steam4ian
Elder Statesman
One good turn deserves another
Posts: 2,069
|
Post by steam4ian on Dec 20, 2009 5:09:01 GMT
G'day John
On the SAR (Ozzie not Sarf Efricen) new boilers were tested to 1.5 times and at intervals and after repairs to 1.25 times. I know that in latter years when locos were only used for enthusiast specials they were tested to 1.25 times before they were steamed.
If the cladding was off then the joints were all hammered during the test, a "regulation" hammer was used.
Regards
Ian
|
|
jackrae
Elder Statesman
Posts: 1,335
|
Post by jackrae on Dec 20, 2009 11:52:10 GMT
Baggo
Think your friend wasn't seeing the full picture.
Consider working pressure is pressure at which engine runs and must therefore be less than relief pressure.
Relief pressure = working pressure + a bit (say 10%)
Accumulation pressure = relief pressure + the increase in prerssure that must result if the heat input is increased to maximum (fire blown at full rate)
In normal relief valve sizing, the relief orifice is designed such that accumulation is limited to 10% above relief pressure ie 121% of operating pressure.
Don't think I'd fancy being on the footplate with a boiler up front that was only guaranteed at working + 10psi
jack
|
|
|
|
Post by baggo on Dec 20, 2009 12:50:20 GMT
Quite possible Jack, that's only what he said after seeing the DVD. It does a bit unlikely. I'm hoping to borrow it myself soon so will be able to see for myself  John |
|
|
|
Post by alanstepney on Dec 20, 2009 16:56:28 GMT
Certainly some BR loco boilers only used to be tested to WP+10%.
(I say "some" as it may have varied between types or regions, I dont know.)
The salient point is that they were tested frequently, ( every two weeks for BR Std lcos.)
However, this is really off topic so if anyone wishes to discuss this, plese start a new thread and leave this one for the progress on that particular boiler.
|
|
|
|
Post by havoc on Dec 21, 2009 8:39:53 GMT
Right, but read the post again: they insist on the boiler under construction (a professionally made one) to be tested to 2x WP because a professionally made is only tested to 1.5x WP. This really is over the top. Safety testing isn't some number game where higher is better.
|
|
|
|
Post by drjohn on Dec 21, 2009 8:43:49 GMT
Right, but read the post again: they insist on the boiler under construction ( a professionally made one) to be tested to 2x WP because a professionally made is only tested to 1.5x WP. This really is over the top. Safety testing isn't some number game where higher is better. Oh - sorry Havoc, that didn't really make any sense to me.  DJ |
|
|
|
Post by teakfreak on Dec 23, 2009 20:28:24 GMT
There has been a little discussion of full size practice on another board recently. The boiler from 35006 has recently been hydraulically tested to 1.3x working pressure - apparently that was the norm for BR boilers. Must say, I always thought they did them to 1.5x w.p.
|
|
|
|
Post by Deleted on Dec 23, 2009 21:57:43 GMT
|
|
Smifffy
Statesman
Rock'n'Roll!
Posts: 943
|
Post by Smifffy on Dec 23, 2009 22:24:01 GMT
...that looks gorgeous!
Surely you won't ever want to light a fire in it and get it all dirty ? ;D
|
|
|
|
Post by baggo on Dec 24, 2009 1:15:27 GMT
Looks pretty good JB  Obviously, we expect you to have it connected up and steaming by New Year  John |
|
|
|
Post by Shawki Shlemon on Dec 24, 2009 4:08:29 GMT
Looks excellent , John , what we expect and what we get are two different things !!! ;D
|
|
|
|
Post by welshy on Dec 24, 2009 10:46:16 GMT
Very nice boiler John, lovely christmas pressie.
|
|
|
|
Post by havoc on Dec 24, 2009 11:54:59 GMT
Beautifull. I really think this is the way forward.
|
|
|
|
Post by Deleted on Dec 24, 2009 13:46:13 GMT
Delivered as promisedWho's a happy bunny then? It's a bit high at the cab end, but I think that is more to do with suspension spring adjustment than anything else. The pony truck roller is a full 1/4" off the bearing surface. I was a bit taken aback by the rounded edges, but that's welding for you, and I suppose I'd got used to my sharp edged effort! The manufacturing method did not include a tubeplate flange on which to mount the smokebox. This was resolved by making a stepped ring inserted into the mouth of the boiler, bringing the flange plate diameter up to the required 4.375". My existing smokebox fitted like a glove. I'd like to publicly thank Marco, Wesley and Ryan for their efforts and good humour: trouble is, I don't know how I'm going to keep away from the workshop for three days! JB  I couldn't resist trying my little efforts on the backhead! 
|
|
jvas
Active Member
Posts: 40
|
Post by jvas on Dec 24, 2009 13:50:18 GMT
John,
Ive been following this with great excitement and curiousity!!!
The boiler looks excellent.
Would it be rude to ask how much it cost?
Jeremy.
|
|
|
|
Post by Deleted on Dec 24, 2009 14:01:55 GMT
John, Ive been following this with great excitement and curiousity!!! The boiler looks excellent. Would it be rude to ask how much it cost? Jeremy. Jeremy. This boiler cost me much less than you would think, but I would prefer you to talk to Marco about it. The short lead time was worth a great deal to me, and, I suspect, other people who would like to get on with their project. BTW, I do not have any interest in the Company..... JB |
|
|
|
Post by drumkilbo on Dec 24, 2009 16:09:03 GMT
Looks really good JB, a big step forward ! What about cladding then as it looks as if the od of the boiler is the same as the od of the smokebox which was a problem I had with one, or will you just clad the firebox end ?
Ian.
|
|
|
|
Post by Deleted on Dec 24, 2009 16:17:59 GMT
Looks really good JB, a big step forward ! What about cladding then as it looks as if the od of the boiler is the same as the od of the smokebox which was a problem I had with one, or will you just clad the firebox end ? Ian. Ian. The boiler barrel is fractionally bigger than the smokebox, just sufficient to be masked by a bit of boiler banding over the smokebox next to the boiler face. However, I think I will be cladding both, as it is easier to do multiple rivet rows and lining on a flat sheet of brass! Merry Christmas JB |
|
|
|
Post by drumkilbo on Dec 24, 2009 18:32:30 GMT
Sounds good, I'll look forward to seeing a blow by blow description of the cladding fitting especially going from the square bit of the boiler with the rounded top corners to the roond barrel bit as I've to do that on a Hall boiler. I was briefly in the workshop today but the snow is still lying on the floor from when I stamped my feet in there about a week ago, so hasty retreat to the hoose !
Merry Christmas
Ian.
|
|
|
|
Post by alanstepney on Dec 25, 2009 3:08:33 GMT
That boiler certainly looks impressive, and the short delivery time is a definate advantage.
|
|
