MASS FIRE HAZARD MATERIALS (CLASS 1, DIVISION 3).- Items in this division burn vigorously. There is little or no possibility for extinguishing them in a storage situation. Normally, explosions will be confined to pressure ruptures of containers and will not produce propagating shock waves or damaging blast overpressure beyond specified distances. A severe fire may result from the tossing about of burning container materials, propellant, or other flaming debris. Toxic effects, such as burning pyrotechnic items, will not normally extend beyond the inhabited building distances specified for this division.

MODERATE FIRE HAZARD, NO BLAST MATERIALS (CLASS 1, DIVISION 4).- Items in this division present a fire hazard with no blast hazard and virtually no fragmentation or toxic hazard beyond the fire hazard clearance specified for high-risk materials. However, separate facilities for storage and handling of this division should not be less than 100 feet from other facilities. However, if the facilities are of fire-resistive construction, they may be 50 feet from each other. If devices containing explosives are such that accidental ignition during storage or transport will not cause external damage to the devices, either by fire, smoke, heat, loud noise, or by visible damage to the outer packaging, they are not considered Class 1 items. These devices may be considered inert for storage purposes and marked AMMUNITION NON-EXPLOSIVE for transport purposes.

Certain articles within the division that contain one ounce or less of explosives have (based on test results) been classified as Class 1, Division 4S. These articles may be considered inert for storage purposes, and they are not subject to explosive transportation regulations. Articles containing larger quantities of explosives, also classified as Class 1, Division 4S, may be considered inert for storage purposes. However, they must be reviewed on an individual basis to determine whether explosive transportation regulations are applicable.

VERY INSENSITIVE EXPLOSIVE ITEM MATERIALS (CLASS 1, DIVISION 5).- Items in this division are considered very insensitive when not stored or transported with other Class 1 materials. DOD considers these items to be the same as Class 1, Division 1, Compatibility Group D. There is very little probability of accidental explosion or transition from deflagration to detonation. The materials within this division are shipped as Q-D Hazard Class 1, Division 5. They are stored as Class 1, Division 1, Compatibility Group D.

Normally, technical manuals do not present the hazard class, division, and compatibility group as they are written in previous paragraphs. For example, an item classified as Class 1, Division 5, Compatibility Group D, is written as Class 1.5D; or for an item in Class 1, Division 4, Compatibility Group S is written as Class 1.4S.

Figure 12-1 shows Q-D information about Class 1.1 items. As you read this paragraph, refer to figure 12-1. Col 1 and Col 2 list the minimum and maximum

Figure 12-1.-Quantity-distance requirements for Class 1, division 1 items (example).

(respectively) net explosive weight to be stowed. For example, if you are stowing Class 1 Division 1 explosives with a net explosive weight of 13,000 pounds, you find the minimum net explosive weight in Col 1 (10,000 pounds) and the maximum net explosive weight in Col 2 (15,000 pounds); then, read horizontally across the page to obtain the distance requirements. Columns 3, 4, and 5 list the minimum distance, in feet, from the storage site (in this case a standard earth-covered magazine) to an inhabited building. If the net explosive weight is 13,000 pounds, the minimum distance from the front or side of the magazine to the closest inhabited building is 865 feet (Col 3). The minimum distance from the rear of the magazine to an inhabited building is 615 feet (Col 4). The minimum distance from the magazine to other potential explosive sites (PES) is 900 feet. Columns 6, 7, and 8 list the minimum distance, in feet, from the magazine to public traffic routes. It is read in the same manner as Columns 3, 4, and 5.

The Q-D hazard requirements do not apply to ammunition and explosives while in transit. Ammunition and explosives in transit are regulated by the Department of Transportation (DOT). The Q-D hazard classifications do not necessarily mean that all ammunition and explosives within a classification can be stowed in the same magazine. All ammunition and explosives listed as Class 1, Division 1 explosives may not be compatible when stowed together. For example, assembled HE rockets and GP bombs are classified as Class 1, Division 1 explosives, but they aren't compatible when stored together. NAVSEA OP 5, volume 2, contains a listing, by DOD Q-D hazard class, of naval ammunition and explosives.