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Steel boilers

whwr

Joined: 1-01-70

Topics: 3

Replies: 1

Posted: Wed 10th Feb 2010, 6:55pm
Steel boilers

Hello. I have a new steel boiler for a Romulus. Is it acceptable to drill and tap through the backhead (c. 6-8 mm plate) for watergauge fittings, regulator bush pad, firehole door hinge etc? Or, are pads required to be welded on to allow blind holes (well, not for the water gauges!) or to allow a greater depth of thread. Any guidance would be much appreciated. Thank you.
 

Replies To This Post

bruce morgans

Joined: 21-01-05

Topics: 6

Replies: 18

Posted: Tue 16th Feb 2010, 10:55am

Hi I was in the same situation a few years ago when I was building my Romulus. I had a new steel boiler and had to drill the backhead for the gauge gl***** and regulator bush and the smokebox tube plate for the wet steam header. I had the hinge for the firehole door welded on when I collected the boiler so this was not a problem for me. I found it easier to make up some simple jigs to ensure the holes I drilled and the threads I cut were perpendicular to the metal and in the correct place. There is no need to have any pads welded on. Before the loco was steamed a repeat hydraulic test was carried out by the club so I was pleased that the work I had done was sound.
 

peterbeevers

Joined: 9-10-01

Topics: 3

Replies: 134

Posted: Tue 16th Feb 2010, 11:04am

The important thing here is what your boiler inspector is happy with - so I'd suggest you have a word with him.
 

WembleyLion

Joined: 1-01-87

Topics: 2

Replies: 34

Posted: Wed 17th Feb 2010, 10:03pm

A question for Tony Wood(Walker Midgley), our boiler committee or a professional boiler maker/inspector.

If a boiler is CE marked I presume that it has been inspected and deemed satisfactory 'at the time of marking'. If at a later date modifications to the structure of the boiler are made, ie drilling holes, welding on mountings, etc, by someone other than the builder, will this invalidate the CE Approval?
If after such modification the CE Approval is invalidated will the boiler have to be inspected again for compliance with the CE Approval regulations?
What is the situation regarding repairs and re-tubing of a CE marked steel boilers; can this work be carried out by non CE Approved persons?

WHWR
I think I would be inclined to return the boiler to the person who made it and ask him to make the necessary modifications or at least check with him that what you are intending to do is OK. It probably won't cost much if he does the job for you and it may just save you a lot of h*****le later on with testing/insurance etc.

John 1255
 

whwr

Joined: 1-01-70

Topics: 3

Replies: 1

Posted: Fri 19th Feb 2010, 7:52am

Thank you all very much indeed for your comments. I appreciate it.
 

bruce morgans

Joined: 21-01-05

Topics: 6

Replies: 18

Posted: Fri 19th Feb 2010, 7:29pm

Further to my original comments. Firstly I *****ume your boiler was commercially made by a reputable boiler maker and came with all the required documentation. All the comments that have been made are valid but there has to be a point were common sense kicks in, or is this an old fashioned phrase that no longer applies. To drill a couple of small holes for a gauge gl***** will not render a perfectly good boiler an 'explosive risk'. This does not constitute a structual change. As in my case the completed boiler was subjected to a final hydraulic at 'Club' level before it was steamed. By the way the drawing for the Romulus steel boiler does not show any pads for the gauge gl***** or regulator arrangements as the minimum thickness at these points is 6mm/1/4inch plate. If we had been talking about a copper boiler then pads/bushes would have been provided for these features as shown in the drawing for the copper boiler. I am sure there will be members that disagree with my logic.
 

peterbeevers

Joined: 9-10-01

Topics: 3

Replies: 134

Posted: Fri 19th Feb 2010, 7:47pm

I agree with Bruce - drilling and tapping a few holes (some of which you have to have - e.g. water gauge(s)) does not constitute rendering the boiler an 'explosive risk'. Indeed, if you do this as per the original drawings (to which the boiler was built) then you cannot possibly go wrong. And, in that case, there is no need to do another hydraulic test.
 

ianarnott

Joined: 1-01-70

Topics: 1

Replies: 3

Posted: Tue 23rd Feb 2010, 9:21pm

Whilst on the subject of steel boilers, does anyone recognise the serial number format : F 85 FE found on a 4" foster traction engine boiler, and need to know the maker, as I wish to modify and use it for a 7 1/4 loco. the boiler is dated 1993. all stampings are on the top of the barrel above the firebox.
Many thanks, Ian.
 

Tim Martin

Joined: 1-01-70

Topics: 1

Replies: 10

Posted: Sat 27th Feb 2010, 8:10pm

I have clarified the position with my boiler builder (CE approved) Bruce is quite correct as long you are not altering the structure of the boiler you can drill holes for gauges fire hole door etc.even a separate bolt on inner dome does not count as part of the pressure vessel structure and can be altered as required.
 

brianlee

Joined: 1-01-92

Topics: 1

Replies: 14

Posted: Sat 23rd Aug 2014, 5:06pm

Rules for Examination and Testing of Miniature Steam Boilers.
For any member interested in the Examination and Testing of Miniature steam Boilers , they can study the rules at the Northern Association of Model Engineers website. The Rules are available as a PDF document which can be downloaded and then studied.The rules were prepared in consultation with the 7 1/4 G
Society and all the other leading organisations eg the Northern Assocoation of Model engineers, the Southern Federation , the HSE, Midland Federation and the Insurance Comapanies/ Agents
 
 
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