Search found 920 matches

by barts
Tue Feb 23, 2021 5:13 pm
Forum: Technical - Engines and Boilers
Topic: Tube square footage
Replies: 12
Views: 319

Re: Tube square footage

In Pennsylvania they sell a 212cc 6 horsepower OHV Gasoline engine at $99 on sale. I have bought a few over the years, and they have always performed very well. Small steam plants, perhaps similar to the Meryweather portables of about 100 years ago, would only be practical in a place with no hydroc...
by barts
Mon Feb 22, 2021 5:08 pm
Forum: Technical - Engines and Boilers
Topic: Tube square footage
Replies: 12
Views: 319

Re: Tube square footage

The cyclone "boiler" is a monotube steam generator - a rather different beast than a watertube boiler. I'd stay away from rotary vane motors unless someone with a big boiler and a bigger fuel budget is supplying the steam. Note that lubrication of the vanes is important at higher rpm due to centrifu...
by barts
Thu Feb 18, 2021 9:58 pm
Forum: Technical - Engines and Boilers
Topic: Hit n miss?
Replies: 4
Views: 160

Re: Hit n miss?

You should find a total displacement of 2000 (people, boat, engine, etc) lbs to be about right; the longer the boat at that weight, the faster it will go. Consult Skene's Elements of Yacht Design or Propeller Handbook (Gerr) for all sorts of useful formulas. Rule of thumb is 1 to 3 hp per ton of dis...
by barts
Thu Feb 18, 2021 4:09 am
Forum: Technical - Engines and Boilers
Topic: Tube square footage
Replies: 12
Views: 319

Re: Tube square footage

I've been searching for an older post concerning the "Thumb Rule" for piping/tubing square feet per desired HP with no luck. Wondered if someone could post info here or post the link to the thread ? A couple things I don't recall being pointed out in the thread discussion: 1. Does material thermal ...
by barts
Tue Feb 16, 2021 6:28 pm
Forum: Technical - Engines and Boilers
Topic: Theory question: Pressure/temperature limits
Replies: 20
Views: 562

Re: Theory question: Pressure/temperature limits

I am still amazed by the occurrence. There was a massive metal fire on a scrap yard in the port of a city I lived in in the past and half the city was carpeted with "poker room thick" smoke. It was advised to shut the windows and not to run around outside. (If you ever got welding fever, you know m...
by barts
Sat Feb 13, 2021 6:04 pm
Forum: Technical - Engines and Boilers
Topic: Theory question: Pressure/temperature limits
Replies: 20
Views: 562

Re: Theory question: Pressure/temperature limits

Yes, for the boiler tubes to have burned, they must have gotten meltingly hot so to speak. I've burned steel like that in my forge when I began forging, but the metal must already be glowing almost white. That shouldn't be possible in a boiler, even if the tubes are empty. But if they reached red h...
by barts
Sat Feb 13, 2021 1:52 am
Forum: Technical - Engines and Boilers
Topic: Theory question: Pressure/temperature limits
Replies: 20
Views: 562

Re: Theory question: Pressure/temperature limits

Reading the complete report is quite interesting; the detailed descriptions of various problems encountered both in initial development and in maintenance are particularly useful. One mechanism they describe for oil removal from condensate is the use of stainless steel disks slowly rotating at 10 rp...
by barts
Thu Feb 11, 2021 8:34 pm
Forum: Technical - Engines and Boilers
Topic: Theory question: Pressure/temperature limits
Replies: 20
Views: 562

Re: Theory question: Pressure/temperature limits

I really prefer a steam plant in a boat that is quiet and doesn't require exotic materials. In the end, steamboating largely is a hobby activity, much like sailing. I've ridden in a boat with a steam outboard running at 800F and 800 psi - pretty amazing engineering, but not really the sort of boat o...
by barts
Thu Feb 11, 2021 6:44 pm
Forum: Technical - Engines and Boilers
Topic: Theory question: Pressure/temperature limits
Replies: 20
Views: 562

Re: Theory question: Pressure/temperature limits

High temperature boilers have some interesting issues; a British text "Marine Steam Boilers" on my shelf has pictures of a water tube boiler ('of Continental design' :roll: ) that suffered a superheater fire that spread to the rest of the tubes; apparently a superheater tube overheated badly ( 1200F...