Steel pipe in CH system

[Richard]

Hi Ed,

Certainly trying to fit a 15 mm solder fitting was not possible.

Richard

[Richard]

How the devil do I achieve a rolled flange? And yes, there does appear to be a welded seem along the length of the tube.

Richard

[Dave Plowman (News)]

Compression fittings need a high standard of surface finish on the pipe to stand a chance of working. A threaded adaptor would be the way to go.

[Baz]

Hi Richard. What I am saying is. You have PIPE not TUBE. You need a 1/2" Nominal Bore compression fitting. Or a DN15 compression fitting, which is the same thing but metricateted. Take your bit of offcut to your local Builders merchants and they will sort it out for you.

BTW. What fitting did you have on the Pipe at the start? Baz

[Dave Plowman (News)]

For bundy tube, you use a special tool.

Which is why a compression fitting won't work. To joint iron barrel, which is what this is, you use screw on fittings. So you'd have to thread the cut end. And you can then get a fitting which screws on and allows connection to copper.

[Richard]

Hi Baz,

My neighbour is the lucky chap with this pipework, not me thankfully.

Anyway, he seems to have a 21.5 mm main feed around the first floor and tee-ed of this are the feeds to the rads (in slightly more than 15 mm pipe). The thin stuff is attached to the rads with compression fittings and to the larger stuff by what appear to be brass soldered joints. They're not like copper Tee fittings where the 15 mm meets the

22 mm at right angles, but look as if the thick pipe sweeps into a 90 deg bend that also reduces to join the thin pipe. But the thick pipe also continues straight across through the joint. Sorry that's a diabolical description and I can't even provide a photo as he is away.

Richard