In the following circumstances, the changing of air temperature and air pressure shall be strictly monitored:
1. The load is increasing or decreasing.
2. The combustion is not stable.
3. The high-temperature heater is operated or stopped.
4. The coal kinds are changing greatly.
5. When the change of feed water pressure is big.
6. When the heating surface soot blowing happens.
7. When the overflow is serious.
8. When  load rejection happens.
9. When the coal feeder is started or stopped.   （lsh）