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Pipe to Value coupling (female) rusted - how to clean?


 
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auslan

from United Kingdom

Joined: 22 Jul 2007
Posts: 5
Location: London,
United Kingdom

PostPosted: Sun Jul 22, 2007 9:54 am Reply with quote

I'm getting new carpets laid down next month - and want to fix one particular radiator first.

At the locksheild value (water exit) of this radiator, the coupling is leaking and has rusty water drips down on the pipe. I've disconnected the radiator from the wall and will soon flush all radiators AND use a Central Heating System's cleaning solution, thence a Anti-Corrision liquid at the end.

However the screw threads of this coupling's female nut has rusted. Its affixed to the pipe with a 'kink' at the top of the pipe to stop the nut from coming off. In other words, I can't get this nut off to clean the threads OR to replace it.

Is there a way I can clean it easily? Any quick-remove rust solution to brush it into the nut? Or is it a job for the plumber to cut & replace the coupling?

hope you could help.
- Andrew
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EliteHeat

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PostPosted: Sun Jul 22, 2007 10:21 am Reply with quote

Whilst I don't pretend to understand the question, I can say that the "female nuts thread" is probably not what is causing the leak.

If the radiator is drained you can:-

1) Use a bit more force to undo whatever connection you are talking about
2) Cut through any connections, they'll definitely come off then
3) Replace the whole radiator
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auslan

from United Kingdom

Joined: 22 Jul 2007
Posts: 5
Location: London,
United Kingdom

PostPosted: Sun Jul 22, 2007 12:31 pm Reply with quote

thanks for your reply. Let me explain a bit further.

The radiator is already taken off. The locksheild & handwheel values are also off. What is left - is the two pipes coming up from the floor. At top of these two pipes, a connector nut each. In other words, half of the coupling. This is the 'female' part I'm talking about.
- Now, one of them was leaking due to a poor seal. When I drained the central heating system, I checked the water being flown out - it was clean. So the 'leaky rust' was simply a reaction to the leak coming from the poor seal at one of these couplings.
- Because of the rust, if you look inside the nut - the screwed threads have already rusted a bit. How do I clean this, this is my question?!
(To avoid having to call a plumber to come and cut the pipe off, attach a new pipe just to change the female connector - worth only 1 or so!)
- The other part, the male connector of this coupling at the bottom of the locksheild value, is easy to clean - with a wire brush. However the female connector has the pipe through it, I can't use a wire brush - hence my original query.
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breezer

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PostPosted: Sun Jul 22, 2007 12:35 pm Reply with quote

change the whole valve since the system is drained down

only need a couple of spanners
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Softus

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PostPosted: Sun Jul 22, 2007 1:54 pm Reply with quote

auslan wrote:
Because of the rust, if you look inside the nut - the screwed threads have already rusted a bit.

I doubt it - the nut is likely to br brass.

Quote:
How do I clean this, this is my question?!

Don't bother - just clean the olive and the mating face of the valve, wrap 3-4 turns of PTFE around the mating face of the olive, and reconnect.

If you think it's unlikely to seal, then buy an olive cutter and replace the nut and olive.
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auslan

from United Kingdom

Joined: 22 Jul 2007
Posts: 5
Location: London,
United Kingdom

PostPosted: Sun Jul 22, 2007 5:34 pm Reply with quote

thanks to Softus for that reply. Until now, I didn't know what an olive is - in terms of plumbing / piping. I was in the hardware shop this afternoon and took a quick look at the Plumbing section.

Ah! I thought that the 'kink' at the top of the pipe was done in place by a plumber using heat gun or whatever. It was actually & simply an olive that can be removed without damaging the pipe. Since I wanted to replace the nut rather than having to clean it, I've cut the olive off (very carefully using a hacksaw, didn't cut the pipe at all).

From the hardware shop, I now understand that these female connectors are made of brass. It was nevertheless worn out / corroded due to previous tenants / plumbers' efforts. Also the internal thread was not in a good condition.

Many thanks - I can easily fix this tomorrow - with a new brass connector & new olive.

- Andrew
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Softus

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PostPosted: Sun Jul 22, 2007 5:56 pm Reply with quote

You're welcome.

If you're replacing the nut (aka female connector icon_wink.gif), then be aware that there are different threads around, so not just any nut will do.

Also, if it were me, I'd replace the whole valve now, rather than refit an old one.
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breezer

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PostPosted: Sun Jul 22, 2007 6:33 pm Reply with quote

Softus wrote:
Also, if it were me, I'd replace the whole valve now, rather than refit an old one.


which is what i said 5 hours ago icon_lol.gif
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Softus

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PostPosted: Sun Jul 22, 2007 6:43 pm Reply with quote

breezer wrote:
which is what i said 5 hours ago icon_lol.gif

Well if you'd helped the OP get the nut off, instead of just laughing-out-louding, it might have been resolved more quickly.

And let's be sure about one thing breezer - you ain't no plumber. icon_rolleyes.gif
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auslan

from United Kingdom

Joined: 22 Jul 2007
Posts: 5
Location: London,
United Kingdom

PostPosted: Sun Jul 22, 2007 8:54 pm Reply with quote

breezer, just a note to say that you merely stated 'replace old value'. You didn't mention the olive, or how to change the coupling.

In fact, it was the coupling (female connector & olive) that I'm replacing. The values (locksheild & handwheel) are left intact. Definitely not replaced as they're OK.

In any case, thanks to everyone who helped in various ways. That's why I asked in DIYnot before resorting to a plumber just to replace that cheap nut!

- Andrew
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ChrisR

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PostPosted: Sun Jul 22, 2007 9:06 pm Reply with quote

Good luck with tryning to buy a new nut and olive alone. You may have to buy a chrome plated stop end, or similar.
If you can't get one, wait until a friendly looking plumber approaches the shop - we all have spares left over!

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auslan

from United Kingdom

Joined: 22 Jul 2007
Posts: 5
Location: London,
United Kingdom

PostPosted: Sun Jul 22, 2007 9:08 pm Reply with quote

Quick addendum - why I figured that the values are OK, is simply that the house is only 7 years old, thus the same age for the CHS. If I replace these 2 values, then I ought to replace other values of radiators I'm taking off to flush with a hose?!!

Don't fancy that extra expense, but just wondering why its worth replacing a value each time one replaces a coupling? The value's male thread is OK where it used to 'mate' with that female bit I've knocked off. (just can't resist saying that aloud).
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