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| Tina :- Engine and Boiler Build |
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| klank:
Hi Stuart Just to clear up the issue of staying the firebox end of the boiler - I today spoke with GLR about it. GLR put me in touch with Peter Smith - he does all of the GLR boiler building, flangeing and fittings fabrication for those customers who wish to purchase the Tina boiler as a ready made item. He has built over 60 of them! He has edited/ added more up to date comments to the text originally contained in Stan Bray's article - these are shown in the current boiler build handbook as now supplied. He admits that the main plan supplied is that of the original mE 1950's boiler - which is somewhat out of date with current regulations. Anyway, as regards the need for stays, in all of the boilers he has built for GLR, no additional stays in the firebox have ever been fitted. He agrees that the fire tubes act as stays in the vertical plane but as the water space between the firebox and bottom of the barrel is so small, stays are not warranted. The boilers he has built have been tested to 250psi in hydraulic testing and steamed to 160 psi. with no problems. Although the "normal" working pressure suggested is 80psi, for "Tina" and similar slow revving engines, 40psi would be the normal maximum working pressure suggested. Interestingly, the weight blanced safety valve shown on the plan is now deemed "illegal" under current regulations and must not be used - although a dummy one could be fabricated. A "pop" safety valve is the correct way to go! I hope this explains the situation from GLR's perspective. Obviously there is nothing to stop one adding extra rivets in the firebox - as you say - for peace of mind, but they are not essential. Peter |
| lordedmond:
Thanks for the info Peter at least your mind is now at rest on the subject , But I wish that GLR would bring the plans up to date and get rid of that safety valve I am still in a quandary as to why they supplied the material for the stay in my kit , although I will fit them when I get round to the build May I ask you a favour As I have purchased the kit from GLR can I trouble you for a scan of Peter Smiths upto date comments email is in profile Stuart |
| klank:
Stuart - no problem I've got your pm and info will be sent shortly. Peter |
| madjackghengis:
Hi Peter, from the looks of the kit, you've got a very nice build ahead of you. The quality of the castings and the company show through, even in just photos, and I particularly like the look of bronze in engines of all sorts, but particularly in steam engines. I am very slowly working on a back burner steam engine, Ajax, from Tiny Power, and will be following this build very closely, as I expect there will be some to learn from it, particularly from the boiler part, as I plan to build one out of an old ET Westbury book, but have never built one before. Very nice start, and the discussion regarding the boiler is very informative, particularly the answers back from the company, with real numbers as to their own pressure testing standard. :beer: Cheers, Jack |
| lordedmond:
Thanks Peter for the amended notes Although I would take their boiler maker to task with his 250 psi hydro test when the boiler is specced up to be tested at 160 psi WP of 80 psi , to me that is placing unnecessary stress on the boiler and is not needed. thats 90 psi above the design calculations But as he is a boiler maker I will leave it at that Stuart |
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