KSB RPH 100/150
KSB Pumps. KSB is a long-standing partner to the shipping industry with comprehensive product range for all marine applications (cargo ships, LNG tankers, dredgers, passenger vessels). The Etanorm (world market leader, standardized centrifugal pump per EN 733) is suitable for seawater applications. The Movitec is a multi-stage high-pressure inline pump with excellent
Inspector Detail
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Common issues
- Mechanical seal leakage or premature failure from dry-running or misalignment
- Impeller wear/erosion reducing head and flow
- Cavitation from insufficient NPSH available, especially on stripping duty
- Bearing wear from misalignment or lubrication neglect
- Casing wear ring clearance increase causing internal recirculation losses
- Shaft sleeve wear at the seal/packing area
Inspection checklist
- Check discharge pressure/flow against the pump curve for performance degradation
- Vibration monitoring at bearings
- Mechanical seal leakage inspection
- Coupling alignment check
- Wear ring clearance measurement at overhaul
- NPSH margin check against system conditions
- Bearing temperature trend monitoring
Service intervals
| Mechanical seal inspection/replacement | typically every 8,000-12,000 h or on leakage |
| Bearing lubrication/replacement | per maker schedule, commonly every 8,000 h (grease) or annually |
| Wear ring/impeller clearance check | at major overhaul, typically every 3-5 years |
| Alignment check | after any coupling-disturbing maintenance, and annually |
Typical wear limits
| Wear ring radial clearance | typically renewed once clearance opens to roughly double the as-new value, often in the range 0.3-0.6 mm depending on pump size - confirm against KSB's clearance table for this model |
| Impeller vane erosion | judged by measurable thinning/pitting at inspection rather than a single numeric limit - confirm against KSB overhaul criteria |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Mechanical seal (matching type/size)
- Impeller
- Wear rings
- Shaft sleeve
- Bearings
Safety
- Cargo pump service may involve flammable or toxic cargoes - seal integrity is critical to prevent leakage into the pump room
- Isolate and depressurise before opening the casing
- Static bonding/earthing required where flammable cargo is handled
Class survey
Cargo pumps are typically covered by periodic performance and leakage checks under the ship's planned maintenance system; class surveys commonly review pump room gas detection and seal condition records where flammable cargoes are carried.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Visual inspection of seal housing and shaft for drip traces or moisture; pressure testing with manometer to detect pressure drops; soap solution for bubble formation and leak location; control of scavenge system for blockages (overheating causes premature wear). Monitor leak rate: mechanical seal normal <0.006 l/h
Measure bearing temperature and compare with manufacturer specifications; check vibration and smooth running of pump and motor; check lubricant supply and exchange intervals; inspect elastic transmission elements (coupling bolts, discs, packages) for wear; control coupling alignment. Coupling replacement recommended in case of wear
Visual-mechanical inspection for wear of sealing rings and impeller wear protection; check for wear of shaft keyways and bearing seats; clearance inspection (<1 µm normal value for seals); check wear ring material (hard-chromed or nitrided for abrasive media >800-1000 HV surface hardness). Replace damaged or worn parts with genuine spare parts
Compare NPSH value of system (NPSHA) against required pump NPSH (NPSHR) from data sheet; NPSHA must be >= NPSHR over entire operating range; monitor pump smooth running and operating noise (cavitation noise = rough operating noise); perform pressure test bench tests to simulate cavitation conditions; check suction conditions and system design; visually inspect housing and impeller for pitting and surface erosion
Inspect piping and fittings for wear, corrosion and functionality; test pump control and switching function; check electronic monitoring systems; inspect general housing corrosion and bearing contamination traces; perform surface cleaning (DO NOT flush, instead apply protective grease); document all inspection results
Type-general inspection and maintenance points for this equipment category — not model-specific.
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