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Brass or Bronze for boiler fittings

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AdrianR11/04/2020 14:48:33
540 forum posts
36 photos

Hi,

I am making Myfordsboy's 2.5" boiler. On the drawings is says use brass for the bushes. On the video he says use bronze.

I am also thinking of making all the other fittings from brass.

How much of an issue is it to use brass instead of bronze for boiler fittings, considering this will only be fired a few times.

Thanks

Adrian

Former Member11/04/2020 14:55:00
1329 forum posts

[This posting has been removed]

Nigel Bennett11/04/2020 14:55:39
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414 forum posts
11 photos

I would never use brass in a boiler. I've had brass fittings dezincify and snap off! You say it will only be fired a few times, but what happens after you've gone and somebody else starts to use it?

Cost isn't really that different; it's just a bit more difficult to machine, so I would sternly advise bronze.

As a boiler inspector, I would refuse to certify a boiler with brass bushes in it.

AdrianR11/04/2020 15:07:57
540 forum posts
36 photos

Hmm, that is what I thought.

So from my usual suppliers I have a choice, Colphos 90, PB 102, SAE660

Which would be the best to use?

Adrian

Former Member11/04/2020 15:17:30
1329 forum posts

[This posting has been removed]

alan herrington12/04/2020 09:31:52
1 forum posts

PB102 is best. As i recollect Colphos 90 is easier to work due to it having a lead content (all be it very low %) however if it is overheated when silver soldering or brazing the lead can attempt to escape!

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