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| Southworth Engines Boiler Feed Pump |
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| Bogstandard:
A gang of us (3 actually) gathered in my little shop last night and put this little baby thru it's paces. First off, I personally couldn't believe how little pressure it required to run. We had it choked down to what we summised as about 2 PSI and it gently nodded away doing it's own thing. Restarting, even from this very low pressure, it didn't miss one beat, stop it, put tiny pressure to it again, and away it went, just as though it had never stopped. One of our mottley crew then brought up the question. This is basically a single cylinder double acting engine, and when used in the context of powering a model as an engine, single cylinder engines are usually shyed away from, purely because once stopped, they are very fickle as to whether they can restart again just by applying pressure. The valving arrangement on this engine seems to have solved this age old problem. That definitely requires a good dose looking at. As far as I can see only one problem exists, you would have no control which way the crank would turn as you restarted. But anyway, back to this pump. General consensus all round. A fantastic little unit that does what it was intended to do absolutely perfectly. Very nicely made Stew. :bow: :bow: :clap: :clap: Bogs |
| lordedmond:
Stew Whats it like when its working against a head ,after all that what it is a boiler feed pump as you know it should be able to pump to a higher pressure that that it is fed with Stuart |
| sbwhart:
The gang of three did shake out one small fault:- an air leak arround the steam chest, Johns leak detector (cigaret) traced a number of leak that we fixed by shortening screws that were bottoming out, a bit of Hylomar fixed others but one persisted, that was eventually traced to the little o ring arround the valve rod, the pocket cut into the steam chest for it, was way too small for the ring which was holding off the bottom cover, so this morning I cut the pocket bigger, and made some PTfE gaskets from material that John gave me, this seems to have solved the problem, its now running even better and the pump also seems to be bedding in nicely. Stuart I tried elevating the out pipe this morning to give it a head to work against it managed a 10" head no problem, that was the length of the pipe, putting my finger over the pipe, stopped the flow but there was a considerable pressure their, the pump kept on working, and the coupling joints started to leak. Hope this helps Stew |
| lordedmond:
Stew thanks for the info with 80 psi steam it should do at least 95psi on the water side I have seen the LBSC type running ( the one with the two rockers on top ) they do chuff well when under load they sound nice in the station with the exhaust up the lum under load Stuart |
| sbwhart:
--- Quote from: lordedmond on April 23, 2011, 05:15:56 AM --- I have seen the LBSC type running ( the one with the two rockers on top ) they do chuff well when under load they sound nice in the station with the exhaust up the lum under load Stuart --- End quote --- Just dug out my copy of "shop, shed and road" is that the pump LBSC calls Duplex Double Acting Feed Pump ?. Looks a very interesting design, you can't help but admire the man. Stew |
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