NSA - Close Coupled Self-Priming Pump
DESMI NSA - Close Coupled Self-Priming Pump — Seawater and freshwater cooling, ballast/bilge pumps, emergency fire service.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Inspect for leakage at pump shaft seal gland; check for weeping, dripping, or active seawater intrusion. Monitor salt crystallization or corrosion deposits around seal area.
Monitor pump discharge pressure/flow vs. design curve; listen for cavitation noise (grinding/crackling); inspect impeller for erosion pitting or blade surface damage during overhaul.
For seawater cooling: inspect bronze/duplex stainless steel casing and impeller for pitting, crevice corrosion, or galvanic attack. Check sacrificial anode condition if installed. Verify material compatibility with sea chest chemistry.
Monitor bearing temperature (infrared or touch), audible noise, and vibration signature. Inspect bearing housings for oil leakage, discoloration, or thermal stress. Verify lubrication level and condition at shaft/impeller bearings.
Check all flange connections (sea chest suction, discharge overboard, cooler inlet/outlet) for active leaks, gasket weeping, or joint movement. Verify bolt torque on international standard flanges per flange rating (DN-dependent).
Type-general inspection and maintenance points for this equipment category — not model-specific.
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