[Steam-engine] Fusible plug

[Andy glines]

It is an old square plug from an old engine.  1905
Huber return flue.  The fusible plug screws into to
top of the fireflue.  Probably 1"
--- Bruce & Marlene Babcock <babcock2 at gte.net> wrote:

> Andy,
> 
>     ASME fusible plugs have standard NPT pipe
> threads.
> 
>     I suggest that you simply take a 3/4-inch and a
> 1-inch pipe coupling and
> see which one the plug fits.  If you have a vertical
> boiler with a
> water-side plug or if your boiler is small, you may
> have a 1/2-inch plug.
> 
>     Not all old fusible plugs had standard NPT pipe
> threads.  I have seen at
> least one old, square-headed plug with unusual
> threads.
> 
>     If your plug is a marine plug it may have
> standard NPT threads except
> that the length of the threads may be greater and
> the larger diameter
> bigger.  This was done because the Federal
> Government specified, and
> enforced, the frequent replacement of marine fusible
> plugs.   These special
> plugs would fit holes that had become stretched out
> from frequent
> replacement of the plugs.   If the hole in your
> crown sheet is not stretched
> out you will not need to replace you plug with a
> special marine plug.  You
> probably could not find one.  They have not been
> manufactured for many
> years.
> 
> Sincerely,
> 
> Bruce E. Babcock
> 
> 
> 
> ----- Original Message ----- 
> From: "Andy glines" <pioneersop96 at yahoo.com>
> To: "Steam"
> <steam-engine at lists.stationary-engine.com>
> Sent: Monday, September 20, 2004 1:29 PM
> Subject: [Steam-engine] Fusible plug
> 
> 
> > I finally got the plug out of my engine and need
> to
> > know how I determine its size.  Where do I measure
> to
> > find out what size of plug my boiler uses?  Are
> there
> > special fusible plug threads?  These don't really
> look
> > like pipe threads to me.
> >
> > =====
> > Andy Glines
> > Evansville, IN
> >
> >
> >
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=====
Andy Glines
Evansville, IN


		
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