EXPLANATION OF TERMS - TM-9-1300-2770132

TM 9-1300-277

processing, handling, loading, or assembling

as brisance, detonation rate, cratering B-8 potential,

ammunition and explosives are performed.

steel penetration capability, etc.

Operating Line-A group of buildings, facilities or related

Primer-A device or assembly used to prepare a

work stations so arranged as to permit performance of

demolition charge for firing. It may vary depending on

the consecutive steps in the manufacture of an

the firing system to be employed and in some cases the

explosive, or in the loading, assembly, modification, and

type of charge to be set off.

maintenance of ammunition.

Prohibited Area-A specifically designated area at

Operational Shield-A barrier constructed at a particular

airfields, seadromes, or heliports in which all

location or around a particular machine or operating

ammunition and explosives facilities are prohibited.

station to protect personnel, material, or equipment from

the effect of localized fire or explosion.

Propagating Explosion-Communication of an explosion

(detonation or deflagration) from one explosives source

Outdoor Storage Sites-Sites within the magazine area

to another by fire, fragment, or blast (shock wave) where

selected for outdoor storage of ammunition and in

the time interval between explosions is sufficient to limit

exceptional cases inert items. Outdoor storage sites

the total overpressure at any given time to that which

may be of the following types:

each explosion produced independently. (This condition

where detonation occurs would be evidenced by a

distant shock wave from each detonation with a

a. Earth-revetted, four sides (except entrance),

discernible pressure drop between each explosion.)

located between earth-covered magazines.

Protected Terrain or an effective artificial barrier

interposed between a propellant facility and inhabited

b. Earth-revetted, four sides (except entrance), not

building, or other exposure, to prevent fragments from

located between earth-covered magazines.

endangering the building or other exposure.

c. Nonrevetted, with roof covered magazines.

Protective (Gas) Mask-A face mask used by personnel

to protect the respiratory system against inhalation of

harmful chemical agents.

d. Nonrevetted, without cover, not located between

earth-covered magazines.

Public Highway-Any street, alley, road, or navigable

water open to use of the general public. Navigable

Personnel Shelter--A shelter providing four to six-foot

water is that part of a body of water capable of

thick frontal protection and a minimum of two-foot thick

navigation by barges, tug-boats, or larger vessels.

reinforced overhead protection. Personnel engaged in

Public highway distance is the minimum permitted

demolition operations should always have ample time to

between a public highway and an explosives hazard.

reach shelter which provides splinter-proof protection.

Public highway distances are based on criteria similar to

those applicable to passenger railroads and are identical

Photoflash Devices-Photographic aids, such as mag-

to passenger railroad distances. Persons in the open

nesium flashlights, photoflash bulbs, and electronic flash

are considered safe from the blast effects (not

attachments. Only lighting equipment bearing the label

fragments) of explosions when separated from the

of approval of the Underwriters' Laboratories for the

explosion site by distance equal to one-half the public

hazard involved will be used in photographing locations

highway distance.

involving exposed explosives, explosive dusts,

flammable gases or vapors.

Public Railway-Any steam, electric, or other railroad

which carries passengers for hire.

Public railway

Power-In relation to explosives, the term refers to

distance is the minimum permitted between a public

relative end results. It takes into account such factors

railway as so defined and an explosives hazard.

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