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AEC/Appllcatlon Engineering
Pressure Gauge -
Discharge Port
I. High reading indicates:
•
•
fluid has high viscosity and small and/or long discharge line
•
partially closed gate valve
•
plugged filter
•
line partially plugged from buildup
•
fluid in pipe not up to temperature
•
fluid in pipe underwent a chemical reaction and solidified
•
relief valve set too high
2. Low reading indicates:
•
relief valve is set too high
•
relief valve poppet is not seating properly
•
bypass around the pump is partially open
•
too much extra clearance
•
worn pump
•
3. Fluttering, jumping, or erratic readings:
•
cavitation
•
fluid coming to the pump in slugs
•
air leak in the suction line
•
vibrating from misalignment or mechanical problems
Detennlnlng Pump Problems
A.
Pump does not pump.
I . Pump lost priming - possible air leak, low
tank
levels, stuck foot valve.
2. Suction lift is too high.
3. Pump is rotating in the wrong direction.
4. The motor is not running at the proper speed.
5. Suction and discharge valves are not open.
6. Clogged strainer.
7. Open bypass valve, relief valve is set too low, relief valve poppet stuck open.
•
Page 64
TOH TrueTemp"' Serles Hot 011 Temperature Control Units
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