Naniwa DVP 200/60
Naniwa Pump Naniwa DVP 200/60 — Pumps, cargo.
Inspector Detail
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Common issues
- Mechanical seal wear or leakage at the pump top
- Line shaft bearing wear along the deepwell column
- Impeller wear or erosion reducing capacity
- Foot valve or strainer blockage affecting suction
- Drive coupling issues at the top drive unit
- Cavitation during tank stripping from insufficient available NPSH
Inspection checklist
- Mechanical seal leakage check at the pump top
- Line shaft bearing clearance and vibration check
- Impeller and wear ring clearance at overhaul
- Discharge pressure/flow trend versus the design performance curve
- Drive unit condition (hydraulic or electric, per the installed type)
- Foot valve and strainer condition
- Cargo tank stripping performance check
- Coupling alignment
Service intervals
| 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 wear limits
| 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.
Critical spares
- Mechanical seal kit
- Line shaft bearing set (bottom and intermediate)
- Impeller
- Wear rings
- Coupling elements
Safety
- Cargo pump room/pump stack is a hazardous area for flammable or toxic cargo vapours
- Static electricity discharge risk during pumping operations
- Entanglement hazard at line shaft couplings
- Hot work restrictions apply near cargo lines and pump rooms
Class survey
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.
Components & Design
Component data being added…
Technical Data
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