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After the repairs, the process is reversed with the rams raising each end of the boilers slightly to remove the packing plates and then lowering the boilers till they rest on the restored saddles and floors. 
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E-mail: contact Sydney Heritage Fleet at bclayton@shf.org.au |
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The
John Oxley was fitted during her construction in 1927 with 2 Scotch wetback 
To
repair the floors the boilers needed to be raised off the floors. They could not be lifted by crane from
above without removing the superstructure. They could not be raised from the hull underneath due to its
weak structural condition.
It
was finally decided to build a supporting structure up from the dock with a saddle supported by struts
through the hull. Thereby relieving the hull from the weight to do the repairs.
Load
bearing girders were placed on the dock beneath each of the boilers. Struts were arranged at each end of
each boiler whereby a hydraulic ram could raise the struts with the temporary plate saddle from the
supporting structure on the dock. See diagram below.
After
long deliberations, the boilers were lifted off their stools without much effort in September 2005. Each
end of the boiler was raised about 25 mm in turn and 20 mm of packing plates inserted. The ram was
lowered till the weight was taken on the packing plates and the ram could be taken away for use on the
other side of the same boiler. The same sequence was followed on the second boiler.
