Operation; Running Tests; Maintenance; Repairing The Pump - DAB SMC6 Instrucciones Para La Instalación Y El Mantenimiento

If necessary, partially close gate valve or adjust the intervention of pressure switches.
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The system should be fully completed before starting the pump, especially for what concerns electrical, mechanical and hydraulical
components. All safety systems must be correctly operating. The pump cannot run for more than 3 minutes with the gate valve closed
to avoid overheating of the unit.

8.2 Operation

The max. number of possible startups / hour depends from motor power and starter type.
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Up to 100 Hp = 10 startups / hour
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100/200 Hp = 8 startups / hour
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above 200 Hp = 5 startups / hour
If the pump does not start, avoid insisting without having before investigated the reason. All motors can afford ÷ 5% voltage deviation
from rated voltage values.

8.3 Running tests

In case of pump misfunctioning, perform the following tests to find out the probable reasons:
FIRST TEST
– Close fully the gate valve,
Note at startup the AMPS absorbed,
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Note during operation,
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Note pressure as reported by the pressure gauge on delivery,
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Note vertical distance between water level and the gauge dial center.
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The following cases are possible:
Same pressure, same AMPS obsorbed:
– If the gauge readings do not differ substantially from previous readings, the impellers are not worn and motor rotation is correct.
– If the AMPS absorber did not change from the original readings, the pump and motor internal rubbing did not increase and the percentage of
water suspended sand is not representing a problem for the pump.
Lower pressure:
– Lower pressure means worn impellers, or too low main voltage.
Higher AMPS absorbed:
– This usually indicates a strong rubbing by the bearing journals due to suspended solids.
SECOND TEST
Open completely the gate valve,
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Note the AMPS absorbed,
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The following case is possible:
Pump delivery lower than rated delivery. This can depend from scaling, from a clogged upstream valve or from leaks along the pipe line.
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9.

MAINTENANCE

Periodical maintenance is strictly related to the percentage of water suspended sand.
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No maintenance is necessary as long as the pump keeps running efficiently, i.e. pump delivery keeps above 50% of rated delivery or
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the AMPS absorbed do not exceeds the 5% allowance).
In some cases it will be necessary to replace worn parts such as impellers, sealing rings or bearings.
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In case of an high sand percentage, we suggest a first inspection after a 1000 running hours.
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– During long idle periods in the well, the pump / motor groups should be shortly started every 2 or 3 months.
Making sure the group is still fully submersed.
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10. REPAIRING THE PUMP

10.1 Disassembling the pump / motor group

Because of its construction features, the pump and motor group easily disassembled and re-assembled with normal metric size shop tools.
If the pump adopts a non return valve, consider the additional weight of the water-filled column besides the group weight and use
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therefore a suited hoist.
– We suggest to employ specialized personnel for assembling and disassembling.

10.2 Assembling the pump / motor group

Check the free rotation of pump and motor rotating parts, paying attention not to damage them.
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– The axial joint between pump shaft and motor shaft should be installed without forcing. Absolutely avoid kicking the shaft, as that could
damage the thrust bearing.
The pump-motor coupling should be done perfectly, a wrong alignment will unavoidably cause motor bearing failure and vibrations.
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– The pump joints are provided with screws to lock the rotating part axially. The coupling screw for 10" - 12" - 14" motors should be strongly
locked on the motor key.
When coupling 6" - 8" motors, the coupling screw shall be aligned to the hole located on the motor shaft; after locking, the screw must
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be unscrewed half turn and locked in this position by a sealing product (loctite or similar) or in a mechanical position positive way
(calking), paying attention not to damage the screw thread. The locking of the screw on the shaft could cause an eccentrical
rotation of the rotating part and consequently damage the bearings.

11. DECOMMISSIONING AND DISMANTLEMENT

When the pump will be permanently stopped and dismantled, the various materials composing it should be properly disposed of. It is important to
make sure that no residual polluting liquids are trapped within the pump.
ENGLISH
Note pressure as reported by the pressure gauge,
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Note pump delivery as reported by the flow meter.
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