BENTLY NEVADA 135613-01 Case Expansion Transducer

Description

An important position measurement in Turbine Supervisory Instrumentation (TSI) is case expansion.

Case expansion (sometimes referred to as shell expansion) is the thermal growth of the machine case as it expands during machine startup and on-line operations.

The case expansion transducer system is typically mounted on the foundation at the opposite end from where the turbine casing is attached to the foundation and provides information about the growth of the machine case relative to the foundation.
Case expansion measurements also enable you to determine whether machine conditions are exceeding expected temperature growth differentials.

This is primarily a startup parameter that determines whether the machine casing and rotor grow thermally at nearly the same rate.

Different rates of thermal growth can cause the rotating and stationary parts of the machine to rub.

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