[modeleng] Re: Copper boilers
- From: The Sheppard Residence <peter@xxxxxxxxxxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Wed, 01 Dec 2004 18:36:12 +0000
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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>
> --------------------------------------------------------------------
>
>>Peter Sheppard BSc (Hons) CEng FIEE FIRSE FSaRS
>>Principal Consultant
>>Lloyd's Register Rail Limited
>>5th Floor, 37-39 Corn Street
>>Bristol BS1 1HT
>>
>>T: 0117 929 4443
>>F: 0117 929 4554
>>M: 07760 167 617
>>E: peter.sheppard@xxxxxxxxxx
>>
>
> --------------------------------------------------------------------
>
>>
>>-----Original Message-----
>>From: R.L. Roebuck [SMTP:rlr20@xxxxxxxxxxxxx]
>>Sent: Wednesday, December 01, 2004 2:26 PM
>>To: modeleng@xxxxxxxxxxxxx
>>Subject: [modeleng] Re: Copper boilers
>>
>>
>>MODEL ENGINEERING DISCUSSION LIST.
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