Other Information; Faults And Operating Problems; Flowrate Lower Than Expected; Flow Rate Irregular Or Higher Than Expected - OBL X9 Series Operating Manual

X9 Series metering pumps
the new set pressure value required
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9.

OTHER INFORMATION

9.1

FAULTS AND OPERATING PROBLEMS

The tables below are not exhaustive. They contain possible causes and suggested remedy for the most common and recurring faults.
9.1.1

Flowrate lower than expected

GB
- Air enters from suction pipeline fittings
- Air trapped inside the pump
- Suction head (suction lift) too high
- Vapour tension too high
- Pumping temperature too high
- Handled fluid viscosity too high
- Suction tank sealed and/or without vent
- Suction pipeline clogged or closed by valves
- Filter on suction pipeline clogged
- Pumps valves dirty, worn or reassembled in wrong
direction
- Safety valve pressure setting is too low
- Plunger packing damaged
- Wrong flowrate adjustment setting
9.1.2

Flow rate irregular or higher than expected

- Suction pressure higher than discharge pressure
- Backpressure valve stuck in open position because
of dirty or set pressure is too low
- Pump valves jammed in open position
9.1.3

Overheating of pump body and/or motor

- Incorrect electrical connections
- Actual pump working pressure higher than the
maximum allowed
- Discharge pipeline may have reduced section
causing a drastic increase of working pressure
- Plant pipelines transmits stress to the pump
connections
- Discharge pipeline clogged or valve closed
- Backpressure valve set pressure is higher than
maximum allowed
- Low level of lubricant oil or chemically contaminated - Check and if necessary change the lubricant oil
9.2

DISCONNECTION FROM THE PLANT AND SENDING TO OBL FOR MAINTENANCE

BEFORE shipping, always contact OBL customer service and operate as indicated in "Mandatory instruction for returning goods in OBL".
9.3

STORAGE FOR LONG PERIODS

For long term storage (more than 6 months), in addition to those described in "Storage conditions" it is necessary to observe the
following precautions:
Before storage: protect unpainted surfaces with long-term anti-corrosion products
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Verify the conditions about every 6 months. At the first sign of corrosion clean and re-apply anti-corrosion products
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Particular storage conditions should be previously reported, in order to provide a suitable packaging.
9.4

DISPOSAL AND DEMOLITION

The pumps are made of metal and plastic parts.
Page 36
POSSIBLE CAUSE
POSSIBLE CAUSE
POSSIBLE CAUSE
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- Check suction pipeline and tighten the fittings
- Set, and maintain for a short time, pump flowrate to 100% of
adjustment
- Reduce the suction head (suction lift)
- Increase the hydrostatic head on suction side
- Increase the hydrostatic head on suction side
- Change suction pipeline with one of a larger diameter
- Increase the hydrostatic head on suction side
- Make a vent on top of suction tank
- Check suction pipeline and valves
- Check and if necessary clean the filter
- Check the cleaning, wear and proper direction of assembly of pump
valves
- Check if the safety valve opens or not
- Check for any oil leaks
- Check and if necessary correct the adjustment setting
- Increase the discharge pressure at least 0,3÷0,5 bar (3÷5 metres)
respect to the suction pressure
- Verify backpressure valve conditions
- Verify pump valves, dismantle and clean them carefully
- Check electrical connections and motor power consumption
- Install a pressure gauge on the discharge pipeline to verify and
reduce actual pump working pressure
- Reduce the working pressure or install a pulsation damper to
stabilize pressure (avoid the peaks)
- Verify and if necessary correct the pipeline connections to the pump
- Check the discharge pipeline
- Check the backpressure valve
Operating manual
REMEDY
REMEDY
REMEDY
File: UT-4336 – Rev.0