b'Appendix DAppendix DNatural Gas Escaping Inside a BuildingPOTENTIAL HAZARDSFIRE OR EXPLOSION EXTREMELY FLAMMABLE Will be easily ignited by heat, sparks or flames.Will form explosive mixtures with air Vapors from liquefied gas are initially heavier than air and spread along ground.CAUTION: Natural Gas / Methane (UN1971) is lighter than air and will rise. Natural Gas/ Methane (UN1971) fires are difficult to detect since they burn with an invisible flame.Use an alternate method of detection (thermal camera, broom, etc.) Vapors may travel to source of ignition and flash back Cylinders exposed to fire may vent and release flammable gas through pressure relief devices. Containers may explode when heated Ruptured cylinders may rocketHEALTHVapors may cause dizziness or asphyxiation without warning Some may be irritating if inhaled at high concentrations Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire may produce irritating and/or toxic gases. PUBLIC SAFETYApproach cautiouslyEstablish an effective and safe perimeter.Position apparatus out of danger zone (avoid front of building and over manhole coversand sewers).Keep unauthorized personnel away.Secure the scene and deny entry.35 2022 by Pipeline Association for Public Awareness'