Page 17 - ESP (CNG) Participant Guide

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

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