Page 246 - Handbook of Hazardous Chemical Properties

236 LIQUEFIED NATURAL GAS

Fire Hazards -Flash Point (deg. F): 180 - 285 OC; Flammable Limits in Air (%): Data not available;
Fire Extinguishing Agents: Alcohol foam, dry chemical, or carbon dioxide; Fire Extinguishing Agents
Not To Be Used: Water or foam may cause frothing; Special Hazards of Combustion Products: Not
pertinent; Behavior in Fire: Not pertinent; Ignition Temperature : Data not available; Electrical
Hazard: Not pertinent; Burning Rate: Data not available.
Chemical Reactivity - Reactivity with Water: No reaction; Reactivity with Common Materials: No
reaction; Stability During Transport: Stable; Neutralizing Agentsfor Acids and Caustics: Not pertinent;
Polymerization: Not pertinent; Inhibitor of Polymerization: Not pertinent.

LIQUEFIED NATURAL GAS
Chemical Designations - Synonym: LNG; Chemical Fonnula: CH,+C,&.
Observable Characteristics - Physical State (as shipped): Liquefied gas; Color: Colorless; Odor:
Mild, sweet.
Physical and Chemical Properties - Physical State at I5 rand I atm: Gas; Molecular Weight: > 16;
Boiling Point at I am: -258, -161, 112; Freezing Point: -296, -182,2, 91,O; Critical Temperature: -
116, -82,2, 191,O; Critical Pressure @ia, arm, MN/m2): 613,45,18,4,64; Specific Gravity: 0,415-
0,45 at -162°C (liquid); Vapor (Gas) Specific Gravity: 0,55-l,O; Ratio of Specific Heats of Vapor
(Gas): 1,306; Latent Heat of Vaporization: (est.) 220, 120, 5,l; Heat of Combustion: -21,600 to -
23,400, -12,000 to -13,000, -502,4 to 544,3; Heat ofDecomposition: Not pertinent.
Health Hazards - Personal Protective Equipment: Self-contained breathing apparatus; protective
clothing if exposed to liquid. Symptoms Following Exposure: If concentration of gas in high enough,
may cause asphyxiation. No detectable systemic effects, even at 5 % concentration in air. Treatma for
Exposure: Remove victim to open air. If the is overcome by gas, apply artificial resuscitation. Toxicity
by Inhalation (Threshold Limit Value): Data not available; Short-Tern Inhalation Limits: Data not
available; Toxicity by Ingestion: Not pertinent; Late Toxicity: None; Vapor (Gas) Irritant
Characteristics: Vapors are nonirritating to the eyes and throat. Liquid or Solid Irritant Characteristics:
No appreciable hazard. Practically harmless to the skin because it is very volatile and evaporates
quickly. May cause some frostbite. Odor Threshold: Data not available.
Fire Hazards - Flash Point : Flammable gas; Flammable Limits in Air (96): 5.3 - 14.0; Fire
Extinguishing Agents: Do not extinguish large spill fires. Allow to burn while cooling adjacent
equipment with water spray. Shut off leak if possible. Extinguish small fires with dry chemicals; Fire
Extinguishing Agents Not To Be Used: Water; Special Hazards of Combustion Products: Not pertinent;
Behavior in Fire: Not pertinent; Ignition Temperature (deg. F): 999; Electrical Hazard: Class I, Group
D; Burning Rate: 12.5 mmlmin.
Chemical Reactivity - Reactivity with Water: No reaction; Reactivity with Common Materials: No
reaction; Stability During Transport: Stable; Neutralizing Agents for Acids and Caustics: Not pertinent;
Polymerization: Not pertinent; Inhibitor of Polymeriz&*on: Not pertinent.

LIQUEFIED PETROLEUM GAS
Chemical Designations - Synonym: Bottled gas; Propane-butane-(propylene) Pyrofax; LPG chemical
Formula: C,H,-C,H8-C4H,,.
Observable Characteristics - Physical State (as shipped) : Liquefied compressed gas; Color: Colorless;
Odor: Mild. But commercial LPG has a skunk-like odorant added as a warning.
Physical and Chemical Properties - Physical State at 15 “c and 1 am.: Gas; Molecular Weight:
>44; Boiling Point at 1 atm.: >-40, >-40, >233; Freezing Point: Not pertinent; Critical
Temperature: -142.01, -96.67,176.53; Critical Pressure: 616.5,41.94,4.249; Specific Gravity: 0.51-
0.58 at -50 “C (liquid); Vapor (Gas) Specijic Gravity: 1.5; Ratio of Specific Heats of Vapor (Gas):
-
1.130; Latent Heat of vaporization: 183.2, 101.8, 4.262; Heat of Combustion: -19,182, -10,990,
460.13; Heat of Decomposition: Not pertinent.
Health Hazards Information -Recommended Personal Protective Equipment: Self-contained breathing
apparatus for high concentrations of gas; Symptoms Following Exposure: Concentrations in air greater
than 10% cause dizziness in a few minutes. 1% concentrations give the same symptom in 10 min. High