A175-L 175-L37

Typowe problemy

• Bearing wear (journal and thrust bearings), leading to excessive axial/radial play and vibration.
• Compressor fouling due to oil carry-over or dirty intake air, reducing efficiency and air flow.
• Turbine fouling/erosion from combustion by-products (soot, unburnt fuel) or abrasive particles, impacting performance and potentially causing imbalance.
• Nozzle ring and diffuser damage (cracks, deformation, erosion) affecting gas flow and turbine efficiency.
• Oil leakage from bearing housings (e.g., due to worn labyrinth seals or improper sealing air pressure), contaminating exhaust gas or intake air.
• Rotor imbalance causing excessive vibration, often due to fouling, blade damage, or bearing issues.
• Surging, indicated by unstable operation, pressure fluctuations, and characteristic 'whooshing' sounds, often due to insufficient air demand or severe fouling.
• Exhaust gas casing cracks or leaks, particularly around the turbine outlet or expansion joints, posing safety and performance risks.

Lista kontrolna przeglądu

• Check bearing axial and radial play (if accessible or during planned opening) against manufacturer's limits. Listen for abnormal bearing noise during operation.
• Inspect compressor impeller and casing for fouling, erosion, and foreign object damage (FOD). Verify effectiveness of water washing system.
• Inspect turbine wheel and nozzle ring for fouling, erosion, cracks, and foreign object damage. Check for proper operation of water washing system.
• Verify integrity of the oil lubrication system: check oil pressure, temperature, filter condition, and for any external leaks from bearing housings or oil lines.
• Examine air filter elements for cleanliness and damage. Ensure proper sealing of the air intake system.
• Inspect exhaust gas casing, gas inlet/outlet ducts, and expansion joints for cracks, hot spots, and gas leaks.
• Monitor turbocharger speed, boost pressure, and exhaust gas temperatures (inlet/outlet) against engine load and baseline values. Look for deviations.
• Check vibration levels using onboard monitoring systems or portable equipment. Investigate any readings exceeding alarm limits.
• Verify proper functioning of the sealing air system, including pressure and flow, to prevent oil ingress into gas paths.

Interwały serwisowe

Typowe granice zużycia

Zakresy są typowe dla tej klasy konstrukcyjnej. Decydujące są zawsze dokumenty producenta dla danego numeru seryjnego.

Krytyczne części zamienne

• Complete bearing set (journal and thrust bearings) with associated O-rings/gaskets.
• Labyrinth seals (compressor and turbine side) and sealing air system components.
• Full set of O-rings and gaskets for bearing housing, gas casing, and oil lines for overhaul.
• Oil filter elements for the turbocharger's dedicated lubrication system (if applicable).
• Nozzle ring segments or a complete nozzle ring (depending on design and common failure modes).
• Speed sensor (magnetic pick-up) and associated cabling.
• Water washing nozzles and associated seals.

Bezpieczeństwo

• High surface temperatures of the exhaust gas casing (up to 400-550°C) requiring proper insulation and caution during inspection/maintenance.
• Extremely high rotational speeds (e.g., 8,000 - 15,000 RPM for a unit of this size), posing a severe risk of rotor burst if overspeed protection fails or structural integrity is compromised.
• Pressurized systems (exhaust gas, boost air, lubrication oil, sealing air) requiring depressurization before opening any covers or lines.
• Risk of hot oil or exhaust gas spray during maintenance if systems are not properly isolated and drained.
• High noise levels in the vicinity of the turbocharger, necessitating hearing protection during operation and inspection.

Przegląd klasyfikacyjny

Class surveyors will typically focus on the overall condition and cleanliness of the turbocharger, verifying that it is free from excessive vibration, oil leaks, and exhaust gas leaks. They will check the integrity of the exhaust gas casing and insulation. If the turbocharger is opened for maintenance, bearing clearances (axial and radial play) will be measured and recorded. The functionality of safety devices, particularly the overspeed trip mechanism and associated alarms, will be confirmed. Maintenance records, running hours, and performance logs (boost pressure, exhaust temperatures) will be reviewed to ensure adherence to manufacturer's recommendations and good operating practice. Any signs of surging or unstable operation will be investigated.

Szacowana trwałość: 100,000 - 150,000 running hours for major components (rotor shaft, main casings) with regular maintenance and replacement of wear parts.