SNH Series

Häufige Probleme

• Reduced volumetric efficiency from worn screw sets or increased internal clearances
• Mechanical seal leakage from wear, misalignment, or dry running
• Bearing wear/noise from insufficient lubrication or misalignment
• Cavitation from a blocked suction strainer or insufficient NPSH
• Coupling misalignment causing vibration and premature bearing/seal wear
• Overheating from running against a closed discharge or a malfunctioning relief valve

Prüfliste

• Check discharge pressure and flow against the pump curve/nameplate rating
• Inspect the mechanical seal for leakage
• Check coupling alignment
• Inspect and clean the suction strainer
• Verify relief valve setting and function
• Check bearing temperature and vibration
• Inspect screw set clearances at scheduled overhaul
• Check noise level for cavitation or bearing distress indicators

Wartungsintervalle

Typische Verschleißgrenzen

Die Bereiche sind für diese Bauklasse typisch. Maßgeblich sind stets die Herstellerunterlagen zur jeweiligen Seriennummer.

Kritische Ersatzteile

• Mechanical seal kit
• Screw set (power rotor and idler rotors) matching the fitted size
• Bearing set
• Coupling element/insert
• Relief valve spring/seat kit
• Gasket and O-ring set

Sicherheit

• Running against a closed valve without a functioning relief valve can cause overpressure or case rupture
• Hot lube oil discharge - burn risk from seal or casing leaks
• Rotating shaft/coupling guard must be in place before operation
• Pressurized system - isolate and depressurize before opening the casing or seal housing

Klassenbesichtigung

Class surveys typically confirm relief valve function test records and, where the pump serves an essential service such as main engine lube oil, verify standby pump availability and changeover arrangements per the vessel's approved machinery arrangement.

Geschätzte Lebensdauer: Triple-screw lube oil pumps of this type typically run 20,000-30,000+ hours between major overhauls given clean oil and proper alignment, with a long overall service life given periodic screw-set renewal