How is NFPA 704 rating calculated?
The picture below shows NFPA rating criteria and a typical NFPA 704 label. Different colors represent different types of hazards. A number rating system of 0-4 is provided to rate each of the four hazards and is placed on a placard. 0 represents the least hazardous while 4 represent the most hazardous.
What hazard class is anhydrous ammonia?
Non-Flammable Gas
Anhydrous Ammonia: (SDS) Safety Data Sheet
| HAZARD CLASS: | (US Domestic): 2.2 (Non-Flammable Gas. 49 CFR 173.115) |
|---|---|
| PROPER SHIPPING DESCRIPTION: | UN1005, Ammonia, Anhydrous |
| LABEL / PLACARD: | (US Domestic): 2.2, Non-Flammable Gas |
| IDENTIFICATION NUMBER: | UN 1005 |
Is anhydrous ammonia hazardous?
Hazard Description Ammonia is an irritant and corrosive to the skin, eyes, respiratory tract and mucous membranes. Exposure to liquid or rapidly expanding gases may cause severe chemical burns and frostbite to the eyes, lungs and skin. Skin and respiratory related diseases could be aggravated by exposure.
What is SA on NFPA 704?
SA indicates the material is a simple asphyxiant gas. Examples of simple asphyxiants include nitrogen, argon, helium, and carbon dioxide. *Fueling stations that handle only motor vehicle fuels stored in underground storage tanks are exempt from NFPA 704 posting.
Where can I find NFPA 704 safety ratings?
(health, flammability, instability, and special hazard information such as oxidizers, water reactivity, or simple asphyxiant gases.) The best source for the NFPA 704 ratings of a material is the Material Safety Data Sheet (MSDS), which can be obtained from the supplier of the material.
What do NFPA 704 hazardous materials identification system placards do?
These placards act as an immediate warning system for emergency service personnel, addressing health, flammability, instability, and special hazards that may be present, acute exposures that are most likely to occur as a result of fire, spill, or similar emergencies. NFPA 704 Hazardous Materials Identification System
Why is the NFPA 704 diamond system important?
The NFPA 704 diamond system is intended to provide basic information to fire fighting, emergency and other personnel. This standard provides a readily recognized, easily understood system for identifying specific hazards and their severity using spatial, visual, and numerical methods to describe in simple terms the relative hazards of a material.
How are hazards coded in the NFPA system?
In addition to the spatial orientation that can be used to distinguish the hazards, they are also color‐coded as follows: blue for health, red for flammability, and yellow for instability. The shades of red, blue and yellow are not regulated, but should be contrasting colors.