The most common reason a slaker will be alarming with a High-High temperature alarm is if there is too much quicklime being fed into the slaker relative to the amount of water or if the incoming slaking water is bringing heat with it. Check the actual output of the feed device (see “What is ‘feeder calibration’?).
Other possible reasons include:
- Quicklime is flooding though the feed device
- Water supply is not supplying enough water (restrictions)
- Look for possible low flow alarm
- Incoming slaker feed water temperature is too high
- The temperature sensing instrument is failing
- Check the temperature of slaking water coming in before it enters the lime slaking reaction zone.