Podcast
Questions and Answers
What is the primary purpose of the plant oil system?
What is the primary purpose of the plant oil system?
How is the oil temperature controlled before startup?
How is the oil temperature controlled before startup?
What feature is included in the oil tank to monitor oil levels?
What feature is included in the oil tank to monitor oil levels?
What is the function of the oil centrifuge in the system?
What is the function of the oil centrifuge in the system?
Signup and view all the answers
What type of pumps are used in the oil system?
What type of pumps are used in the oil system?
Signup and view all the answers
At what pressure is the common pump delivery manifold maintained?
At what pressure is the common pump delivery manifold maintained?
Signup and view all the answers
What happens when oil pressure drops low in the system?
What happens when oil pressure drops low in the system?
Signup and view all the answers
What role do the oil coolers play in the plant oil system?
What role do the oil coolers play in the plant oil system?
Signup and view all the answers
When should the lube oil filter be changed over?
When should the lube oil filter be changed over?
Signup and view all the answers
What is the primary purpose of the vent system in the lube oil filters and coolers?
What is the primary purpose of the vent system in the lube oil filters and coolers?
Signup and view all the answers
What happens when the lube oil pressure falls in the emergency oil tank?
What happens when the lube oil pressure falls in the emergency oil tank?
Signup and view all the answers
What is indicated by the pressure switch with a low-low alarm?
What is indicated by the pressure switch with a low-low alarm?
Signup and view all the answers
How is the lube oil distributed after it passes through the filter?
How is the lube oil distributed after it passes through the filter?
Signup and view all the answers
Which component is kept full by the regular flow from the main oil tank during normal operation?
Which component is kept full by the regular flow from the main oil tank during normal operation?
Signup and view all the answers
What mechanism ensures that oil does not overflow during normal functioning of the emergency oil tank?
What mechanism ensures that oil does not overflow during normal functioning of the emergency oil tank?
Signup and view all the answers
What is the purpose of the restriction orifices in the flow to the journal bearings?
What is the purpose of the restriction orifices in the flow to the journal bearings?
Signup and view all the answers
Study Notes
Plant Oil System Overview
- The oil system lubricates compressor bearings, controls steam turbine operations, and manages hydraulic devices.
- Maintains oil temperature and pressure while supplying oil to plant equipment.
- Equipped with two electrical heaters in the oil tank for startup warmth, controlled thermally, and features a high-temperature alarm.
- Contains two level legs: one with a sight glass and the other with a low-level alarm for monitoring oil levels.
- A local temperature indicator is present on the tank itself.
- The tank has a sloping base directing fluid toward pump suction lines, and the lowest point connects to an oil centrifuge for moisture and dirt separation.
- Features two electrically driven positive displacement pumps; typically, one is online while the other remains on standby.
- Standby pump activates automatically if oil pressure drops too low.
- A third, steam-driven positive displacement pump is available for use during total power failure.
Lubrication and Control Oil Systems
- Pressure in the pump delivery manifold maintained at 934 kPa via a control valve returning oil to the tank.
- Control system pressure is set at 850 kPa and connects through a 2″ takeoff from the 6″ delivery manifold.
- Lubrication oil line reduces pressure to 350 kPa through a 4″ takeoff with a pressure control valve; primarily used for compressor bearing lubrication.
- Lubrication oil passes through two shell-and-tube coolers, utilizing cooling water through the tubes, with oil on the shell side.
Oil Coolers and Filter Systems
- Each cooler and filter equipped with vent valves linked to 1″ drain lines for oil return, with sight glasses for visibility.
- Vent system prevents pressure drops during cooler or filter changes.
- Pressure controller tapping point located after filters, along with two local pressure indicators and a low-low alarm to trip the compressor.
- Lubrication oil supply branches to eight journal bearings, steam turbine thrust bearings, compressor gear couplings, barring gear, and emergency oil tank.
- Flow to journal bearings includes restriction orifices and is monitored with seven pressure gauges, while coupling flow is unrestricted.
Emergency Oil Tank
- Emergency oil tank is positioned outside on the building’s south side, stores sufficient oil for bearing lubrication in power outages.
- Tank remains filled via reverse flow through a non-return valve that opens as lube oil pressure decreases.
- Excess oil from the emergency tank can overflow back into the main oil tank during normal operations.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
This quiz covers the key components and functions of the plant oil system, including its role in lubricating compressor bearings and controlling turbine operations. Learn about how the oil system maintains temperature and pressure, as well as safety features like alarms and heaters. Test your understanding of this essential system in plant operations.
