Safety Systems & Standards Flashcards
7 cards from real CPT 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 Systems & Standards flashcards as text
What is the Lower Flammable Limit (LFL) of a gas or vapor?
Answer: The minimum concentration of a combustible gas in air below which ignition will not occur
The Lower Flammable Limit (LFL) is the minimum concentration of a combustible substance in air below which the mixture is too lean to propagate a flame.
Which document formally authorizes a worker to perform a specific non-routine or hazardous task in a process facility?
Answer: A work permit or permit-to-work (PTW)
A permit-to-work (PTW) is a formal authorization document that specifies the hazards, precautions, and controls required before a non-routine or hazardous task may begin.
What does 'SIL 2' mean in the context of safety instrumented systems per IEC 61511?
Answer: A Safety Integrity Level indicating a risk reduction factor of 100 to 1,000
SIL 2 per IEC 61511 corresponds to a probability of failure on demand (PFD) between 0.001 and 0.01, representing a risk reduction factor of 100 to 1,000.
In confined space entry, what is the primary role of an 'attendant' (hole watch)?
Answer: To monitor conditions and entrants from outside and initiate rescue if necessary
The attendant remains outside the confined space, monitors the entrant and atmospheric conditions, and initiates emergency rescue procedures if hazardous conditions develop.
What is the purpose of a bowtie analysis in process risk management?
Answer: To visually represent the relationship between hazard causes, the top event, and potential consequences along with barriers
A bowtie diagram visually maps threats that lead to a top event on the left side and consequences on the right, with barriers shown on both sides to illustrate risk controls.
According to OSHA 29 CFR 1910.119 (PSM), which of the following is a covered highly hazardous chemical threshold trigger?
Answer: Chemicals listed in Appendix A at or above their threshold quantities (TQs)
OSHA PSM coverage is triggered when Appendix A listed chemicals are present at or above their specific threshold quantities (TQs) at a process facility.
What is 'inherently safer design' as a process safety strategy?
Answer: Eliminating or reducing hazards at the source by changing the process chemistry, conditions, or quantities rather than controlling them
Inherently safer design eliminates or minimizes hazards at the source through substitution, minimization, moderation, or simplification rather than relying on added protective layers.