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GB04.jpg [ 65.78 KiB | Viewed 7622 times ] |
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GB05.jpg [ 65.15 KiB | Viewed 7609 times ] |
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| German Locomotive Boiler Repair Standards https://www.rypn.org/forums/viewtopic.php?f=1&t=29048 |
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| Author: | M Austin [ Tue Mar 09, 2010 7:20 am ] | ||||
| Post subject: | German Locomotive Boiler Repair Standards | ||||
See Photos ->READ FROM GERMAN WIKIPEDIA<-
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| Author: | M Austin [ Tue Mar 09, 2010 7:24 am ] | ||||
| Post subject: | Re: German Locomotive Boiler Repair Standards | ||||
More Photos
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| Author: | Dave [ Tue Mar 09, 2010 9:19 am ] |
| Post subject: | Re: German Locomotive Boiler Repair Standards |
Without narration I'm reading a lot into these images, but it seems the strategic leaving of the bottom knuckle of the RTS to support the combustion chamber while the throat sheet is being replaced is brilliant in its simplicity. Something holds the datum instead of having to find it again somewhere out in the air...... I take it we are looking at the same boiler at various times in its overhaul? dave |
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| Author: | jim templin [ Tue Mar 09, 2010 3:34 pm ] |
| Post subject: | Re: German Locomotive Boiler Repair Standards |
On first glance there seem to be an awful lot of square corners on the patches, and there seem to be a lot of the patches themselves. I also think I am seeing some older welded repairs that seem not to have had full penetration. They don't seem to have the same respect for stress risers that the NBIC/ASME codes have. |
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| Author: | CCDW [ Tue Mar 09, 2010 3:42 pm ] |
| Post subject: | Re: German Locomotive Boiler Repair Standards |
Where did the piece in the last image come from? |
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| Author: | M Austin [ Tue Mar 09, 2010 10:50 pm ] | ||
| Post subject: | Re: German Locomotive Boiler Repair Standards | ||
It seems the EU style is to use a mud trough instead of a mud ring (more properly a Foundation Ring) for the bottom attachment of the firebox sheets.
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| Author: | Gary P Bensman [ Tue Mar 09, 2010 11:45 pm ] |
| Post subject: | Re: German Locomotive Boiler Repair Standards |
Right Matt, the mud trough appears to be a pressed steel (maybe 3/4" thick) Tross foundation ring. I have also seen this produced from square steel stock with the trough milled out. This superior design removes the corner joint between the mud ring and wrapper/side sheets where much grooving corrosion is seen to concentrate. The mud gathers in the bottom of the trough and the butt-weld joint to the wrapper and side sheets is much above the bottom of the trough. You can also see where they have removed the sleeve for the corner washout plug. This location for the front corner washouts provides for complete draining of the boiler - every drop ! |
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| Author: | jim templin [ Wed Mar 10, 2010 12:52 am ] |
| Post subject: | Re: German Locomotive Boiler Repair Standards |
Was this boiler one with the fillet welded stays? the stay holes left seem awfully clean.... |
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| Author: | Gary P Bensman [ Wed Mar 10, 2010 7:44 pm ] |
| Post subject: | Re: German Locomotive Boiler Repair Standards |
Sure does appear to be all fillet welded stays - rigids and flexibles. Also note that they put on a new smokebox and a new bottom to all 3 boiler courses. |
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| Author: | Michael Allen [ Fri Mar 12, 2010 2:30 pm ] |
| Post subject: | Re: German Locomotive Boiler Repair Standards |
I think Jim's comment about numerous square corner patches is a mis-reading of the photos. Those look like burn lines. They appear to be taking the throat sheet out in small pieces. Any ideas why? Michael Allen |
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| Author: | jim templin [ Fri Mar 12, 2010 8:54 pm ] |
| Post subject: | Re: German Locomotive Boiler Repair Standards |
Good Lord, man, I know the difference between burn lines and weld lines....if you will notice the barrell patches all have square corners. |
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| Author: | Dave [ Fri Mar 12, 2010 11:46 pm ] |
| Post subject: | Re: German Locomotive Boiler Repair Standards |
Are we talking about the edges of the butt seam? I can't see if square or beveled on my monitor. dave |
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| Author: | Mike Tillger [ Sat Mar 13, 2010 6:05 pm ] |
| Post subject: | Re: German Locomotive Boiler Repair Standards |
Dave, I believe Jim means the corners of the individual flush patches, not the seams. Mike Tillger |
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| Author: | M Austin [ Mon Mar 15, 2010 8:16 am ] |
| Post subject: | Re: German Locomotive Boiler Repair Standards |
jim templin wrote: if you will notice the barrell patches all have square corners. 6" offset on long seams is American practice also. Functions as crack arrester. jim templin wrote: They don't seem to have the same respect for stress risers that the NBIC/ASME codes have. Amen. Dave wrote: Something holds the datum instead of having to find it again somewhere out in the air...... With so much of the boiler gone, and chains holding it to the floor, is the "vaulting" Tross speaks of, actually the boiler trying to do somersaults on the shop floor chasing the elusive datum? |
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| Author: | M Austin [ Mon Mar 15, 2010 8:34 am ] |
| Post subject: | Re: German Locomotive Boiler Repair Standards |
What I do see: IN GB04: Stitch welds already in the seams One long seam 18" above new repair seam IN GB05: New first course with front tube sheet Tacked in long seams with very poor fit-up One and a half rows of lateral stays Throat sheet is gone, combustion chamber throat is gone, side sheets gone, door sheet and lower backhead gone and crown sheet. What I don't see: No evidence of staying area above tubes in front tube sheet No evidence of staying area above backhead staybolts Inadequate staying of wrapper sheet (if the washout holes are fillet welded in, they provide no reinforcement for the area of the wrapper sheet removed What I would like to know: How cheap is labor that they can replace about 2/3 of the boiler steel that it is an economical repair? What caused so much damage that most of the bottom half of the boiler has to be replaced? |
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