K2B (two-stage system with HSR4 + LPR5)

Häufige Probleme

• Fouling of turbine and compressor blades from combustion deposits or intake dirt, reducing efficiency and boost pressure
• Bearing wear causing increased rotor vibration or noise on either stage
• Matching issues between the two stages (HSR4 high-pressure, LPR5 low-pressure) after engine derating or a fuel change, causing surge or reduced boost
• Seal wear allowing oil migration into the air or gas path
• Nozzle ring erosion or fouling on the turbine side
• Inter-stage cooler fouling, reducing the efficiency benefit of the two-stage arrangement
• Casing/ducting corrosion on gas-fuelled or HFO applications

Prüfliste

• Check turbocharger rotor axial and radial play against the manufacturer's stated limits
• Inspect compressor and turbine blades for fouling, erosion, or foreign object damage, using a borescope where accessible
• Check bearing lubrication supply pressure/temperature and oil condition
• Measure and trend vibration on both stages
• Inspect the inter-stage cooler for fouling and leakage
• Check for oil leakage at seals into the air or gas side
• Verify boost pressure and exhaust temperature against commissioning baseline data for both stages
• Inspect mounting and ducting for cracking from thermal cycling
• Check operation of the compressor/turbine wash system, where fitted

Wartungsintervalle

Typische Intervalle für diese Bauart, keine Herstellerangabe für Ihr Modell. Verbindlich ist das Handbuch des Herstellers.

Typische Verschleißgrenzen

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

Kritische Ersatzteile

• Bearing set for each stage - the HSR4 and LPR5 units are separate and stock separately
• Seal kit for each stage
• Nozzle ring
• Gasket/O-ring overhaul kit
• Rotor assembly, as a planned major spare or exchange unit where offered

Sicherheit

• High rotor speed - guarding and lockout requirements must be observed during running tests
• Hot casing and ducting surfaces
• Overspeed or surge risk if the two-stage matching is altered without manufacturer approval
• Lifting of rotor and casing components during overhaul - use rated lifting points
• Noise exposure during turbocharger operation and washing

Klassenbesichtigung

Turbochargers of this type are typically covered under the parent engine's continuous machinery survey or planned maintenance scheme rather than surveyed as a standalone item. Overhaul records and any deviation from the manufacturer's recommended overhaul interval should be documented for class credit; where fitted to a gas-fuelled engine, gas-tightness of the turbocharger casing/ducting forms part of the gas-fuel system survey.

Geschätzte Lebensdauer: Major overhaul intervals for two-stage marine turbocharging systems of this type are commonly in the order of 12,000-24,000 running hours, strongly dependent on fuel quality (HFO, gas, or distillate) and load profile - confirm the K2B-specific figure against KBB Turbo's maintenance manual.