[modeleng] Re: Copper boilers
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Wed, 1 Dec 2004 14:43:35 -0800 (PST)
Safety valve!! Hey!! I'm glad you mentioned that!
I'll take it apart and install a new ball just as soon
as the hydro is over!
Al Messer
--- The Sheppard Residence <peter@xxxxxxxxxxxxxxxxxxx>
wrote:
> I assume that they are looking for "worst case",
> i.e. the most steam
> being raised (by whatever means) that is normal for
> that boiler.
>
> So if no blower and butane fired, I assume the
> largest fire that you
> could expect.
>
> As a corollary to the above (based on personal
> experience in my early
> days as a locomotive engineer!) after a winter
> lay-down, don't assume
> that the safety valves will work! Sometimes they
> need "encouraging"
> (sometimes even after a short a laydown as a couple
> of months!)
>
> What happened was that I made the mistake of
> steaming up, pressure
> rising nicely, out of the steaming bays onto the
> main line, pressure
> continuing to rise, past the 10% and rising! Drop
> the fire (on the main
> line) back to the steaming bays and remove the
> safety valves. (the
> stainless steel balls had corroded!)
>
> I now make sure that both safety valves have blown
> off in the steaming
> bays before I go anywhere.
>
> (I know it seems common sense, but there are times
> when you have to
> learn these lessons!)
>
> Cheers
>
> Peter
>
> Allen Messer wrote:
>
> > Peter, what if the boiler is a Water Tube Marine
> > design, that is Propane fired, and has no blower?
> > Would a "Full Blast Fire" situation on the burner
> > suffice?
> >
> > Al Messer
> > --- Peter Sheppard <peter.sheppard@xxxxxxxxxx>
> wrote:
> >
> >
> >>As far as I am aware in the UK, the following is
> >>required on copper boilers
> >>every two years (it may apply to steel boilers as
> >>well).
> >>
> >>1.5x hydraulic test; plus
> >>steam test to demonstrate that with a full blower
> >>the safety valves will
> >>maintain pressure at no greater than 10% above
> >>working pressure and at the
> >>same time look for significant steam leaks
> >>
> >>Cheers
> >>
> >>Peter
> >>
> >>
> >
> >
>
------------------------------------------------------------------------
> >
> >>
> >>
> >
> >
>
-----------------------------------------------------------
> >
> >>Hi there Al,
> >>
> >>One slight thing which you mentioned, which no-one
> >>seems to have commented
> >>on.
> >>
> >>Over here in the UK, we normally give steel
> boilers
> >>an annual test
> >>(correct me if I'm out of touch anyone), but
> copper
> >>boilers are only
> >>tested every two years, and I had been lead to
> >>believe that this was just
> >>the hydraulic test.
> >>
> >>I know that the initial hydraulic test is to twice
> >>working pressure -
> >>has someone mentioned before that some retests
> need
> >>only be to 1.5 times
> >>working pressure?
> >>
> >>Yours,
> >>
> >>
> >>Rich.
> >>
> >>
> >>On Wed, 1 Dec 2004, Allen Messer wrote:
> >>
> >>
> >>>Thanks for the input, Gents! I'll just have to
> >>
> >>whip
> >>
> >>>out a pump and give 'er a good test.
> >>>
> >>>Al Messer
> >>>--- alanjstepney
> >>
> >><alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
> >>
> >>>wrote:
> >>>
> >>>
> >>>>Yes.
> >>>>Over here it is a requirement of all the Model
> >>>>Engineering Societies and
> >>>>their insurers.
> >>>>Apart from that, they can deteriorate over time,
> >>
> >>and
> >>
> >>>>as a test is so quick
> >>>>and simple, it is better to test than not.
> >>>>
> >>>>alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> >>>>
> >>>>www.alanstepney.info
> >>>>Model Engineering, Steam Engine, and Railway
> >>>>technical pages.
> >>>>
> >>>>----- Original Message -----
> >>>>From: "Allen Messer" <al_messer@xxxxxxxxx>
> >>>>To: "modeleng" <modeleng@xxxxxxxxxxxxx>
> >>>>Sent: Wednesday, December 01, 2004 1:44 AM
> >>>>Subject: [modeleng] Copper boilers
> >>>>
> >>>>
> >>>>Since it is assumed that model boilers made from
> >>>>Copper are not affected by corrosion as are
> >>
> >>those
> >>
> >>>>made
> >>>>of Steel, is it necessary to give them an annual
> >>>>hydro
> >>>>and steam test?
> >>>>
> >>>>Al Messer
> >>>>
> >>>>
> >>>>
> >>>>
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> >>>
> >>>
> >>>
> >>>
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