Fristam Pumps FKL 15, Оригинальное руководство пользователя, Страница: 30 / 40

/ / FKL PUMP SERIES / / /
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Metal noise. Foreign objects in pump interior. Disassemble, inspect, and (if necessary) repair.
Rotor mechanically jammed, rotor fastener loose. Disassemble, rework, and
set correct clearance.
Excessive wear of bearings and gearwheels from
overloading or inadequate lubrication. Disassemble, inspect, and repair.

Regular maintenance; lubricant service
Speed too high. Use motor with frequency converter;
consult
Fristam .
Pump running dry; shaft seal running dry. Immediately supply pumping medium; immedi-
ately supply sealing water.
No high-temperature rotors (with larger clear-
ance) installed for pumping medium at elevated
temperatures. Check operating conditions;
consult
Fristam .
Excessive throttling of discharge line. Check operating conditions;
consult
Fristam .
Flow noise. Operation in overload or part-load range. Adjust working point to design.
Flow losses in suction line too high. Increase nominal sizes;
rule out the possibility of throttling.
Cavitation. Check condition for NPSH rating; see Chapter 6.5,
"Installation of Pipes," page 11 .
consult Fristam .
Vibrations. Weight and hydraulic forces of pipes stressing the
pump. Support pipes so that pump is not stressed; install
vibration dampers if necessary; keep water ham-
mers away from pump.
Excessive heating of pump
shaft bearings and drive gear. Bearing damage. Disassemble; replace bearing.
Lubricating oil inadequate. Change lubricating oil (see Table 3 on page 16 );
perform maintenance at regular intervals (see
Table 26 on page 29 ).
Motor power consumption too high. Resistance in discharge line too high; pump
throttled too much; flow rate too low. Increase nominal size of discharge line; open
throttle valve; reduce speed using frequency con-
verter on motor or control gear.
Viscosity and/or density of pumping medium too
high. Consult Fristam .
Rotors installed with inadequate clearance con-
trary to specifications. Consult Fristam .
Massive damage to pump shaft bearing or gear
motor. Disassemble and inspect;
consult
Fristam .
Leakage at shaft seal. Shaft seal mechanical damage or wear. Replace mechanical seal and rotary shaft seal
(including all secondary seals); possibly convert to
different materials; consult
Fristam .
Shaft seal running dry; suction head too high;
pumping medium temperature too high. Decrease geodesic suction head
1
; use double
shaft seal; consult Fristam .
Sealing or flushing water pressure too high. Adjust using throttle valve and pressure gauge.
Shaft seal materials not chemically resistant to
pumping medium; medium temperature too
high. Consult Fristam ;
convert to cooling or double shaft seal.
Sealing or flushing water pressure too low; sealing
water tubes clogged; shaft seal crusted or dam-
aged. Adjust sealing water inlet and outlet; clean sealing
water tubes; replace shaft seal.
Sealing water contaminated or too hot. Use drinking water-quality water with tempera-
ture of max. 70°C.
1
The "geodesic suction head" is the vertical distance between the suction-side liquid level and the center of the pump pipe connections.
Problem Possible Cause Remedy
Table 27 Troubleshooting table