Atlas Copco QAS 500 - Page 102

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Derating diagram - Derating factor (%)
50 hz
Notes
1) Reference conditions for engine performance to ISO 3046-1.
2) See derating diagram or consult the factory for other conditions.
3) At reference conditions unless otherwise stated.
4) Rating definition (ISO 8528-1):
LTP: Limited Time Power is the maximum electrical power which a generating set is capable of delivering (at variable load), in the event of a
utility power failure (for up to 500 hours per year of which a maximum of 300 hours is continuous running). No overload is permitted on these
ratings. The alternator is peak continuous rated (as defined in ISO 8528-3) at 25°C.
PRP: Prime Power is the maximum power available during a variable power sequence, which may be run for an unlimited number of hours per
year, between stated maintenance intervals and under the stated ambient conditions. A 10% overload is permitted for 1 hour in 12 hours. The
permissible average power output during a 24h period shall not exceed the stated load factor as indicated above.
5) Specific mass fuel used: 0.86 kg/l.
Height
(m)
Temperature
(°C)
0 5 10 15 20 25 30 35 40 45 50
0 100 100 100 100 100 100 100 100 100 90 80
500 100 100 100 100 100 100 100 100 100 90 80
1000 100 100 100 100 100 100 100 100 100 90 80
1500 1001001001001001009595959080
2000 95 95 95 95 95 95 90 90 90 90 80
2500 90 90 90 90 90 90 85 85 85 NA NA
3000 85 85 85 85 85 85 85 85 85 NA NA
3500 80 80 80 80 80 80 80 NA NA NA NA
4000 75 75 75 75 75 75 75 NA NA NA NA