Cargo Pump (Deepwell) · Pumps
Naniwa Pump Naniwa DVP 200/60 — Pumps, cargo.
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| Mechanical seal inspection | per the vessel's PMS, commonly annually or at dry dock |
|---|---|
| Line shaft bearing lubrication/renewal | per OEM, often every 2-5 years depending on bearing type (water- or grease-lubricated) |
| Impeller/wear ring clearance check | typically at dry dock or major overhaul, often every 2.5-5 years |
| Performance curve check (flow vs pressure) | typically annual |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Impeller/wear ring radial clearance | typically renewed once clearance opens to roughly double the original design clearance for this pump class, causing a noticeable capacity or head shortfall - the exact figure must be taken from Naniwa's own manual for the DVP 200/60 rather than assumed |
|---|---|
| Line shaft bearing wear | assessed by vibration trend and observed shaft play rather than a fixed number |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Cargo pumps typically fall under Continuous Survey Machinery; class reviews overhaul history, mechanical seal condition and performance test records, with particular attention to pump room gas detection and electrical bonding on tankers carrying flammable cargoes.
Estimated lifetime: Deepwell cargo pumps of this type are commonly operated for 15-20+ years with periodic bearing and seal renewal and occasional impeller/casing overhaul, subject to cargo compatibility and maintenance regime.
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