Author Topic: A SCOTCH MARINE BOILER FOR MY TRIPLE EXPANSION ENGINE  (Read 3565 times)

Offline cnr6400

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Re: A SCOTCH MARINE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #45 on: March 01, 2024, 12:25:58 AM »
 :ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn:
"I've cut that stock three times, and it's still too short!"

Offline simplyloco

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Re: A SCOTCH MARINE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #46 on: March 02, 2024, 05:25:40 PM »
Pressure gauge and globe valves received, so it's ready and waiting for the Triple! Apart from a little soldering that is...

We are off to Spain in ten days time: we've rented an apartment in L'Albir, north of Benidorm, and we won't be back until mid May, so the Triple will have to wait. Goodness I need a break from this damned workshop!😱😇

Some pics.
Strong minds discuss ideas, average minds discuss events, weak minds discuss people.” ― Socrates

Offline crueby

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Re: A SCOTCH MARINE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #47 on: March 02, 2024, 07:24:49 PM »
Its all turned out beautiful!   Enjoy your trip!

Online Kim

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Re: A SCOTCH MARINE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #48 on: March 02, 2024, 10:10:06 PM »
Your boiler is simply gorgeous!   :ThumbsUp: :popcorn:

Have fun on your vacation!

Kim

Offline simplyloco

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Re: A SCOTCH MARINE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #49 on: March 08, 2024, 12:33:59 PM »
Testing for fittings and level of superheat. I haven't gone on holiday yet...😍

The boiler shell test is one thing, but they often leak at the fittings connections. This one was no exception, as one of the banjos wasn't seating squarely on the bush. The boiler now holds 75psi quite happily on the small propane burner and the safety valve works OK. Steam at this pressure is at a temperature of around 160 degrees C. Quite hot! However, once it is superheated...

Steam exit temperature was 274C settling to 217C after going through the double coil superheater. That's pretty dry steam! However, to sustain the output at this temperature I'll probably have to use the big burner and a very good boiler feed pump!
Well pleased.


« Last Edit: March 08, 2024, 03:02:49 PM by simplyloco »
Strong minds discuss ideas, average minds discuss events, weak minds discuss people.” ― Socrates

Offline Laurentic

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Re: A SCOTCH MARINE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #50 on: March 08, 2024, 03:50:05 PM »
The way that reads, the superheater took nearly 60 degC out of the steam - not sure its supposed to work like that!!  It never used to!!

Chris

Offline simplyloco

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Re: A SCOTCH MARINE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #51 on: March 08, 2024, 03:59:33 PM »
The way that reads, the superheater took nearly 60 degC out of the steam - not sure its supposed to work like that!!  It never used to!!

Chris

Let me explain. When I first opened the steam valve the initial rush of steam was at 274C. Not surprising given the temp in the end space and no movement of steam. Then the constant stream was at the lower temperature, which was to be expected. Still 60 degrees above the wet steam temp so I read that as OK. Or am I being a numpty...? :old:
Strong minds discuss ideas, average minds discuss events, weak minds discuss people.” ― Socrates

Offline MJM460

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Re: A SCOTCH MARINE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #52 on: March 09, 2024, 09:39:26 AM »
Hi John,
you are correct about the reason for the temperature dropping when the steam flow starts.

Of course, it is worth thinking about how to set a tiny flow to warm things up as the boiler heats, at the same time ensuring there is a small flow through the superheater to avoid that temperature extreme.  You don’t want to melt anything during warmup.

The scotch boiler looks great.

MJM460

The more I learn, the more I find that I still have to learn!

Offline Laurentic

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Re: A SCOTCH MARINE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #53 on: March 09, 2024, 10:18:23 AM »
Are, so, now I understand what you were saying!!!!

Chris

 

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