Submersible Pump · Pumps
Grindex Magnum L / N / H — Drainage - Ultra heavy duty.
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| Seal chamber oil check/change | commonly every 1000-2000 running hours or per the maker's schedule, more frequent in heavy sediment duty |
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| Insulation resistance test | at each planned inspection and after any submersion incident or trip |
| Impeller/wear plate inspection | condition-based, commonly every few hundred hours in abrasive sediment service |
| Bearing overhaul | at the maker's major service interval |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Impeller running clearance | renewed once clearance has opened up meaningfully beyond the maker's new-build tolerance - confirm the actual figure against Grindex's service manual for the Magnum range rather than assuming a fixed value |
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| Solids passage | rated at 12 mm as supplied; repeated clogging on debris smaller than that is a sign the effective clearance has changed and warrants inspection |
| Seal chamber oil condition | any water content or discolouration in the barrier oil is treated as the practical seal-wear limit, independent of running hours |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Where used within a class-required bilge or drainage arrangement, function testing (start/stop, alarm response, and where practical a capacity check) is typically required at surveys; portable emergency drainage pumps may need a periodic capacity demonstration.
Estimated lifetime: No fixed running-hour life is meaningful here - service life is governed mainly by seal and impeller condition; well-maintained units in this heavy-duty drainage class commonly remain in service for many years between major overhauls.
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