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ASME PTC 20.2
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ASME PTC 20.2 1965 Edition, January 1, 1965 Overspeed Trip Systems for Steam Turbine-Generator Units
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Description / Abstract:
OBJECT AND SCOPE
The purposes of this Code are:
To establish guiding principles and specifications for overspeed trip systems that will apply to the equipment covered under this Code.
To establish test procedures to determine the following characteristics of overspeed trip systems:
Setting of overspeed trip
Short term deviation of trip speed
Long term deviation of trip speed
Signal transmission delay time
Emergency stop valve (s) closing time.
To determine over-all system performance from data obtained under Par. 1.02.
The purposes of this Code are:
To establish guiding principles and specifications for overspeed trip systems that will apply to the equipment covered under this Code.
To establish test procedures to determine the following characteristics of overspeed trip systems:
Setting of overspeed trip
Short term deviation of trip speed
Long term deviation of trip speed
Signal transmission delay time
Emergency stop valve (s) closing time.
To determine over-all system performance from data obtained under Par. 1.02.