Facility and Ventilation Requirements 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 Facility and Ventilation Requirements flashcards as text
What is the maximum allowable height for a CNG dispensing unit installed inside an enclosed fueling facility?
Answer: Height is not restricted, only ventilation around the unit is regulated
NFPA 52 does not restrict dispenser height but mandates proper ventilation around the unit to disperse any releases safely.
Which of the following materials is NOT acceptable for the construction of a CNG compressor room wall that separates it from an occupied area?
Answer: Unprotected wood-frame construction
Unprotected wood-frame construction does not provide the required fire resistance rating needed to separate a hazardous compressor room from occupied spaces.
According to NFPA 52, what must be posted at the entrance to an enclosed CNG vehicle storage facility?
Answer: A sign prohibiting smoking and open flames
Signs prohibiting smoking and open flames must be conspicuously posted at all entrances to reduce ignition risk in the hazardous environment.
What action is required before performing hot work (welding, grinding) inside a CNG facility?
Answer: Obtain a written hot work permit and verify gas-free conditions
A hot work permit system requires documenting gas-free verification and safety precautions before any ignition-capable work begins in the facility.
What is the recommended action if the CNG facility ventilation system fails during fueling operations?
Answer: Immediately cease fueling operations and shut off gas supply
Ventilation failure removes the primary safeguard against gas accumulation, so fueling must stop immediately and the gas supply must be shut off until the system is restored.
How must penetrations through a fire-rated wall in a CNG compressor building be treated?
Answer: Sealed with listed fire-stop materials to maintain the wall rating
All penetrations through fire-rated assemblies must be sealed with listed firestop systems to preserve the intended fire resistance of the separation.
Which of the following is an acceptable alternative to mechanical ventilation in a small CNG storage room of less than 1,000 cubic feet?
Answer: Permanent gravity ventilation openings totaling at least 2% of the floor area at both high and low locations
Small rooms may use natural gravity ventilation with permanent openings of at least 2% of floor area at both high and low levels as an alternative to mechanical systems.