Boiler pressures 3.1/2 gauge Pacifica

Hello. Can anyone tell me the working boiler pressures of LBSC's PAMELA, and HEILAN LASSIE?. I have one boiler from each to get tested! Many thanks

I thought this would be easy to find out as I just happen to be looking through some 1946 MEs - but no.

There is no mention of pressure rating in either the original introduction to the loco in issue 2333 (Jan24) or the start of the boiler build in issue 2372 (Oct 24).

So far the only reference I can find is in 2379 (Dec 12) where he talks about an alternative boiler shell. In this he comments that ".. a 16-gauge seamless copper tube will stand 80lb working pressure .. ". Since he originally specified 13-gauge (3/32-in.) then I assume that it would be safe to assume the original rating was at least 80psi.

Chris

Hi John,

Both are 80psi. LBSC mentions testing the boilers to 160psi in the final part on construction of the boilers. I think the majority of his boilers were 80psi WP.

John

Thanks Chris and John. That's exactly what I needed.

From LBSCs ME2291 Petrolea build April 1945

With the long extension handle on the
pump lever, a high pressure (far higher than
needed) is easily obtainable. A few strokes
should send the needle of the gauge around
to, say 80 lb., and the boiler should then be
examined to see if any leaks or bulges have
made their appearance. If all O.K., go up to
100 lb. and take another look. If still “ all
sereny,” go to 120, 140, and ¿nally 160 1b.,
which is twice the working pressure, and a
perfectly satisfactory test. It is merely folly
to go to an excessive pressure, for this puts
an unnecessary strain on the boiler. If the
boiler is tight and undistorted at 160 lb.
after being left awhile, it is a sound job, and