Bennett Associates was commissioned to carry out the Finite
Element Analysis and the design optimisation of a compressor discharge case and
turbine shell for two of the largest gas turbine units in the world.
Up to this time the turbine shell and discharge casings had been
fabrications. It was now intended to produce these very complicated structures
as castings.
The ultimate client, a world leader in the supply and manufacture
of gas turbine power units, laid down strict parameters for ensuring the final
design would satisfy their requirements with regard to "safety, maintainability
and inspectability" as defined in the appropriate ASME Design Regulations.
Finite Element computer models were produced with fine enough mesh
to accurately predict mechanical and thermal behaviour of the compressor
discharge casing and turbine shell under a variety of loadcases.
The loadcases included simulations of normal start up and steady
state operating conditions. Path ovality was checked at steady state and at
worst state transient conditions.
The design of the 4 way joint between the two main casings was
particularly critical. A compliant bolting method had to be designed to ensure
the metal to metal joints remained 'gas tight' under all conditions.
Bennett Associates produced the detailed manufacturing, casting
and machining drawings requiring many cross sections through the very complex
castings.
For more information, contact us on
01709-373782.
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