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Surging:
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Engr. Shafiul Bari
Shafiul Bari is a seasoned Marine Engineer with extensive experience in ship design, maintenance, and marine propulsion systems. With a deep technical knowledge of ship engineering and a passion for advancing maritime technology, Shafiul shares practical insights and expert advice to help marine professionals and enthusiasts better understand the complexities of ship systems. Through his website, he aims to bridge the gap between technical theory and real-world application, fostering a community of informed and skilled maritime engineers.
When not immersed in ship engines and technical manuals, Shafiul enjoys exploring the latest innovations in marine technology and mentoring aspiring marine engineers.
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.tc surging
- Surging is a phenomenon that affects centrifugal compressor when:
- mass flow rate of air falls below a suitable level at a given pressure ratio.
- Surging is cyclic back flow of air into compressor when there is high resistance to air flow
- It is caused due to periodical breakdown of air delivery from blower
Indications of surging:
- Rapid surge in scavenge air pressure
- Howling Noise
- Alternate Suck-in & push-out at blower intake
- Gulping of air by blower
- Repeated irregular violent thud by blower
- Fluctuating T/C RPM
- Fluctuating Engine RPM
- High Exhaust Temperature
- Black Smoke
Causes of surging:
- Insufficient Engine room ventilation
- Dirty air filter
- Clogging of TC intake silencer
- Dirty blower
- Dirty scavenge air cooler
- Clogging of gas inlet protection grid
- Dirty nozzle ring/turbine
- Wear of TC components (nozzle ring, turbine blades, shroud ring)
- Increased back pressure due to dirty EGE/silencer
- Power imbalance between cylinders
- Unit cut-out & engine running above 40-50% load
- Engine racing
- Hull fouling – causing the engine to run at overload
- Faulty injection/misfiring
- Mismatching engine & T/C
Consequences of surging:
- Vibration
- Bearing damage
- Turbine blade damage
- Rotor damage
Minimizing the possibility of surging:
- Keep the turbocharger intake filter clean.
- Grit -wash the turbine and water wash the compressor side of the turbocharger.
- Efficient maintenance of air-cooling system
- Proper maintenance and checks should be done for different turbocharger parts periodically. If there are any issues, turbocharger repair to be done as soon as possible without loading the engine
- Soot blow should be done from time to time in case of economizer or exhaust boiler
- Indicator cards to be taken to assess the cylinder and power distribution of individual units
- Ensure the engine auxiliaries and parts which affect the turbocharger are maintained properly
- Regular cleaning and inspection of the exhaust manifold
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