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Scotch boiler

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Jens Eirik Skogstad18/01/2014 08:02:39
367 forum posts
22 photos

Hi folks! laugh

Before i am planning to make a new boiler. There is 2 things i am looking for: Dry back Scotch boiler or wet back Scotch boiler.

I know the wet back Scotch boiler is better, but which of these boiler is practical and safe enough to use?

I am afraid if there is leakage in wet back Scotch boiler who make more difficult to repair.

Has someone here builded or owner a dry back or wet back Scotch boiler and can tell how practical and reliable the boiler can be in a lot of year?

Ady118/01/2014 09:28:15
3463 forum posts
513 photos

ME 3477 has an article on model scotch boilers, page 1122

The author recommends the dry-back version because any problems can be repaired after completion

Jens Eirik Skogstad18/01/2014 10:12:16
367 forum posts
22 photos

Ady1, i has not the ME 3477, not in the archive of magazines in here Model engineer web site. Can you send the scanned copy of the article on Scotch boiler to my PM?

Ady118/01/2014 10:48:34
3463 forum posts
513 photos

I've put a couple of jpgs in my album

Jens Eirik Skogstad18/01/2014 13:21:47
367 forum posts
22 photos

Ady1, thanks a lot!

Jens Eirik Skogstad19/01/2014 21:23:24
367 forum posts
22 photos

I has designed and calculated the Scotch boiler with dry back and got results:

100 mm diameter boiler with 50 mm furnace and 29 tubes of 8 mm flue tube, total length of boiler except smoke box in both sizes. The furnace is without calloway.

Heating surface: 1328,3 cm2

Total volume: 0,66 liter (not amount of water, boiler only)

Is it a good boiler and will it run a Stuart D10 in a tugboat? Ceramic burner or blowlampe is recommended to use in the boiler.?

I has Southworth waterpump to keep waterlevel in the boiler.

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