Boiler Design – issue 4765

[lezsmith]

On lezsmith Said:

 

This thread is however specific to small stainless-steel boilers.

 

Have to disagree with you there.

Your article and subsequent discussions relate to COPPER boilers. The thread has only recentyl drifted towards Stainless.

 

Well hopefully your small Stainless boiler will be OK now that you have now been told the correct grade of Stainless to use. Strength does not just come from the material but also use of the correct weld design & prep, welding methods as well as sound design.

[JasonBModerator @jasonb]

Oh and your Case is to a redesign by JULIUS De Wall not Julian. A man known for shall we say “inventive” boiler design.

may help others find the design if they know the correct designer.

[Paul KempParticipant @paulkemp46892]

Lez,  I thought this was getting silly as this “thread” is about copper boilers and the YPM article first raised by the OP some 10 pages ago.  Jason beat me to it with the same impression it seems.  It also wasn’t clear to me from my quick read of your post we had jumped to <3 bar litres.  I did follow your link but it didn’t take me to part 2 of the code so I went to part 1 which doesn’t have a 3.18, maybe I should have realised then!  No problem moving the discussion to steel or stainless piddlers (less than 3 bar litres) but that would merit a new thread altogether in my opinion.

Without wishing to encourage this discussion in this thread, from my knowledge of inspectors in the club I am a member of I would speculate they would not be terribly receptive to testing your boiler in the circumstances you describe.  There are certain reservations among them on Vol 2 of the code and at the very least I imagine they would still require material certs and welder competence evidence for a stainless example as well as checking it was in compliance with a published design and requiring a pressure gauge to be fitted.  As you know club level inspectors (as commercial ones for that matter) are not obligated to test any boiler and can simply decline to conduct an inspection and test.  The “federation” are perfectly at liberty to comment on the possible under their code but they are unable to guarantee that if you present your boiler to a member club their inspector(s) will test it.

Paul.

[JasonBModerator @jasonb]

Paul, just to make it clear for anyone who may still be following along. Part 2 does not allow for any boilers with steel or stainless steel to be tested under that part of the code. So your inspectors would be right in not testing a small stainless boiler. Part 2 does allow brass though, can’t have those Mamods with out a cert!!.

I would think that Les’s boiler would fall in the 3 to 500 bar litre range so again if in stainless would not be accepted for TESTING under the CLUB code Part 1 either. Don’t know why he went looking at part 2.

 

[lezsmithParticipant @lezsmith]

Hi Paul & Jason,

FYI the Traction engine was not designed by Julius De Wall, he simply converted the original design by Rudy Kouhoupt to Metric, his plans are freely available at https://modelengineeringwebsite.com/Julian_TE_2.html. (please note their are some issues with the conversion I have sent a list of the issues to Julius).

Julius De Wall named the traction engine “Julian” hence I refer to is as the Julian traction engine.

Peter Squire (Sectary of FMES) has put me InTouch with their safety officer and Boiler inspector so I can get my UK regulations and insurance questions answered.

Jason is correct, my boiler is 6.15 Bar-litre, sorry my link was to part 1 by mistake, however as Jason points out the SS limitations are the same.

Both Paul and Jason, are correct about this thread being about Copper boilers, therefore we should drop any further references to Steel or Stainless Steel.

[JasonBModerator @jasonb]

Les, as I said “your Case is to a redesign by JULIUS” no need to inform me of it’s origin.

Also not just a simple conversion to metric. He doubled it up, and rounded the numbers to the nearest whole mm in many cases both rounding up and rounding down.

Yes lets leave this Traction engine to another thread if you wish to start one.

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