A SCOTCH MARINE BOILER FOR MY TRIPLE EXPANSION ENGINE

[cnr6400]

 

[simplyloco]

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.

[crueby]

Its all turned out beautiful!   Enjoy your trip!

[Kim]

Your boiler is simply gorgeous!   

Have fun on your vacation!

Kim

[simplyloco]

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.

[Laurentic]

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

[simplyloco]

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...?

[MJM460]

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

[Laurentic]

Are, so, now I understand what you were saying!!!!

Chris