[modeleng] Re: Boiler Certificates

Barrie,
Are you. I wasnt aware of that. Thanks
Alan Stepney

http://www.alanstepney.info
Model Engineering & steam engine information pages
----- Original Message ----- 
From: "Barrie Purslow" <bpduo@xxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Saturday, August 25, 2007 5:44 PM
Subject: [modeleng] Re: Boiler Certificates


Alan,

You are allowed a 10% rise in pressure above the working pressure during the
steam accumulation test

Barrie

----- Original Message ----- 
From: "Alan Stepney" <alan@xxxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Saturday, August 25, 2007 8:54 AM
Subject: [modeleng] Re: Boiler Certificates


> The first thing is a careful visual examination of the boiler.
> This will usually require removal of the insulation & cladding.
>
> Then, plug up all the outlets apart from two.
> Into one fit the Test Guage. This should be a certified gauge, not the
> little one fitted to the boiler.
> In the other, the pump.
> Fill with water, and by that I mean that it must be completely full, with
> no
> air spaces.
>
> Then pump us to test pressure. For the first test this is 2 x working
> pressure, for subsequent ttests, 1.5 x WP.
> Sit and 'ave a cuppa, whilst watching for drips, leaks, jets of water, or
> anything else that makes you want to tear your hair out.!
> If the pressure stays up, for at least 20 minutes (I believe the rules say
> 10 mins), then release some water, and uncouple the pump.
>
> Reconnect all the fittings that you uncoupled and blanked off for the
> hydraulic test.
> Check that there are two methods of feeding water into the boiler. (Might
> be
> a good idea to see if pumps work at this point.)
> Light a fire, and build it up as usual, watching the test pressure guage
> whilst so doing.
>
> At the working pressure, the safety valves should blow. If they do, they
> can
> then be locked at that setting, if not, adjust so that they do.
> Check the models pressure guage to see how accurate it is and what the
> reading is when at WP.
> (The model guage should be, or will need to be, marked with a red line at
> WP.)
>
> Check that injectors, if fitted, work.
>
> Then continue buildin the fire, and using the blower to see if you can
> manage to beat the safety valves and get the pressure to rise above WP.
> You should not be able to.
> The basis must be that no matter what you do, it is impossible to get the
> pressure to rise over the WP.
>
> (A lot of earlier designs fail at this point due to restricted outlets of
> the safety valves.)
>
> Assuming that it passes this OK, then that is it.
>
> Now, if you are taking your loco to a club to be tested, find out what
> fittings their pump and guage has, beforehand, and make adaptors to fit
> your
> engine.
> (My experience is that clubs stocks of adaptors evaporate, so the chance
> that the one you need will be there, is slim!)
>
>
>
>
> Alan Stepney
>
> http://www.alanstepney.info
> Model Engineering & steam engine information pages
> ----- Original Message ----- 
> From: "kenny.macdougall" <kenny.macdougall@xxxxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Saturday, August 25, 2007 8:04 AM
> Subject: [modeleng] Boiler Certificates
>
>
> Hi Alan
> What is invoved in testing a boiler on a 5 inch gauge loco /made of kent
> kenny
>
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