EXPLANATION OF TERMS - TM-9-1300-2770133

TM 9-1300-277

The distance at which cars are considered safe from the

Rocket-A complete missile which derives its thrust from

blast effects of explosions has been fixed at 60 percent

ejection of hot gases generated from propellants in the

of the inhabited-building distance. These decreased

motor.

distances are used in tables for class 1.1 materials. The

use of the lesser distances is based on the smaller

Safety Distances-Safety distances are empirical dis-

height and area of railroad cars exposed to blast; the

tances in relation to quantity of explosives, and are the

greater resistance of cars to blast as compared with

minimum permitted for separation of facilities within a

buildings; and the fact that, while a building is stationary

hazard area, of possible explosions of the explosive

and subject to risk constantly, the presence of a train is

hazard from inhabited buildings, public railway, and

only temporary. For other than class 1.1 materials,

public highways, in order to control the magnitude of

inhabited-building distances are required to public

damage, loss of life, and serious injuries. Separation

railways. The minimum separation between privately

distances are not absolutely safe distances but are

owned railways over which passengers are not carried,

relatively protective or safe distances.

Greater

and magazines and storage sites will be not less than

distances than those shown in the applicable tables

400 feet unless the public railway distance specified in

should be used whenever practicable.

the appropriate quantity-distance table is less.

However, the railways must be separated by public

Semifixed Ammunition -Ammunition loaded into the

railway distances from operating buildings.

weapon as a unit. The cartridge case is loose-fitted

over the base of the projectile so that the propelling

Public Traffic Route-Any public street, road, highway,

charge may be adjusted for zone firing.

navigable stream, or passenger railroad.

Separate-Loading

Ammunition-Ammunition

whose

Pyrotechnic Material-Explosive or chemical ingredients,

major components projectile, propelling charge and

including powdered metals, used in manufacture of

primer are issued unassembled and are loaded into the

military pyrotechnics.

weapon separately.

Quantity-Distance-The quantity of explosives material

Separated-Loading Ammunition-Ammunition consisting

and the distance separation relationships which provide

of a projectile and a primed cartridge case containing

defined types of protection. These relationships are

propellant. The propelling charge is not adjustable for

based on levels of risk considered acceptable for the

zone firing.

stipulated exposures and are tabulated in the

appropriate quantity-distance tables.

Service Magazine-Auxiliary building used for inte-

rmediate storage of explosives materials not exceeding

Rail Holding Yard-A railroad yard used for storing of

the minimum amount necessary for safe, efficient

loaded cars for indefinite periods of time.

production.

Restricted Area-Any area, usually fenced, at an

Simultaneous Detonation-Detonation of separated

establishment where entrance and egress of personnel

quantities of explosives or ammunition occurring so

and vehicular traffic are controlled for reasons of safety

nearly at the same time that the effect on the

and security.

surroundings is the same as though the several

quantities were not separated and were detonated en

Revetment-An explosives location barricaded on at least

masse.

three sides. The revetment may or may not incorporate

Single-Revetted Barricades-A mound which has been

a structure or an overhead cover.

modified on one side by a retaining wall, preferably of

Riot Control Agent-A chemical that produces temporary,

concrete, of such slope and thickness as to hold firmly in

irritating, or disabling effects when in contact with the

place the 3-foot width of earth required at the top, with

eyes or when inhaled.

the earth at the natural angle on one side. All other

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