The Power Plant 69 



the engineer of the smallest plant will discover a few 

 suggestions that will help him to reach a higher 

 efficiency and a lower cost in his department. 



For the boiler room we recommend Recording 

 Pressure Gauges for steam, Recording and Indicat- 

 ing Thermometers for feed-water, stack, steam, and 

 economizer temperatures; Recording and Indicating 

 Draft Gauges, and a CO Recorder for flue-gas 

 analysis. 



In the refrigerating room, thermometers should be 

 provided for the ammonia compressors, freezing 

 tanks, condenser-water, forecooler-water, liquid am- 

 monia, brine lines and brine tanks. A Two-Pen 

 Recording Pressure 'Gauge for both low and high 

 pressure ammonia attached to the compressor will 

 give a positive check on the efficiency of its operation. 



A knowledge of the temperatures of the brine 

 entering and leaving the cooler is of utmost im- 

 portance to a dairyman. Unless he has accurate 

 and continuous information of these temperatures 

 the efficiency of the plant cannot be maintained. Re- 

 cording thermometers tell the whole story, and from 

 a study of the charts the temperature of brine flow 

 and refrigerant can be regulated. 



For the condenser-water, recording thermometers 

 make it possible for the operator to estimate the 

 number of gallons required per ton of refrigeration 

 by recording the temperature of the water as it runs 

 on the condenser and as it leaves. They give also a 

 check on operating conditions. If the records show 

 an increase of temperature above normal of the 

 water leaving the condenser, the water pump, or 

 system needs attention. If the temperature of the 

 water running over the condenser shows a decrease, 

 less ammonia has been delivered to the condenser. 



On the ammonia compressor, recording thermome- 



