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 Dresser-Rand offers a broad range of products for
a variety of applications, and recognizes service as a critical component to satisfying
its clients' requirements. The company is able to support this broad product lineup
through a dedicated division whose charter is to provide thorough aftermarket service.
Like many other plant level activities today, there is an increased use and acceptance of
turbo shaft weld repairing. This is being driven by the general emphasis on operating
and maintaining existing capital equipment in the absence of significant new plant
construction in the energy intensive industries. Successfully completed shaft repairs in
the United States and throughout the world have revealed that shaft weld repair is a
viable alternative to retirement.
 Evaluation
Upon receipt of the client's damaged rotor, a full
dimensional and Non Destructive Examination (NDE) of the shaft is performed. An inspection
report of the damage and the NDE results, including the unit’s current
operating conditions, are forwarded to the Dresser-Rand Support Engineering Group. The
original equipment files are reviewed to obtain the material specifications of the shaft
and its design criteria. This evaluation determines the feasibility of weld
repair for the
damaged shaft.
Solution
Restoring the damaged shaft to drawing specifications is
accomplished by applying Dresser-Rand’s Computer Assisted Tungsten Inert Gas
(CA-TIG)
weld process utilizing qualified and proven procedures to build up the shaft
after the damaged area has been removed through an OEM machining process.
These procedures include post-weld heat treatment and non-destructive testing in
accordance with the original material and manufacturing specifications of the unit. Upon
completion of all weld repairs, machining and inspection, the shaft is ground to restore
original dimensions, run-out and finish specifications.
The availability of factory support and
procedures
in remote repair centers provides our client with access to the original
equipment manufacturing which can be applied to a repair without having to reverse
engineer a component or speculate on the material specifications. This information
allows Dresser-Rand to fully evaluate repair situations and complete component repairs
that meet or exceed original equipment specifications on a routine basis.
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| Close-up of first
weld layer on journal. |
Machining after
welding for NDT prior to grinding taper and cutting keyway. |
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