How many divisions of Class 1 explosives are there?
(b) Explosives in Class 1 are divided into six divisions as follows: (1) Division 1.1 consists of explosives that have a mass explosion hazard.
Class 1 consists of six 'divisions', that describes the potential hazard posed by the explosive. The division number is the second number after the decimal point on a placard.
- Trinitrotoluene (TNT) and mixtures.
- Trinitrobenzene and mixtures.
- Ammonium picrate.
- Ammunition.
- Dipicryl sulfide.
- Hexotonal.
Division 1.1: Substances and articles which have a mass explosion hazard. Division 1.2: Substances and articles which have a projection hazard but not a mass explosion hazard. Division 1.3: Substances and articles which have a fire hazard and either a minor blast hazard or a minor projection hazard or both.
There are two different divisions that exist in Class I, Division 1 and Division 2, along with three Zones; Zone 0, 1 & 2. Locations that would be considered to be Class I include Petroleum Refineries, Gasoline Storage Areas, Dry Cleaning Plants, Spray Finishing Areas, Fuel Servicing Areas, etc.
For example, a Class I Division 1 fixture is designed to contain an explosion within the fixture should the internal components start one. External heat from the environment or location where the light is located will not cause an explosion nor will the light's housing allow a spark or arc to start an ignition.
Class I, Division 1 classified locations. An area where ignitable concentrations of flammable gases, vapors or liquids can exist all of the time or some of the time under normal operating conditions. A Class I, Division 1 area encompasses the combination of Zone 0 and Zone 1 areas.
To summarize. Class 1 Hazardous Locations refer to facilities that deal with flammable gases, vapors, and liquids. Division 2 specifies that flammable materials are handled, processed, or used at a location.
Hazard Class 1: Class 1 hazards are explosives or any devices or chemicals that are designed to explode or combust. Class 1 explosives are illustrated by an orange placard with their designated hazard class, division number or compatibility letter displayed at the bottom. Some also feature an explosion graphic.
Class I Locations A “Class I Location” is created by the presence of flammable gases or vapors in the air in sufficient quantities to be explosive or ignitable. When these materials are found in the atmosphere, a potential for explosion exists if an electrical or other source of ignition is present.
Are fireworks Class 1 explosives?
Consumer fireworks are considered hazardous materials (hazmat) Division 1.4G explosives, and their safe transport is regulated by the Hazardous Materials Regulations (HMR) (see 49 Code of Federal Regulations (CFR) Parts 171-180).
explosive, any substance or device that can be made to produce a volume of rapidly expanding gas in an extremely brief period. There are three fundamental types: mechanical, nuclear, and chemical.
Division defines the likelihood of the hazardous material being present in an explosive or ignitable concentration. Class I flammable gases and vapors are grouped into one of four groups (Groups A, B, C or D) based on their physical properties and the ease in which they can be ignited.
Class I locations are those in which inflammable gases or vapors are or may be present in sufficient quantities to produce explosive or flammable mixtures. Class I, Division 1 locations are where hazardous atmosphere may be present during normal operations.
| Class 1 | Explosives |
|---|---|
| Division 1.1 | Explosives with a mass explosion hazard |
| Division 1.2 | Explosives with a projection hazard |
| Division 1.3 | Explosives with predominantly a fire hazard |
| Division 1.4 | Explosives with no significant blast hazard |
Class Definition
Class I locations are those in which flammable vapors and gases may be present. Class II locations are those in which combustible dust may be found. Class III locations are those which are hazardous because of the presence of easily ignitable fibers or flyings.
Division 1 products are protected by “intrinsically safe” technique. Hazard Isolation: This technique involves separating potential ignition sources from the explosive atmosphere. By pressurizing electrical equipment, for example, flammable gases are unable to enter enclosures in which electrical devices are located.
Dangerous goods are firstly assigned to one of nine hazard classes, known as UN classes, according to their primary hazard.
D2 schools differ from D1 schools in that they are usually slightly smaller universities. Compared to D1 and D3, D2 has the fewest number of schools with only about 300 colleges. Their programs still cover a variety of sports, however, and D2 schools compete against regional rivals instead of national competitors.
- Graduate high school.
- Earn a core course GPA of 2.3 or higher.
- Complete 16 core courses. ...
- You must complete 10 of the core courses by the end of your junior year (before the start of your seventh semester). ...
- Earn an SAT combined score or ACT sum score matching your core-course GPA on the Division 1 sliding scale.
Is a Class 1 Div 2 motor explosion-proof?
While Division 1 motors in Class I locations must be explosion-proof, Class II, Division 1 motors must be dust- ignition-proof. The characteristics of dust-ignition-proof motors differ from those of their Class I counterparts.
Class 2 has three divisions: Flammable (also called combustible), Non-Flammable/Non-Poisonous, and Poisonous.
Seals are required for each run of conduit entering or leaving a Class I, Zone 2 location. Seals may be either inside or outside of the hazardous area but they must be at the first joint in the conduit.
Zone 0: Explosive atmosphere for more than 1000h/yr. Zone 1: Explosive atmosphere for more than 10, but less than 1000 h/yr. Zone 2: Explosive atmosphere for less than 10h/yr, but still sufficiently likely as to require controls over ignition sources.
- 2.1 Flammable Gas – Hydrogen Compressed, Ethylene, Butylene, Acetylene, etc.
- 2.2 Non-Flammable Gas – Oxygen Compressed, Nitrogen Compressed, etc.
- 2.3 Poisonous Gas – Phosgene, Sulfur Tetrafluoride, Insecticide Gasses, etc.
Division 1.4 consists of explosives that present a minor blast hazard. Examples are common fireworks, toy caps, empty primed grenades, and some small arms ammunition.
Class 2 hazards are compressed gases, which are divided into four categories: flammable/combustible gases, non-flammable/non-poisonous gases, toxic/poisonous gases, and oxygen.
UN classifies explosives as Class 1 materials. Under Class 1 there are six divisions: Division 1.1 Substances and articles which have a mass explosion hazard. Division 1.2 Substances and articles which have a projection hazard but not a mass explosion hazard.
CLASS 1 Explosives
* For Divisions 1.1, 1.2, or 1.3, enter division number and compatibility group letter, when required; placard any quantity.
Class 1 - Explosives
Explosives are materials or items which have the ability to rapidly conflagrate or detonate as a consequence of chemical reaction. DGI are proficient in handling explosives, Class 1 Dangerous Goods.
What are 3 high explosives?
- (a) High explosives (for example, dynamite, flash powders, and bulk salutes);
- (b) Low explosives (for example, black powder, safety fuses, igniters, igniter cords, fuse lighters, and “display fireworks”, except for bulk salutes); and.
The term “explosives” shall include all material which is classified as Class A, Class B, and Class C explosives by the U.S. Department of Transportation, and includes, but is not limited to dynamite, black powder, pellet powders, initiating explosives, blasting caps, electric blasting caps, safety fuse, fuse lighters, ...
(1) Division 1.1 consists of explosives that have a mass explosion hazard. A mass explosion is one which affects almost the entire load instantaneously. (2) Division 1.2 consists of explosives that have a projection hazard but not a mass explosion hazard.
Some of the classes can be further divided into divisions, e.g., Class 1, while others do not have sub-divisions, e.g., Class 3.
The definitive reference is the National Electrical Code Chapter 5. Class I locations are ones in which hazardous vapors may or do exist. The difference between Div 1 and Div 2 is the level of expectation that hazardous levels will be present. Note that Classes are given a Roman numeral and Divisions an Arabic numeral.
A good example of the difference here might be a paint booth: inside a paint booth, normal operation is DEFINED as volatile liquid (paint) being discharged into the atmosphere in a spray of fine droplets – hence, that would be Class I, Div 1.
Gunpowder, certain fireworks and rocket fuel are easily recognizable examples of Division 1.1 Explosives. Likewise, trinitrotoluene (better known as “TNT”) is an example that is commonly utilized in a number of industries for its explosive properties.
There are three fundamental types: mechanical, nuclear, and chemical.
Class I Locations: Are those in which flammable gases or vapors are or may be present in the air in quantities sufficient to produce explosive or ignitable mixtures. Class II Locations: Are those which are hazardous due to the presence of combustible dust.
Division defines the likelihood of the hazardous material being present in an explosive or ignitable concentration. Class I flammable gases and vapors are grouped into one of four groups (Groups A, B, C or D) based on their physical properties and the ease in which they can be ignited.
What is a Class 1 Division 2?
Class I, Division 2 locations are those in which volatile flammable liquids or gases are handled, processed or used. Normally they will be confined within closed containers or in closed systems from which they can escape only in the case of rupture or deterioration of the containers or systems.
The purpose of assigning compatibility groups is to prohibit their proximity to each other in transport and storage incidental to transport. 6. In the context of explosives, the term “compatibility” is a synonym for segregation within Class 1.
The main difference between Class 1 Div 1 and Class 1 Div 2 locations is the lower likelihood of flammable substances being present in Class 1 Div 2 environments. Despite the lower risk, safety precautions and specialized equipment are still necessary to prevent accidents and protect workers in these areas.