[modeleng] Re: Boiler blues
- From: "Phill Smith" <steam@xxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Mon, 12 Sep 2005 23:45:33 +0800
Barrie,
The carbon that is coating the tubes is something that it is wise to remove,
as it is a great insulator.
There are 2 ways to remove it.
The first, and easiest but not always reliable, is to use products like
"Killsoot", which are for removing soot from fireplaces and chimneys. They
don't always work first time round, so 2 or 3 packets are required, and the
boiler needs to be up to operating temp.
The second is with a brush.
I use a hard steel brush that is 0.02" under the ID of my tubes, on a long
rod and powered by my electric drill. The brush must be run slow. Really
slow. And gently, so as to slowly break away the carbon. I always rod
(brush) my tubes by hand, and only when the hard carbon starts to tighten
the hole, do I get out the drill. And then it's gentle gentle.......
Cheers,
Phill.
----- Original Message -----
From: "Barrie Purslow" <bpduo@xxxxxxxxxxxxx>
To: "Model Engineering List" <modeleng@xxxxxxxxxxxxx>
Sent: Monday, September 12, 2005 7:20 PM
Subject: [modeleng] Boiler blues
> I am restoring a 5" Duchess the boiler of which is in generally good
condition. However the flue tubes, which are about 15/16 ins. I.D., are
coated internally with a layer of hard, black carbon. I have given it the
usual flue brush treatment which produced clouds of black dust but a hard
layer about 1/64 ins. thick remains.
> I have tried fitting the flue brush into an electric drill and giving the
tubes a few minutes of rotary action to little effect. I am wary about
trying anything more aggressive as I have heard quotes of over £2000 for a
replacement boiler.
> Any ideas anyone?
> Barrie Purslow
> Warrington UK
> MODEL ENGINEERING DISCUSSION LIST.
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