Search found 1569 matches

by fredrosse
Wed Apr 17, 2019 3:38 am
Forum: Technical - Engines and Boilers
Topic: British Rivet Manufacturers?
Replies: 9
Views: 189

Re: British Rivet Manufacturers?

marinesteam, thanks so much for the link to the rivet article. Captivating reading for me, as I was born too late for the era of riveted steam boilers. "pop" rivets are about the only real experience I have in this realm, and the skill level required for boiler riveting is orders of magnitude more t...
by fredrosse
Wed Apr 17, 2019 3:23 am
Forum: Technical - Engines and Boilers
Topic: Desuperheater question
Replies: 15
Views: 432

Re: Desuperheater question

Bart, I had exactly the same problem of vibration causing a leak in a copper economizer, the cause of one of the forced outages encountered during a four year run of the Domestic Heat-Power Module. Burning Anthracite coal, there is virtually no smoke, and no white plume during winter as there is no ...
by fredrosse
Sun Apr 14, 2019 3:21 am
Forum: Technical - Engines and Boilers
Topic: Desuperheater question
Replies: 15
Views: 432

Re: Desuperheater question

Adding a couple of points to Bart's list, needed to comply with the ASME Boiler and Pressure Vessel Code: No. 6 Boiler check valve, followed by an Isolation Valve If the economizer can be isolated and bypassed, then the economizer itself requires pressure relief protection because it then becomes a ...
by fredrosse
Tue Apr 09, 2019 12:57 am
Forum: Technical - Engines and Boilers
Topic: Desuperheater question
Replies: 15
Views: 432

Re: Desuperheater question

While it is good to make the best thermal arrangement, basically a counterflow heat exchange arrangement, this leads to serious difficulties of potential metal overheating, even with normal automatic controls, and a fire that can be completely controlled in a few seconds time. With wood firing, ther...
by fredrosse
Tue Apr 02, 2019 11:01 pm
Forum: Technical - Engines and Boilers
Topic: Opposed Piston Engine Project - The Steam Version
Replies: 35
Views: 1541

Re: Opposed Piston Engine Project - The Steam Version

"So if there is no advantage to this engine concept, why was the airplane engine, and many submarine engines made this way?" The only advantages I see is lower piston speed, the double crank engine has virtually half the piston speed compared to a single crank, and that represented a serious limitat...
by fredrosse
Mon Apr 01, 2019 11:30 am
Forum: Technical - Engines and Boilers
Topic: Opposed Piston Engine Project - The Steam Version
Replies: 35
Views: 1541

Re: Opposed Piston Engine Project - The Steam Version

" I need one of these crankcases for each end of the cylinder. And each of them is divided along the axis of the crankshafts to make it possible to insert the crankshaft. It is not an optimal solution to have ball bearings in a split bearing block, but I'll see how it gonna work." Why not make the m...
by fredrosse
Mon Apr 01, 2019 3:34 am
Forum: Technical - Engines and Boilers
Topic: Opposed Piston Engine Project - The Steam Version
Replies: 35
Views: 1541

Re: Opposed Piston Engine Project - The Steam Version

Lets say the engine with opposed pistons has two inch bore, and each crank has two inch stroke. With pistons at TDC there is only the clearance volume. At BDC each piston moves away from TDC two inches, thus engine displacement cylinder area x total four inches TDC to BDC = Pi X 4 = 12.56 cubic inch...
by fredrosse
Sun Mar 31, 2019 6:57 pm
Forum: Technical - Engines and Boilers
Topic: Opposed Piston Engine Project - The Steam Version
Replies: 35
Views: 1541

Re: Opposed Piston Engine Project - The Steam Version

"How do you anticipate dealing with condensation in the crankcase?" One of my closed crankcase single acting trunk steam engine used a chain saw lower end, fully enclosed. Where the reed valve was originally located I put a plate with two ball check valves, one into the crankcase, one out of the cra...
by fredrosse
Sun Mar 31, 2019 6:40 pm
Forum: Technical - Engines and Boilers
Topic: Opposed Piston Engine Project - The Steam Version
Replies: 35
Views: 1541

Re: Opposed Piston Engine Project - The Steam Version

"Will the steam not have to expand at twice the usual rate"

ANS: Not really, the piston(s) displacement, whatever it is, will still fully occur over 180 degrees of crank rotation, no different from a conventional engine running if at the same RPM as the one illustrated here.
by fredrosse
Fri Mar 29, 2019 3:22 am
Forum: Welcome
Topic: small steam engine?
Replies: 11
Views: 502

Re: small steam engine?

"I was guessing about the 5 hp, forgetting of course that steam hp is bigger (better?)." In real engineering, horsepower is horsepower, no matter steam or diesel or electric. It is however common for these numbers to be inflated by advertisements, etc. In any event, the FAQ section of this forum wil...