Page 17 - CNG ESP Participant Guide2024

Module 1: Properties and Characteristics of Natural Gas

Lesson 1.5: Safety Hazards of Natural Gas

Hazards of Natural ▪ Pressure – the most serious hazard for CNG
Gas ▪ Fire
▪ Asphyxiation (in concentrations above 7% in air)

NGV Safety Operating Rated Pressure Required Minimum
Features to Address Pressure (MAWP) Safety Burst Pressure
Pressure (Service Pressure) Factor
Components 3,600 psi 5,000 psi 4:1 20,000
Cylinders 3,600 psi 3,600 psi @ 70°F 2.25:1 8,100 psi

NGV Safety ▪ No oxygen in the fuel system (<0.5%)
Features to Address ▪ Higher ignition temperature
Fire ▪ Higher flammability range
▪ Lighter than air

NGV Safety ▪ Simple asphyxiate
Features to Address ▪ Odorant enhances detection
Asphyxiation ▪ Never inhale natural gas in a closed environment

NGV Essentials and Safety Practices (CNG & LNG) © 2024 AFVi All Rights Reserved Page 1-6