Would this classify as a new design?

[darrene]

This came up in a chat recently and I'd be interested to get some opinions.

What's the situation if an LBSC designed loco were built with a tested boiler designed for a different LBSC loco installed?

This doesn't classify as a new design from a boiler perspective does it? The 'design' hasn't changed, just the installation of said design.

Is that the case?

[houstonceng]

That’s the same as adding wheels abs other parts to a Simlex to make it look like a GWR 4-6-2.

[coniston]

Apr 4, 2021 13:26:36 GMT darrene said:

This came up in a chat recently and I'd be interested to get some opinions.

What's the situation if an LBSC designed loco were built with a tested boiler designed for a different LBSC loco installed?

This doesn't classify as a new design from a boiler perspective does it? The 'design' hasn't changed, just the installation of said design.

Is that the case?

It doesn't matter what boiler you fit to the chassis as long as the boiler has been made to the published / approved design for that boiler, you could fit it to a car chassis for all you like. Like all these things your first port of call should be your club BI.

Chris D

[runner42]

Your words just the installation of the said design is the only point to consider that could impact the safe operation of the boiler and I have been struggling to think of possible changes. Assuming that the items attached to the boiler have been modified and say the effectiveness of the blower is reduced so that the accumulation test parameters are altered, i.e the safety valves have not been subject to the same steam pressure rise that would have occurred had the blower not been altered. Or perhaps the installation prevents the fire being dropped in an emergency or blowdown valves not being accessible, or the boiler is held rigidly in the frames that prevents boiler expansion to occur. It is possibly drawing a long bow for these issues to occur in practice, but the BI as Chris has said is the person to give the OK to any design change.

Brian  

[darrene]

Thanks very much Andy, Chris and Brian