Old Male Cast Iron Screw Pipe Fittings

[ladiesman020]

Hiya I need some help on this one. I live in a 1935 council house with kinda old pipes. No combi boiler just water heater & storage heaters. I'm wondering if I can remove the old threaded pipe and put a male compression fitting soo I can run a new piece of 15mm pipe to my bathroom.
The bathroom cold water is run from an old tank in the loft which strait above the bathroom and only serves the toilet, sink & bath ONLY. It seem a bit stupid t have a cold water tank nower days that only serves the bathroom and the pipes are at One side and ugly. I only want to do it as a short term fix for 6 months then a new bathroom and all new plumbing
Was thinking bout these parts.
http://www.wickes.co.uk/Compression-Male-Iron-Coupler-15mm/p/420210
http://www.wickes.co.uk/Compression-Male-Iron-Coupler-15mm/p/420226
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[footprints]

Item 9077 would be better I think the ones you are looking at are parallel threads a taper thread will be better.

http://www.bes.co.uk/products/141.asp?EPBOE=#9077

Local plumbers merchant should be able to help.

 

[ladiesman020]

Would this be the one / O.K
http://screwfix.com/p/conex-male-straight-connector-taper-302ta-15mm-x/73198

 

[footprints]

Yes that's fine, iron fittings usually have taper threads so as you screw the taper male into the taper female they gradually tighten form a tight joint. Parallel threads run all the way up to the end before they tighten which can be a help in tight situations but can be a particular pain if the fitting is an elbow and insists on tightening in the wrong position

Both joints of course need jointing compound & hemp or PTFE tape but on taper fittings the joint is a good snug fit which helps the sealant to seal, on parallel threads the seal relies totally on the sealant.

 

[ladiesman020]

Oh I see, thanks for the help, learning all the time. I've 15 rolls of PTFE tape so I though that's what to use as it's used in most compression work.
One thing to ask is there any think I should doo or look out for when un screwing the old pipe. I don't wanna break the thread in the old female tee.
Also ain't running upstairs cold water off the tank a bit old hat nower days when most mains water is strong enough to reach up the the loft in the first place. My Water Pressure from mains is 5.5bar

 

[footprints]

Steel pipe is tough as old boots unless it is badly rusted. Yours looks in good nick, remember to "hold against yourself" that is when turning the fitting off put grips on the section of pipe that is to remain, otherwise you may "crack" the next joint along the line causing a leak.