April 2008 Progress report
article by: John McMillan
We left the story last time with the boiler just delivered to
Chatham Steam. We were very anxious to have the boiler inspected by
the Insurance surveyor to ensure that they were happy with the work
we had planned. The boiler hadn't been inspected since it was
repaired at Pridhams back in the mid-1990s, so we felt it
appropriate to have a further inspection now in case any problems
had arisen in the intervening time.
We arranged a visit to Chatham to coincide with the Insurance
surveyor's examination, and we could show him the work that had
been carried out previously.
The inspection was very thorough and took most of the day, not
even stopping for lunch! Every surface was examined inside
and out, and every stay was tested. When he finished he pronounced
himself satisfied with the overall condition, only minor repairs to
a few stay heads being required, and we were greatly
relieved! We hadn't expected any serious problems, but it was
reassuring having this confirmed by independent examination. Whilst
the inspection was proceeding, we had discussions with Chatham
Steam about the specification of the boiler tubes (not as
straightforward as one might think), the fitting of the tubes and
other work to be carried out.
Since the inspection, the super heater header has been taken off
the boiler, but not before it put up a tremendous struggle! The
main steam pipe behind it was examined and found to be in a very
good condition, with none of the deterioration that has been found
on other Bulleid Pacifics. It wasn't strictly necessary to remove
the header, but at least we know the main steam pipe is sound, and
with the header removed it will be easier to re-cut the 80 seats
for the super heater elements. We have salvaged the original
steel clamps that hold the tubes to the header for re-use, and
finding ourselves a few short, were fortunate to obtain some from
our friends working on "Braunton" at the West Somerset Railway.
A lucky find at a meeting of the Bulleid Owners Group was a
250lbs.p.s.i. pressure plate which fits on the boiler back head. We
still need the matching one that identifies the boiler (No.1096 in
our case).
Work has continued on cleaning and painting the crinolines that
support the boiler cladding. These were made some years ago, and
have been modified to accommodate various fixtures and fittings on
the boiler as the cladding sheets were made. As a result, we have
identified some small repairs that will be needed before final
fitting.
Whilst the boiler has been away from Toddington we've progressed
with work that needs to be carried out between the frames.
All the valve rods have been given a final refurbishment and
inspection. Cleaning and polishing the rods not only makes
them look good, it also removes any scratches where a crack could
start to develop. The Winter weather has hampered our work on
the valve rod pins, as the cold makes it impossible to obtain
accurate dimensions. So far we have machined about 15 pins that
hold the joints of the valve gear together. These were then sent
away for case hardening to give a hard-wearing surface that will
take the load when the loco is running. As expected, the case
hardening distorted the longer pins and we had to carefully heat
and press them back within acceptable tolerances. They were
originally deliberately machined slightly over-size, and can now be
machined back to their final true size.
On the tender, the brake block holders have been fettled so that
the blocks sit securely against them. The blocks are held in place
by a long tapered key. We have a motley collection of keys
acquired over the years from various railway works and scrap
yards. These are now being ground to shape so they will fit
nicely in the holder, but can be removed with a few hammer taps
when brake blocks need changing. The pins that join the
holders to the hanger arms have been case hardened, and are ready
to be fitted.
As usual, progress will be dictated by the availability of
funds, so if you feel moved to help us towards the 'final
straight', please contact me via the website.