Pentair SCM 4 PLUS 75/75 Bedienungs- Und Wartungsanleitung Seite 15

EN
USE AND MAINTENANCE MANUAL
Before installing the hydraulic unit inside the well, it is necessary to remove all the sand, in accordance with the
ordinary procedures adopted for perforators.
SCM 4 PLUS® pumps should never be used without pumping liquid, because the bearings are lubricated by the liquid
itself. The pump can suffer severe damage if it is operated in dry conditions, even for short interval of time. The
unit has to be positioned on the bottom of the well and slightly raised by approximately 1-2 m, to prevent the sand
surrounding the motor and the pump and overheating the former and wearing the rotating parts of the latter.
Before lowering the pump into the well, make sure that the supply cable have been correctly tightened to the fittings
on the control panel and that the protection relays are suited to the absorption indicated on the nameplate. At this
point, disconnect the unit and start lowering it into the well. All lowering operations should be performed using
stainless steel or nylon ropes and the slots provided on the head of the pump. Connect the first pipe section to the
drain mouth of the pump after fixing the two halves of the supporting rod to the end of the pipe. If threaded pipes
are provided, apply the threaded sleeve to the upper end to avoid it sliding between the pipe and the rod. Use a hoist
to lower the whole unit into the well. Carefully control the free end of the cable to prevent it falling into the well.
Connect the second section of the pipe, that is coupled to the upper supporting rod, remove the previous rod and
lower the whole unit into the well. Repeat this operation until the desired project depth has been reached. Take into
account that the machine must be positioned at 1-2 m below the dynamic level or, at any rate, at a depth that meets
the pump NPSH. Before positioning the pump, it is necessary to take into account the lowering of the water level,
that can originate from seasonal factors or from an excessive stratum extraction. The well level should never fall
below the suction chamber to avoid gripping the guide bushings and overheating the motor. The power cable should
be fixed with straps every 2-3 m of pipe. Cables should be safely anchored to the riser to prevent lowering caused by
weight. These movements could cause deformations owed to the striking against the walls of the well and ruptures
of the cables.
If the riser is formed by threaded tube sections, it is necessary to tighten the latter to prevent them coming loose
due to the machine reaction torque.
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