mm gas pipe which would increase the flow of gas to the boiler which would help when running the bath etc. So with this advice i decided to go ahead with it.

Now the works are complete, i notice that the pipe from the main has indeed been upped to a 22mm, but about 2 feet before the pipe goes into the boiler, it steps down to a 15mm pipe.

Does anyone know if this defeats the purpose of the whole excersise of changing up to 22mm? To me this seems like you've still got the same restriction of the flow? Thanks for any help!

 

[powell30]

Stepping down the gas line won't make that much difference. and is required if your boiler calls for a 15mm connection. The RGI is correct that a 22mm line will be able to carry more gas, but unless it was undergassed previously (against regs) it won't make a difference to how the boiler operates.....as long as it was recieveing the correct amount of gas to burn efficiently in the first place. I would trust your RGI. And don't worry that the line has been reduced.....it's just to get onto your boiler.

 

[gasandoilman]

im sure your gas guy done a working pressure test to check this out