Werbung
Trouble shooting / Anomalías y soluciones / Probleme und deren Lösungen
GB
Symptoms
The pump does not start.
The pump does not suck liquid at
startup.
Pressure and/or flow rate pulses in
the discharge line.
The pump is noisy and vibrates.
The flow rate does not increase as
the speed of rotation increases.
Progressive reduction of the dis-
charge flow rate and/or pressure,
with constant speed of rotation.
4
856 804 R. 01/14
SAMOA Industrial, S.A. · Pol. Ind. Porceyo, I-14 · Camino del Fontán, 831 · 33392 - Gijón - Spain · Tel.: +34 985 381 488 · www.samoaindustrial.com
Possible causes
The motor is not powered.
Incorrect supply voltage.
Valves on suction and/or discharge pipes
closed.
Suction filter clogged.
Presence of air in the suction pipe.
High-pressure losses in the suction line.
Fluid too viscous.
Over voltage and/or over current.
Presence of air in pipes.
Intermittent opening of the by-pass valve.
Foot valve not working properly.
Presence of air in pipes.
Caivitation.
Ball bearing and/or bush failure.
Pump saturation.
Excessive speed of rotation in relation to the
fluid viscosity.
By-pass valve opening.
Cavitation.
By-pass valve opening.
Friction increase by thermal effect.
Gear shim adjustment to a given clearance gear. Grind read cover.
Decrease in viscosity due to the temperature
increase.
Solutions
Verify electrical connections and thermal
protections.
Verify rating and motor connections.
Open valves.
Disassemble and clean the filter.
Drain pipes. Remove siphons.
Tighten fittings and flanges.
Increase the pipe diameter. Remove abrupt
variations of section and direction.
Preheat the fluid.
Stabilize the mains voltage.
Drain pipes. Remove siphons.
Tighten fitting and flanges.
Icrease the valve operating pressure.
Replace with free ball foot valve.
Drain pipes. Remove siphons.
Tighten fitting and flanges.
Decrease pressure losses in the suction line.
Change fluid temperature.
Replace ball bearing and/or bushes.
Decrease pressure losses in pipes.
Reduce fluid viscosity.
Increase the fluid temperature.
Increase by-pass valve spring preload.
Decrease pressure losses in the suction line.
Change fluid temperature.
Increase by-pass valve spring preload.
Cool the fluid.
Decrease the fluid temperature.
Werbung
