Safety Procedures Flashcards
7 cards from real API 510 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Safety Procedures flashcards as text
Under API 510, what is the significance of the term 'positive isolation' in pressure vessel inspection safety?
Answer: Using physical means such as blinds or disconnection to ensure no process fluid can reach the vessel
Positive isolation means using a physical barrier (blind flange, spectacle blind, or spool removal) that cannot leak, unlike valves which may fail.
An API 510 inspection reveals cracks in the vessel shell near a nozzle. The inspector suspects wet H₂S cracking. What immediate safety action should the inspector recommend?
Answer: Remove the vessel from service until the extent of cracking is assessed and fitness-for-service is evaluated
Wet H₂S cracking can cause sudden brittle failure; removal from service and fitness-for-service assessment per API 579 are required before any continued operation.
When an API 510 inspector uses liquid penetrant testing (PT) inside a confined vessel, what ventilation requirement must be addressed?
Answer: Forced ventilation must be provided to prevent solvent vapor accumulation above explosive or IDLH limits
PT penetrant and cleaner solvents are typically flammable and toxic; forced ventilation is required to prevent vapor buildup in confined spaces.
According to API 510 and supporting OSHA standards, who is responsible for certifying that a pressure vessel is safe to enter before an inspector proceeds with internal inspection?
Answer: The owner/operator's authorized person who has confirmed all isolation, atmosphere testing, and permit requirements are met
The owner/operator must designate an authorized person to verify all safety prerequisites—isolation, atmosphere testing, permits—are completed before entry is authorized.
What hazard is specifically associated with opening a manway on a vessel that previously contained hot, heavy crude oil residues?
Answer: Pyrophoric iron sulfide scale that can ignite spontaneously when exposed to air
Crude oil service vessels accumulate iron sulfide scale that is pyrophoric and can ignite spontaneously when the manway is opened and the scale contacts air.
Which of the following best describes the role of the confined space attendant during an API 510 internal vessel inspection?
Answer: Monitoring the entrant's status, maintaining communication, and initiating rescue procedures if needed without entering the space
The attendant must remain outside, maintain continuous communication with entrants, track who is inside, and initiate non-entry rescue without entering the hazardous space.
Under API 510 safety requirements, when must a pressure vessel inspection be stopped and the vessel returned to a safe condition?
Answer: Whenever conditions change to introduce new hazards that exceed the controls established in the original permit
If conditions change—new hazards emerge, permits expire, alarms activate—work must stop and the safe condition must be reestablished before proceeding.