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Normal Temperature and Pressure (NTP)

A temperature of 70°F (21°C) and a pressure of 1 atmosphere [14.7 psia (101 kPa)].
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Related Code Sections

17.17 Initiating Devices, Supervisory Signal-Initiating Devices
signals shall be initiated: one indicating that the required pressure has increased or decreased (off-normal), and the other indicating restoration ...
424.73 Equipment for General Use, Overtemperature Limit Control
Each boiler designed so that in normal operation there is no change in state of the heat transfer medium shall be equipped with a temperature ...