Author Topic: A WATERTUBE BOILER FOR MY TRIPLE EXPANSION ENGINE  (Read 4535 times)

Offline simplyloco

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Re: A WATERTUBE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #60 on: February 07, 2024, 10:07:32 AM »
Hi John, I like that location and the extra tube.

Thanks for re posting the drawing.  I guess it shows the feedwater heater is coming soon.

SNIP
Looking forward to the next episodes.

MJM460
Good morning!

I have to say I'm not sure about the feedwater heater as the Edwards pump will be supplying warm condensate from the spill tank. However... :LittleAngel:
John
Strong minds discuss ideas, average minds discuss events, weak minds discuss people.” ― Socrates

Offline Laurentic

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Re: A WATERTUBE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #61 on: February 07, 2024, 11:49:17 AM »
Nice work so far John - I have to say I would also go for a feedwater heater, it's easy to do now in the construction stage and will add to the system, every little helps, it 'balances' the boiler plus it's a bit more as per the design in the book,

Bon Chance
Chris

Offline simplyloco

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Re: A WATERTUBE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #62 on: February 07, 2024, 06:12:42 PM »
Boiler Housing.

Still waiting on the delivery of the water gauge, and I'll need some more tubing if I'm going to fit a water pre-heater (might as well do it right!) so I got on with the boiler housing. This was in between doing the shopping, arranging our Spain apartment rental, helping with the bedroom decorating, and preparing tonight's Chinese meal! How did I ever find time for work???
While I was out shopping I procured two pieces of 200 x 1000 mm x 0.5 mm galvanised steel from our local hardware store. This is the maximum thickness my Formit guillotine will handle.
Some pics.

Design Department Output.


Drilled with the sheet metal drill gadget.


First dressing at 45 deg angle. Looks OK!


Bending the sides, all done by eye. Absolute squareness is required on this job!


'Adjusting' the angles to obtain symmetry.


I'll make a frame from some alloy angle. I'll mount it on some insulating board: something I have yet to find!


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

Offline Dave Otto

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Re: A WATERTUBE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #63 on: February 07, 2024, 07:37:59 PM »
Looking good!

Dave

Offline Vixen

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Re: A WATERTUBE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #64 on: February 07, 2024, 07:47:52 PM »
Looks like the boiler is in the 'dog house' for some reason.

Very neat and tidy work. A pleasure to see.   :ThumbsUp: :ThumbsUp:

Cheers

Mike
It is the journey that matters, not the destination

Sometimes, it can be a long and winding road

Offline crueby

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Re: A WATERTUBE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #65 on: February 07, 2024, 07:52:20 PM »
How will you be firing it - coal, gas?

 :popcorn: :popcorn:

Offline Laurentic

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Re: A WATERTUBE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #66 on: February 07, 2024, 07:53:44 PM »
I concur with Mike. 

I particularly am impressed with the silver soldering, very nice, very neat, and very much beyond my abilities at present!

Chris

Offline simplyloco

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Re: A WATERTUBE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #67 on: February 07, 2024, 08:05:14 PM »
I concur with Mike. 

I particularly am impressed with the silver soldering, very nice, very neat, and very much beyond my abilities at present!

Chris

Thanks guys. I haven't tested it for leaks yet... O:-)
Chris: It will be fired by gas. Coal is FAR too messy!
John
Strong minds discuss ideas, average minds discuss events, weak minds discuss people.” ― Socrates

Offline MJM460

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Re: A WATERTUBE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #68 on: February 08, 2024, 11:26:56 AM »
Hi John, That casing looks very neat.  I assume you have allowed space over the top drum for insulation?  By the way, what material are you using for insulation?

I hope you have a good oil separator if you are planning using the condensate as feedwater.  It is pretty difficult to remove the oil and it tends to foul up the inside of the boiler.  I would suggest using clean water and not condensate.

I do hope you will include the feed water heater.  If you can spring for about 3 m of tube, I suspect you will use just a little under 2 for the feedwater heater and the other metre to replace the superheater, otherwise you will always worry about that join!  You can straighten the tube and use it to pipe up the whole system.  It won’t be wasted.

Remember the feedwater inlet should be at the bottom, and be a serpentine layout, not spiral, so it rises continually to the water outlet and into the boiler.  Some alternating horizontal and inclined coils will allow you to fit a few more passes where the casing is further away from the sloped tubes.

MJM460


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

Offline simplyloco

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Re: A WATERTUBE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #69 on: February 08, 2024, 04:23:43 PM »
Water Gauge

The water gauge arrived today, and what a sweet little thing it is! I bought it from John Rex Model Engineers at very sensible money, and it's nicer than any that I have made in the past. It's only 3/16"x40, just about the smallest I could find, and it fits in nicely.
However, the pressure gauge I found in a drawer has got a screw-in fitting, thus preventing easy removal with the gauge in place, so I will purchase a smaller 150psi one with a banjo fitting...!

I think I have found suitable insulation here. They are just around the corner!
https://www.heritagesteamsupplies.co.uk/foil-faced-single-sided-tc-superwool-6mm-x-610mm-x-1m.html


https://www.ebay.co.uk/itm/203209576914?var=503557497103



That pressure gauge is FAR too big!




I forgot to mention that I knocked out one of the end covers. It will need 'dressing' to get a better fit.

« Last Edit: February 08, 2024, 04:39:30 PM by simplyloco »
Strong minds discuss ideas, average minds discuss events, weak minds discuss people.” ― Socrates

Offline cnr6400

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Re: A WATERTUBE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #70 on: February 08, 2024, 04:35:17 PM »
 :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 WATERTUBE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #71 on: February 12, 2024, 04:25:36 PM »
New superheater, feedwater heater and the boiler is now soldered together but my shaky hands have been at play.... 😍

12mm pressure gauge is in the post...

I'm going to have to close up/elevate the feedwater heater and add a join. I ran out of tube!
Some pics.






« Last Edit: February 12, 2024, 04:36:31 PM by simplyloco »
Strong minds discuss ideas, average minds discuss events, weak minds discuss people.” ― Socrates

Offline RReid

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Re: A WATERTUBE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #72 on: February 12, 2024, 04:39:31 PM »
That is a most impressive boiler. Very well done! :ThumbsUp: :ThumbsUp: :popcorn:
Regards,
Ron

Offline cnr6400

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Re: A WATERTUBE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #73 on: February 12, 2024, 04:49:07 PM »
 :ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn:
"I've cut that stock three times, and it's still too short!"

Online Kim

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Re: A WATERTUBE BOILER FOR MY TRIPLE EXPANSION ENGINE
« Reply #74 on: February 12, 2024, 06:24:07 PM »
Wow!  That's really coming along!   You're boiler looks great!  :ThumbsUp: :popcorn: :popcorn:

Kim

 

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