System Maintenance & Troubleshooting Flashcards

A filter housing gasket is found to be compressed and deformed during inspection. What is the primary risk if the gasket is not replaced?

Answer: Air bypass around the filter, reducing filtration effectiveness

A deformed gasket cannot create an airtight seal, allowing unfiltered air to bypass the filter media and enter the downstream system.

Which tool is most appropriate for field-testing HEPA filter integrity after installation?

Answer: Aerosol photometer with challenge aerosol

An aerosol photometer used with a challenge aerosol (such as DOP or PAO) is the standard instrument for scanning and verifying HEPA filter integrity.

A technician observes that pre-filters are loading much faster than expected. What operational change would most effectively extend pre-filter service life?

Answer: Investigate and control the upstream dust source

Addressing the upstream dust source reduces the contaminant burden on pre-filters, directly extending their service life.

During a maintenance shutdown, a technician finds the final filter frame bent and warped. What is the recommended course of action?

Answer: Replace the filter with a new unit to ensure proper seating

A bent or warped frame prevents uniform seating against the housing, creating potential bypass pathways that compromise filtration.

What is the significance of recording filter differential pressure readings at consistent airflow conditions during each maintenance visit?

Answer: It enables accurate comparison of filter loading between visits

Consistent airflow conditions ensure differential pressure readings are comparable between visits, allowing accurate tracking of filter loading trends.

A pulse-jet cleaned cartridge filter fails to clean properly and differential pressure keeps rising. What component is most likely malfunctioning?

Answer: Pulse valve or compressed air supply to the cleaning system

Pulse-jet cleaning depends on properly functioning pulse valves and adequate compressed air supply; failure of either prevents effective cake removal.

Which condition indicates that a V-bank filter configuration is operating at or near its end-of-life?

Answer: Differential pressure has reached the manufacturer's final resistance rating

Reaching the manufacturer's specified final resistance rating indicates the filter has loaded to its designed capacity and must be replaced.