Steam Department

We had a good turnout at the steam shop this weekend and I am glad to say that there is major progress to report

On 1630:

Progress in fitting fire tubes

·         The new tube roller has not yet arrived but we did establish a reliable "production line" expanding ends into place with the punch expander.  Once the new roller arrives, hopefully in the coming week, it should have the ability to both finally seat the tube ends and flare the projecting end piece in preparation for beading.  The number expanded this weekend was more than in all previous sessions combined.  We could probably have done all the expansion this weekend but gave possession of the firebox whenever needed for the more critical work described below.

Engineers side now all expanded

All the ends are now expanded on the engineer's side.  This was done as we should be able to work on the fireman's side when  much of the work is being done on the patch ...... just not the heavy work done this weekend.

The punch expander avoids almost all the issues of ferrules moving.  However, just when we thought we were safe, having done 60 tubes without incident, one ferrule shifted.  After much cursing the tube was extracted and a replacement squeezed back in.  The problem child was then fitted with a new ferrule and successfully expanded.

·         The other major progress was on the corner patch.  After all the careful bending and drilling to get it tight to the mud ring we got to the stage of introducing the three dimensional shaping to fit to the side and front sheets.  This is a pretty brutal exercise requiring Dennis to work close up and personal with a large heating torch then rapidly switch to wield a range of heavy hammers in a confined space.

Early stages of heating

Early in the process you can see the basic heating technique and also that, at this stage, the patch stands substantially proud of the front and side sheets along the top.  The patch is of thicker steel than the existing firebox sheets so will always be proud by the distance that can be seen at the bottom, where both patch and sheet are tightly bolted to the mud ring.

Hard work in a tight space

Once it is suitably hot, Dennis applies a little "gentle persuasion".

It is a slow and hot job.  The heat reflects from the sheet and there is quite limited room to swing hammers in the confined space of the firebox.  Despite the brute force involved it must also be accurate.  The gap between the patch and the sheet, where the welding will be done, must be small and even.  There was a long pause during the day when it became clear that grinding was required where the patch was contacting the firebox sheet.  Once you have the patch red hot, it is quite a long wait before it cools enough to grind.

Later in the day, once clearance had been adjusted by grinding, the process resumed. 

Later stages of heating

Forming the corner into place

Aligned on all edges

By end of day the patch was pretty much aligned with the firebox sheets.  You can see that the edge against the side sheet now shows an even projection from top to bottom.  Checking the back of the sheet thru the mud ring access hole shows the patch pretty much flush with the sheets at the back.  The intent was not to get it quite flush as it was still VERY hot and it may move back marginally further as it cools.  The next stage is to drill the remaining rivet holes in the patch, refit it and finally adjust as necessary.

More tasks are now progressing to prepare for assembly of the locomotive once we have the boiler work completed.

·         Brian and others worked on producing a cardboard template of the smokebox front ring (where the smokebox front is bolted to the smokebox drum).  A gasket must be produced to seal this  joint and the template is the basis for this.  While this joint may seem pretty mundane it is actually critical to effective operation.  In service the smokebox operates at a significant vacuum and at high temperature.  Air leaking in can cause loss of power and damage from burning, if the air allows cinders to re-ignite in the smokebox.

·         Phil continued with the cab curtains.  He has enlisted his mother to make the new ones.  Many thanks.  Sewing skills are in pretty short supply in the steam shop !.  The job grows the more that you take apart. Having removed the awning from above the engineer's cab window it is now apparent that the wooden beam attached to the cab side has substantially rotted away and will need to be replaced.

In other areas:

·         Stu and Bob continued work on the planer.  Unfortunately it was not clear if they were further forward at the end of the day.  While the valve block is now back in place, it was found that the large diameter hydraulic connection was not in great shape.  Since this carries a 2000psi pressure, it will need to be reconstructed before the unit can be further assembled;

Stu and Bob work on the planer

·         Work continued on the compressor.  This demonstrated the problems of stopping a job for several years.  A few short test runs demonstrated an interesting tendency to produce a strange light brown froth from the oil pump.  Opening and inspecting the crankcase revealed about 2/3 oil floating on 1/3 water !.  As Collin said, I REALLY thought I had changed the oil when I rebuilt the valves 3 years ago !.  So, after a through clean of the crankcase and oil galleries, followed by new oil and filter, operation looks much more normal.  Once we can mount it properly and set up basic connection to the reservoir, we should be able to test it under load for a period.

So a very successful weekend.  Let's hope we can keep up the momentum next week.

Nigel

There was a good deal of progress in the steam shop this weekend.  It was a rather shortened day as I attended the Board meeting in the morning and the development of the winter storm had a number of people who live to the North leaving earlier than usual.

Progress in fitting fire tubes

On 1630:

·         First priority was that Dennis worked with Mike and Jerry on the corner patch.    Completing the patch is the critical path item as we cannot plan even initial hydro testing of the tubes until the boiler is water tight in this area!.  A few adjustments were necessary to get the edges to align exactly where Dennis needs them to provide the correct spacing for welding.  Once this is complete they will move on to heat the patch in situ in order to finally bend it into the complex shape needed to match the inner firebox.  The trick with forming the patch is that it must be formed accurately in 3 dimensions as it must fit not only to the obvious bend around the mud ring but to align with the tubesheet, which is not vertical but slopes forward.

·         The statistics on tube rolling do not look impressive.  We are now about 25% thru rolling the firebox end.  However this conceals some critical progress.  The time spent rolling tubes was limited as Dennis and the team working on the patch had first call on access to the firebox and the new tube roller will not arrive until the coming week.  However, we did manage to roll all the tubes that had been problematic last week. 

·         We do now believe that we have the issue of the "walking" ferrules solved.  It seems that, when fitting ferruled tubes at the firebox end, they should not be simply rolled into place.  The essential tool is a segmented punch similar to that used to expand the ferrules into place.  The difference is that this one has projections that seat on the tube sheet around the tube (to stop it driving the tube forward).  When driven by an air hammer, the segments expand with sufficient force to expand the tube.  The major difference from the roller is that the punch expands slightly more on the boiler side creating a taper which prevents the ferrule moving forward (the roller would tend to taper the other way encouraging the ferrule to "walk").  Apparently some railroads fitted the firebox ends solely using these punches, normally applied three times to each tube to ensure an even seal.  Given that we have the roller, we will now fit the tube with one application of this expander then roll briefly to ensure an even seal.  This should be more efficient as the toughest part is getting the punch back out after it has been air hammered into place.

·         Ed and Phil progressed steadily with the replacement pipe work along the boiler.

In other areas

·         Richard and Bob test wired the new compressor to its control panel.  This allowed us to run the motor and compressor briefly and confirm that the electrical supply works as planned.  (It should start at a reduced power and then step up to full power after a short delay, which this test proved it is doing correctly.)  The reservoir was moved back to the compressor area so, in the next couple of weeks, we should be able to mount the compressor to the floor, fabricate a new air intake filter (as one is missing) and then connect the compressor to the reservoir, which will enable full testing.

·         Jeff is finalizing the layout for the pipe work and we should get the scissor lift in shortly so that we can start fixing the pipe work into the roof of the shop.

·         Bob continued with rebuilding the control gear for the planer.

No pictures this week as most of what was happening was continuing existing activities (and I was too busy doing the job to photograph the tube expander in operation !!).  However significant progress was made on a number of important tasks.

Nigel

There was continuing progress this weekend although we did encounter some issues that made progress a good deal slower than we would have hoped.

On 1630:

Progress in fitting fire tubes

·         The central focus was on rolling tubes.  A further 17 tubes were successfully rolled at the firebox end.  However this was far less than we had hoped as a result of an occasional problem which causes the ferrule to move along the tube as the tube expands into the sheet.  When this happens, the tube and the ferrule must be removed and replaced.  This is very time consuming and cannot be allowed to happen often as we have only a limited number of spare tubes.

·         After a good deal of testing and investigation of possible causes we will acquire a new tube roller during the week and are hopeful that this will cure the problem.  Once we can overcome this issue progress should be a good deal faster.  We probably rolled the 17 tubes in less than an hour and the remaining six hours were spent in removing and replacing the damaged tubes a s well as trying to resolve the issue.

The area of rolled tubes slowly expands

·         Ed continued fitting the replacement pipe work along the boiler and has now completed the most difficult runs.

·         The patch is now bolted into place and we are waiting on Dennis's availability to finally heat shape it into alignment with the existing inner firebox sheets ready for welding.

·         Work continued on cleaning out the cab for refitting.  The canvas curtains are now off and will be measured for production of the replacements.  Canvas has a finite life after which it falls apart very easily.  I think we can safely say that the finite life of these curtains has been reached!!.

In other areas:

·         Stu and Bob made good progress on the planer.  Most of the major assemblies have now been cleaned and prepared.  The bed is ready for them to be refitted and the new electrical control system is being assembled.  The various connecting pipes were measured to order replacements.  Let's just hope the guys have a good plan of what connects to what !;

Stu and Bob work on the planer

Bob has started to assemble the electrics

·         The area around the new compressor was cleared ready for final positioning.  Once we have it positioned we can install the vibration isolating mounts and prepare to wire it up.

Compressor ready to mount

·         Work also started on preparing the Shay truck for re-assembly.  The bolster must be drilled as the central hole, thru which runs the mounting pin, had developed an interesting oval shape.  Purists believe that a round pin is best located in a round hole so this has been built up with weld and will now be drilled to produce a hole of the correct diameter.

Bolster set up for machining

So reasonable progress on a number of fronts.  Hopefully next week we can get tube rolling to progress more reliably and move on with that.

Nigel