Troubleshooting - Samoa 561610 Guía De Servicio Técnico Y Recambio

TROUBLESHOOTING

Symptoms Possible causes
The motor is not powered.
The pump does not start. Incorrect supply voltage.
Valves on suction and/or discharge pipes closed.
Suction filter clogged.
Presence of air in the suction pipe.
The pump does not suck
liquid at startup.
High-pressure losses in the suction line.
Fluid too viscous.
Over voltage and/or over current.
Pressure and/or flow rate
Presence of air in pipes.
pulses in the
discharge line.
Intermittent opening of the by-pass valve.
Foot valve not working properly.
Presence of air in pipes.
The pump is noisy
and vibrates. Caivitation.
Ball bearing and/or bush failure.
The flow rate does not
Pump saturation.
increase as the speed of
rotation increases.
Excessive speed of rotation in relation to the fluid viscosity. Increase the fluid temperature.
By-pass valve opening.
Cavitation.
Progressive reduction of
the discharge flow rate
By-pass valve opening.
and/or pressure, with
Friction increase by thermal effect.
constant speed of rotation.
Gear shim adjustment to a given clearance gear.
Decrease in viscosity due to the temperature increase.
SAMOA Industrial, S.A. · Pol. Ind. Porceyo, I-14 · Camino del Fontán, 831 · 33392 - Gijón - Spain · Tel.: +34 985 381 488 · www.samoaindustrial.com
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 by-pass valve spring preload.
Decrease pressure losses in the suction line.
Change fluid temperature.
Increase by-pass valve spring preload.
Cool the fluid.
Grind read cover.
Decrease the fluid temperature.
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