Safety & Handling Procedures Flashcards
7 cards from real CPA 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 & Handling Procedures flashcards as text
Which type of respirator is required when working in an atmosphere with oxygen levels below 19.5%?
Answer: Self-contained breathing apparatus (SCBA) or supplied-air respirator
Air-purifying respirators cannot add oxygen; only SCBA or supplied-air units provide breathable air in oxygen-deficient environments.
The lower explosive limit (LEL) of a petroleum vapor mixture represents:
Answer: The minimum vapor concentration in air at which the mixture can ignite
Below the LEL, there is insufficient fuel vapor mixed with air to support combustion; above the upper explosive limit (UEL), the mixture is too rich to ignite.
How should a petroleum apprentice respond upon discovering an uncontrolled fuel leak from a pressurized pipeline?
Answer: Evacuate the area, eliminate ignition sources, and notify emergency response immediately
Pressurized fuel leaks create immediate explosion and fire hazards; evacuation and emergency notification must take priority over any repair attempt.
Petroleum workers are trained to recognize H₂S (hydrogen sulfide) gas primarily because:
Answer: It is a colorless, extremely toxic gas that causes rapid incapacitation at high concentrations
H₂S is lethal at concentrations above 300 ppm and can desensitize the sense of smell at high levels, making detection by odor alone unreliable.
When connecting a grounding cable before a petroleum product transfer, the cable should be attached to the receiving vessel:
Answer: Before opening any valves or initiating product flow
Grounding must be established before flow begins because static charge builds from the very first moment product moves through the system.
Which of the following PPE items is specifically required when sampling petroleum products from an open tank hatch?
Answer: Chemical splash goggles, chemical-resistant gloves, and appropriate respiratory protection
Open tank hatches expose workers to vapors and potential splashing, requiring eye, skin, and respiratory protection simultaneously.
A Material Safety Data Sheet (now called SDS) must be accessible to employees:
Answer: At all times during their work shift without barriers or delays
OSHA's Hazard Communication Standard requires SDS documents to be immediately accessible to workers in their work area at all times.