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Questions and Answers
Explain the purpose of the D-730 (Low Pressure Flare K.O. Drum) in the low-pressure flare system and describe its basic operation.
Explain the purpose of the D-730 (Low Pressure Flare K.O. Drum) in the low-pressure flare system and describe its basic operation.
The D-730 removes entrained liquids from low-pressure relief vapors. Vapors enter the top, liquids exit the bottom, and vapors then exit from the top.
Describe the function of E-730 (LP Flare K.O. Drum Plate Coil) and explain why it's important for the operation of the D-730.
Describe the function of E-730 (LP Flare K.O. Drum Plate Coil) and explain why it's important for the operation of the D-730.
E-730 maintains the temperature inside D-730 using 60 psig steam to prevent hydrocarbons from solidifying.
What is the purpose of the P-730A/B (LP Flare K.O. Drum Pumps), and where do they route the liquids from the D-730 and D-740?
What is the purpose of the P-730A/B (LP Flare K.O. Drum Pumps), and where do they route the liquids from the D-730 and D-740?
P-730A/B pump liquid bottoms from the D-730 and D-740 to the Slop Header.
Trace the path of vapors from the D-730 after they exit the top of the drum; what other sources contribute vapors to this path, and what is the ultimate destination of these combined vapors?
Trace the path of vapors from the D-730 after they exit the top of the drum; what other sources contribute vapors to this path, and what is the ultimate destination of these combined vapors?
Explain the role of the Z-101 (Flare Stack) and how it ensures safe disposal of waste gases. What component is critical for initiating the combustion process?
Explain the role of the Z-101 (Flare Stack) and how it ensures safe disposal of waste gases. What component is critical for initiating the combustion process?
Flashcards
Low Pressure Flare System
Low Pressure Flare System
Handles releases below 300 psig and from cold services, directing them to the flare system.
D-730 (Low Pressure Flare K.O. Drum)
D-730 (Low Pressure Flare K.O. Drum)
A vessel (6’D x 18’L) that removes entrained liquids from low-pressure relief vapors before they go to the flare stack.
E-730 (LP Flare K.O. Drum Plate Coil)
E-730 (LP Flare K.O. Drum Plate Coil)
Uses 60 psig steam to maintain the temperature inside D-730, preventing hydrocarbons from solidifying.
P-730A/B (LP Flare K.O. Drum Pumps)
P-730A/B (LP Flare K.O. Drum Pumps)
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Z-101 (Flare Stack)
Z-101 (Flare Stack)
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Study Notes
- The Low Pressure Flare System handles releases less than 300 psig and releases from cold service.
Flow of Releases
- Releases from the Low-Pressure Flare Header and C6+ PSVs go to D-730 (Low Pressure Flare K.O. Drum) in case of overpressure.
- E-730 (LP Flare K.O. Drum Plate Coil) maintains the temperature of D-730 using 60 psig steam to prevent heavy hydrocarbons from solidifying.
- Steam condensate is routed to the 60 psig Steam Condensate Header.
- Liquid bottoms from D-730 and D-740 (Cold Flare K.O. Drum) are routed to the Slop Header by P-730A/B (LP Flare K.O. Drum Pumps).
- Vapors from D-730, D-740, natural gas, and fuel gas from Unit 1092, Unit 1592, and Unit 1191 are routed to M-106 (Flare Seal Drum).
- Liquids from the bottom of M-106 are routed to Unit 1791.
- Vapors from M-106 are routed to Z-101 (Flare Stack).
- Z-101 is equipped with a flare tip and a pilot that is fueled with fuel gas for ignition.
- Waste gas is burned off at Z-101 before release to the atmosphere.
D-730 (Low Pressure Flare K.O. Drum)
- Dimensions: 6’D x 18’L
- Function: Installed to knock out any entrained liquids from the low pressure relief vapors before they are routed to Z-101.
- Low pressure relief vapors enter the top.
- Liquid exits the bottom.
- Vapor exits from the top.
E-730 (LP Flare K.O. Drum Plate Coil)
- Function: Maintains the temperature inside D-730 to prevent hydrocarbons from solidifying, using 60 psig steam as the heating medium.
P-730A/B (LP Flare K.O. Drum Pumps)
- Type: Single-stage centrifugal pumps.
- Motor: Driven by 7.5 HP 3550 RPM horizontally-mounted induction electric motors.
- Function: Route liquid bottoms from D-730 and D-740 to the Slop Header.
M-106 (Flare Seal Drum)
- Dimensions: 8’D x 12’L
- Equipped with a dip leg to prevent oxygen from entering the flare system.
- Water seal maintains a slight positive backpressure on the flare system.
- Overhead vapors from D-730 enter the top.
- Liquid exits the bottom.
- Vapor exits the top side.
Z-101 (Flare Stack)
- Dimensions: 2’6” D
- Function: Burns off waste gas from low-pressure reliefs of less than 300 psig and cold reliefs.
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