A
B
C
D*
Rotor
Series
1.50 2.38
2.94 1.94 A
1.75 2.75
3.31 1.63 B
2.00 3.00
3.31 1.75 C
2.38 3.50
3.75 2.06 D
2.75 4.00
4.12 2.19 E
*These dimensions are for standard seals only.
Figure 2
3-3.
TROUBLES.
To reliably establish the performance of either the pump or driver, instruments such as tachometers, pressure
gauges and electric meters must be in proper working condition and preferably of recent calibration. In many cases, much time
and expense have been expended with faulty instruments. Table VI lists a number of troubles commonly occurring. If unable to
determine the cause, and remedy the trouble from this list, refer the problem to the Peerless Pump representative.
TABLE VI
TROUBLES
TROUBLE PROBABLE
CAUSE
REMEDY
Failure to deliver liquid or sufficient
pressure
Pump not primed.
Pump not up to speed.
Discharge head too high.
Insufficient available NPSH.
Incorrect direction of rotation.
Air leaks in suction line or through stuffing
boxes.
Impeller passages restricted.
Worn wearing rings.
Damaged impeller.
Foot valve too small or restricted by dirt.
Re-prime.
Check for low motor voltage or motor over-
load. Other drives, increase driver speed
when possible.
Check to see that all discharge valves are
opened and the discharge line is free from
obstructions. In some cases, the installation has
to be altered or a pump of suitable rating must be
provided.
Check NPSH requirements of pump and
increase system NPSH accordingly.
Check the impeller assembly for correct rotation
either by removing upper case or through
priming connection. Check rotation of driver.
Check mechanical seal. Check for air leak
between gland and stuffing box face. Check for
air leaks between sleeve and shaft and replace
O-ring if there is an air leak. Check all suction
line joints for bad gaskets and loose joints.
Disassemble the pump and clean impeller.
Replace worn parts.
Replace or repair impeller.
Replace with adequate size foot valve or clean
foot valve.
Pump loses prime after starting
Air leaks in suction line, or thru stuffing
boxes.
Insufficient available NPSH.
Check mechanical seal. Check for air leak
between gland and stuffing box face. Check for
air leaks between sleeve and shaft and replace
O-ring if there is an air leak. Check all suction
line joints for bad gaskets and loose joints.
Check NPSH requirements of the pump and
increase the system available NPSH accordingly.
7
4851959
