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CHAPTER 7
FAULT FINDING
PROBLEM
1.
THE PUMP GIVEN NO
WATER
2.
UNSUFFICIENT
DELIVERY
3.
UNSUFFICIENT
PRESSURE
L
L
0
0
0
0
1
/
E
B
–
R
e
v
.
G
L
L
0
0
0
0
1
/
E
B
–
R
e
v
.
G
PROBABLE CAUSE
1.1 PUMP AND SUCTION PIPE NOT
WELL PRIMED, WITH AIR TRAPPED
IN THE SYSTEM.
1.2 AIR ENTER THE SYSTEM
THROUGH SUCTION PIPE OPEN
TAPS.
1.3 SUCTION HEAD TOO HIGH.
1.4 WRONG ROTATION DIRECTION.
1.5 THE TOTAL HEAD REQUIRED BY
THE SYSTEM IS HIGHER THAN
RATED PUMP HEAD.
2.1 FOREIGN BODIES AT IMPELLER
CHANNELS OR THE SAME CAUSES
AS POINTS 1.1, 1.3, 1.4, 1.5.
2.2 UNDERSIZED SUCTION PIPE
VALVE, OR WRONG POSITIONING
OF SUCTION PIPE.
2.3 WORN IMPELLER AND/OR PUMP
CASING.
3.1 LIQUID VISCOSITY HIGHER THAN
SPECIFIED AND/OR THE SAME
CAUSES AS POINT 1.4, 1.5, 2.3.
–
1
0
/
2
0
1
7
I
T
A
/
G
B
/
F
R
–
1
0
/
2
0
1
7
I
T
A
/
G
B
/
F
R
PRIME AGAIN PUMP AND
SUCTION PIPE.
CORRECT INSTALLATION.
CORRECT INSTALLATION.
SEE PAR. 5.1
THE PUMP IS NOT SUITED TO
THE DUTY REQUIRED.
REMOVE THE CAUSES.
CORRECT INSTALLATION.
SEE CHAP.8.
PUMP NOR SUITED TO THE
VISCOSITY AND/OR REMOVE
THE CAUSES.
10
REMEDY
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