Table of Contents
Advertisement
•
•
•
AEC/Appllcatlon Engineering
8. Pump is worn out.
9. Any changes in the fluid system or operation of the TDH unit, such as a new source
of supply, more lines added, inexperienced operators, etc.
I 0. Tightened end clearance.
11. Incorrect head position.
B. Pump starts, then loses prime.
I . Empty supply tank.
2. Vaporized fluid in the suction line.
3. Air leaks or pockets in the suction line; air is leaking through packing or the
mechanical seal.
4. Pump is worn out.
C. Pump is noisy.
I. Starved pump - heavy fluid cannot get to pump fast enough. Increase the suction
pipe size or reduce the length.
2. Cavitating pump - fluid has vaporized in the suction line. Increase the suction pipe
size or reduce the length; if pump is above the fluid, raise the fluid level closer to the
pump. If the fluid is above the pump, increase the head of fluid.
3. Check motor and pump alignment.
4. Bent shaft or rotor tooth. Fix or replace.
5. Chattering relief valve - increase pressure setting.
6. Anchor base or piping more securely to eliminate or reduce vibration.
7. Foreign object getting into the pump through the suction
port.
D. Pump not up to capacity.
I. Starving or cavitating - increase suction pipe size or reduce pipe length.
2. Partially clogged strainer.
3. Air leak in suction piping or along the pump shaft.
4. Pump is running too slowly. Check for proper motor wiring and speed.
5. Partially open bypass line around pump.
6. Stuck open relief valve or set too low.
7. Worn out pump .
8. Tighten end clearance.
TDH True Temp,... Series Hot 011 Temperature Control Units
Page 65
Advertisement
Table of Contents
