BLACKMER XLW2E-N, Инструкции по установке, эксплуатации и обслуживанию

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105-B00 Page 15/16
PUMP TROUBLESHOOTING
LOW DELIVERY RATE
Probable Cause Corrective Action
Relief valve setting too low, causing the liquid to
bypass. The relief valve setting should be 20 psi (1.4 bar) higher than the
differential pressure.
OTHER POSSIBLE CAUSES OF A LOW DELIVERY
RATE:
Check pipe joints for leakage of air. Sometimes when recirculating liquid
in a tank, the returning liquid falling through the air carries air down
into the tank, which eventually gets back into the pump.

Restriction in the suction line.

Suction valve not fully open.

Resistance in the discharge line.

Air leaks in the suction line.

Damaged or worn pump parts.

Pump speed too low or too high.

Relief valve leaking.

Relief valve sticking open, or not properly seating.

Dirty strainer.

Liner installed backwards

Vanes install incorrectly

Excessive restriction in discharge line causing RV to open.
EXCESSIVE NOISE AND VIBRATION
Probable Cause Corrective Action
Cavitation or vaporization of the liquid resulting from
excessive vacuum on the pump due to starved
suction.
Check for:

Inlet piping too long or too small in diameter.

Strainer plugged or dirty.

Undersized or restrictive fittings, such as globe valves or partially
closed valves.

Excessive amount of elbows.

Suction lift too great.

Pump speed too high for the viscosity of the liquid being pumped.
Entrained air or vapors in the pump. Check pipe joints for leakage of air. Sometimes when recirculating liquid
in a tank, the returning liquid falling through the air carries air down
into the tank, which eventually gets back into the pump.
Pump speeds exceed the recommended maximum. Check the recommended RPM for your specific application.
Liner Installed Backwards The word “INTAKE”, which is cast on the liner MUST be towards the
intake side of the pump
Continual or long term bypassing of liquid through
relief valve.
Check for restriction in the discharge line, or an improper relief valve
adjustment (See "Relief Valve" on Page 6).
OTHER POSSIBLE CAUSES OF NOISE AND VIBRATION:

Excessively worn vanes, discs or rotor.

Bearing Worn or Damaged.

Loose or improperly installed piping.

Misalignment of pump and driver or bent shaft.

Pump base not properly mounted.

Insufficient Oil in the Gear Reducer
POOR OR NO PRIMING
Probable Cause

Air leaks in the suction line.

Valve partially closed or other restriction in the
suction line.

Damaged or worn pump parts.

Too much lift for the vapor pressure of the fluid.

A dirty or clogged strainer.

Worn vanes.

Suction Valve Closed.

Incorrect pump rotation

Relief Valve partially open, valve not seating properly.

Pump speed too low for priming