[modeleng] Re: Water gauge security
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Sun, 6 Aug 2006 10:50:32 -0700 (PDT)
I have successfully used Perm-a-tex non-hardening
gasket sealant on boiler fittings.
Al Messer
--- AndyA <AndyA@xxxxxxxx> wrote:
> Hi Ron
> I use one of the Loctite products, cant remember
> which one but it works a
> treat.
>
> Andy
> ----- Original Message -----
> From: "Ron Head" <ron.head@xxxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Saturday, August 05, 2006 9:44 PM
> Subject: [modeleng] Water gauge security
>
>
> Hi all
>
> A incident occurred at my club's track today, the
> outcome of which could
> have been very nasty. A new locomotive that had
> just been hydraulically
> tested was raising steam for the steam test. As
> full pressure was
> approached, the gauge glass started to weep and the
> owner decided to nip up
> the nuts with a spanner. Nothing wrong in that, but
> what happened next was
> most alarming.
>
> The water gauge on this particular loco follows a
> fairly conventional
> design, with top and bottom fittings screwed into
> threaded bushes in the
> boiler. The problem with this design, is to get both
> fittings pointing in
> the right direction so that the glass passes through
> without binding. The
> builder had achieved this by experimenting with
> copper washers of various
> thicknesses, until he was happy that the fittings
> were tightened up in the
> correct orientation.
>
> Now we all know that what is tight in a cold boiler,
> isn't necessarily tight
> in a hot boiler. When the owner tried to tighten
> the bottom nut, he
> succeeded in freeing off the bottom fitting so that
> it rotated and shattered
> the glass. The resulting spray of steam and hot
> water travelled backwards
> out of the cab for a distance of about six feet, and
> the owner was lucky to
> get his hand and face out of the way without being
> severely scalded.
>
> It occurs to me that no matter whether the top or
> bottom nut is tightened,
> the torque of the spanner will always try to unscrew
> the fitting. Has
> anyone else on this list had a similar problem and
> if so, what did you do to
> overcome it?
>
> Regards
> Ron Head
> City of Oxford SME
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