Derate is calculated with continuous duty @ rated RPM starting at 100°F and 1500 feet altitude. Continuous duty: The load and speed that can be applied without interruption except for normal maintenance. All ratings are corrected to 500' (152m) altitude, 29.38" (746mm) Hg. And temperature of 85°F (29°C). Natural gas ratings are based on use of 900 BTU (33.5 J/cm3) LHV gas.
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