Emergency Procedures and Response Flashcards
7 cards from real CNG practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Emergency Procedures and Response flashcards as text
If a CNG fuel dispenser shows an unexplained pressure spike during a fueling operation, the operator should:
Answer: Stop fueling immediately and notify a supervisor
Unexplained pressure anomalies may indicate equipment malfunction or system failure; stopping fueling and notifying a supervisor prevents a potential incident.
If a fire breaks out at a CNG compressor at a fueling station, the FIRST action should be:
Answer: Activate the emergency shutdown system and evacuate all personnel
The emergency shutdown (ESD) system cuts all gas flow and electrical power simultaneously; evacuation protects personnel while the system mitigates the hazard.
The primary combined hazard when entering a confined space where CNG may be present is:
Answer: Oxygen-deficient atmosphere and potentially explosive gas concentration
CNG displaces oxygen in confined spaces creating asphyxiation risk, and accumulated gas within the 5–15% range creates an explosive atmosphere.
A CNG fueling station should be evacuated immediately when:
Answer: A gas odor is detected anywhere on the premises
Gas odor indicates an active leak that could reach a flammable concentration; immediate evacuation removes personnel and eliminates potential ignition sources.
Which type of communication device should NOT be used near an active CNG leak site?
Answer: Standard non-rated portable radios or consumer cell phones
Standard radios and cell phones can produce electrical arcs or sparks that may ignite a flammable gas-air mixture.
After a CNG incident at a fueling station is controlled, fueling operations may resume only after:
Answer: A qualified inspector certifies the system is safe and all documentation is complete
Qualified inspection ensures all systems are structurally sound and safe, while documentation creates a required record of the incident before operations resume.
The emergency shutdown (ESD) system at a CNG fueling station is designed to:
Answer: Simultaneously cut all natural gas flow and electrical power to prevent fire spread
The ESD system simultaneously isolates the gas supply and de-energizes electrical systems, eliminating both fuel and ignition sources in a single action.