Yorkshire Steam Wagon Drawings ???

[JasonBModerator @jasonb]

The CAD drawings will be nothing like the original full size drawings Darren is working from, plenty of other sets of drawing for models taken from other original works drawings over the years and the person drawing them has the copy right. Grey area if Darren were redrawing a set of 4" drawings in CAD but he is not.

[HopperParticipant @hopper]

Yes it's an interesting anomaly in IP law and its application over the years.

[John WightParticipant @johnwight23439]

The Haining dredger boiler was featured in ME some years ago, I will see if I can find it again in the database. Unfortunately with the lock down I do not have access to our club archive but may be able to find it otherwise.

A comment on steel boilers. I am a club boiler tester and the NAME and other model engineering societies have revised the test code to mandate that steel boilers must have the cladding removed every 7 years for inspection. This does not apply to commercial testing. Also as you probably know a steel boiler must be welded by a welder certified for pressure vessels and have all design calculations verified by an independent expert before it can be tested and certified. Personally I would build in copper but that is the builder's choice.

John

[Darren ConwayParticipant @darrenconway28179]

Hi

I am a professional engineer and I have spent time punching sprays at the face of full sized marine boilers. It is rare to find pressured copper boilers outside of model engineering. I am not saying copper should not be used. I am saying that I would prefer not to use copper.

As previously stated, I haven't yet figured out how to make the boiler. No options are ruled out.

Dazz

[JasonBModerator @jasonb]

Previous post removed.

The Suffolk boiler is not a return tube one, just has three cross tubes to simplify things though no way to get to the tubes should they ever need replacing and not a lot of heating area.

Edited By JasonB on 04/06/2020 10:26:00

[John WightParticipant @johnwight23439]

Darren

Fair point, I have also spent a lot of years working on full size boilers, in my case standard gauge steam locomotive ones, and agree entirely with what you say regarding anything bigger than 4" scale.

John

[Mark EasingwoodParticipant @markeasingwood33578]

Whilst I was looking at something else on ebay, I came upon this book, if it's of interest to anyone.

** Yorkshire Patent Steam Wagon **

[Paul KempParticipant @paulkemp46892]

Posted by John Wight on 04/06/2020 09:09:19:

The Haining dredger boiler was featured in ME some years ago, I will see if I can find it again in the database. Unfortunately with the lock down I do not have access to our club archive but may be able to find it otherwise.

A comment on steel boilers. I am a club boiler tester and the NAME and other model engineering societies have revised the test code to mandate that steel boilers must have the cladding removed every 7 years for inspection. This does not apply to commercial testing. Also as you probably know a steel boiler must be welded by a welder certified for pressure vessels and have all design calculations verified by an independent expert before it can be tested and certified. Personally I would build in copper but that is the builder's choice.

John

John,

As Darren is in New Zealand I very much doubt the UK code would be recognised. Closest geographically would be the Australian (which is more onerous than ours in limiting WP of steel boilers). As to design verification under 'our' code the boiler inspector approval is sufficient if the builder can present his own evidence.

Quoting the 2018 version of the code in section 5, Design Verification; "The constructor of a boiler to other than a recognised design available through the model engineering trade and/or press shall produce design drawings and demonstrate to the satisfaction of the Inspector, either by calculation or by well-proven example, that the design and materials used have adequate strength."

If the inspector cannot be satisfied by assessing the builder's calculations and requires an independent expert approval then surely the inspector is outside his competence to test that particular boiler as defined elsewhere in the code?

The 7 year cladding removal for steel boilers may be extended to 10 years at the discretion of the inspector with a justification noted on the certificate (which is in line with commercial practice and in my opinion perfectly sensible).

Paul.

[Darren ConwayParticipant @darrenconway28179]

Posted by Mark Easingwood on 04/06/2020 21:43:31:

Whilst I was looking at something else on ebay, I came upon this book, if it's of interest to anyone.

** Yorkshire Patent Steam Wagon **

I'd like to bid but the seller doesn't post international and e-bay blocks attempts to contact him to ask if he would make an exception. Very frustrating.

Dazz

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