This standard covers the mechanical design, engineering, fabrication, installation, testing, and protection of fossil power plant instrumentation sensing and control lines. The boundaries of this standard span the process tap root valve to the instrument connection. This standard applies to all fluid media (liquid, gas, or vapor).
ANSI/ISA 77.70-2005 history
2005ANSI/ISA 77.70-2005 Fossil Fuel Power Plant Instrument Piping Installation