Podcast
Questions and Answers
What is the primary function of the F-121 purge air filter?
What is the primary function of the F-121 purge air filter?
To remove particulates from the incoming air.
Describe the purpose of the variable inlet vanes installed upstream of the C-121A/B purge air blowers.
Describe the purpose of the variable inlet vanes installed upstream of the C-121A/B purge air blowers.
The variable inlet vanes restrict airflow to prevent overloading the blower motor.
Explain why it is important to maintain fresh purge air flow to the C-120A/B and C-360A/B motors.
Explain why it is important to maintain fresh purge air flow to the C-120A/B and C-360A/B motors.
Loss of fresh purge air in conjunction with a flammable gas release could result in an explosion and fire.
Under normal operating conditions, how many C-121A/B purge air blowers are typically in service, and what happens to the blower that is not in service?
Under normal operating conditions, how many C-121A/B purge air blowers are typically in service, and what happens to the blower that is not in service?
What is the purpose of the C-121A/B purge air blowers in relation to the electrical classification of the motors they service?
What is the purpose of the C-121A/B purge air blowers in relation to the electrical classification of the motors they service?
Flashcards
Motor Purge System
Motor Purge System
Routes fresh air through an air inlet stack, filtering it for the compressor motors.
F-121 (Purge Air Filter)
F-121 (Purge Air Filter)
Removes particulates from the incoming air in the motor purge system.
C-121A/B (Purge Air Blowers)
C-121A/B (Purge Air Blowers)
Blower assemblies that pass filtered air through compressor motors for safety.
Variable Inlet Vanes
Variable Inlet Vanes
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Local Indicator Light
Local Indicator Light
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Study Notes
- Fresh air travels through a 25’ weatherproof air inlet stack and is filtered by F-121 (Purge Air Filter).
- C-121A/B (Purge Air Blowers) then move the filtered air through C-120A/B and C-360A/B motors.
- A flammable gas release combined with the loss of fresh purge air to C-120A/B and C-360A/B motors could lead to an explosion and fire, with the motors as the ignition source.
F-121 (Purge Air Filter)
- F-121 is a panel containing 24 filters.
- Each filter assembly has a prefilter and a main filter.
- It removes particulates from the incoming air.
C-121A/B (Purge Air Blowers)
- C-121A/B include inlet guard screens, variable inlet vane manual controllers, blower fans, blower motors, and air-actuated discharge valves.
- Variable inlet vanes, located upstream of each blower, limit airflow to prevent motor overload with manual adjustment and locking.
- Each blower uses a 50 HP motor, cooled by surrounding airflow.
- Motor bearings have external grease fittings for lubrication.
- The blowers have variable-pitch blades.
- Normally, only one blower operates at a time.
- The inactive blower's discharge valve is closed to prevent air recirculation.
- Each blower features a hand/off/automatic switch and an indicator light to show its service status.
- Their function is to pass filtered air through C-120A/B and C-360A/B motors.
- This makes the motors intrinsically safe, meeting Class I, Division I electrical classification standards.
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