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Triple Expansion Engine - Elliott Bay

Posted: Sat Dec 05, 2009 1:25 pm
by Maltelec
Here is a reproduction of the Elliot Bay engine topic from the old forum:

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Re: Triple Expansion Engine - Elliott Bay

Posted: Sat Dec 05, 2009 1:25 pm
by Maltelec
More pictures of the part-machined bearings and the engine bed

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Re: Triple Expansion Engine - Elliott Bay

Posted: Sat Dec 05, 2009 1:25 pm
by kno3
What is this engine for and what boiler is it going to have?

Re: Triple Expansion Engine - Elliott Bay

Posted: Sat Dec 05, 2009 1:26 pm
by Edward
It's for a 32' steam launch currently being fitted out. I hope the boiler will be a vertical firetube wet firebox with 141 x 3/4" id tubes, grate area 3.142 sq ft.

Re: Triple Expansion Engine - Elliott Bay

Posted: Sat Dec 05, 2009 1:27 pm
by Edward
It ocurred to me that the estimated steam consumption figures for this triple might be of interest. As a general rule of thumb triples need a steam pressure of 150+psi; of course a lot depends on the ratios between the volumes of the cylinders and also the vacuum in the condenser.
The cylinder dimensions are 2 3/4"+ 4 3/8"+6 1/2" x 4".
Estimated steam consumption is as follows:
At 180psi , 500rpm=254 lbs per hour, 250rpm=127 lbs per hour.
At 200psi , 500rpm=275 lbs per hour, 250rpm=138 lbs per hour.
I hope these figures are of interest. If anyone can spot any flaws I'd be grateful to receive their views.

Re: Triple Expansion Engine - Elliott Bay

Posted: Sat Dec 05, 2009 1:27 pm
by Maltelec
Here is a picture of the columns polished and ready to go on the bed plate

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Re: Triple Expansion Engine - Elliott Bay

Posted: Sat Dec 05, 2009 1:27 pm
by Edward
I bet your mother was deliriously happy ( or should that be hysterical ) to have them in her kitchen.

Re: Triple Expansion Engine - Elliott Bay

Posted: Sat Dec 05, 2009 1:28 pm
by Maltelec
I recon she is used to it by now

I've got a video and another picture



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Re: Triple Expansion Engine - Elliott Bay

Posted: Sat Dec 05, 2009 1:30 pm
by Maltelec
2 more pictures from today:

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Re: Triple Expansion Engine - Elliott Bay

Posted: Sat Dec 05, 2009 1:31 pm
by Maltelec
More pictures of the progress

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