EXPLANATION OF TERMS - TM-9-1300-2770130

TM 9-1300-277

Inhabited Building Distance-Inhabited building distances

ground being warmer than the surrounding air). This

are the minimum distances which may be expected to

condition is usually found when skies are clear, between

protect buildings or structures from substantial structural

the hours of 1000 and 1600. During such conditions,

damage (not readily repairable) from blast effect. These

strong convection currents may exist. An unstable

distances do not provide protection against glass

atmospheric condition such as described is favorable for

breakage, but do provide a high degree of protection

disposal of chemical agents for tactical purposes.

from fragments.

Liquid Propellants-Substances used for propulsion or

Intermagazine Distance-The minimum distance permit-

operation of missiles, rockets, or related devices.

ted between explosives locations, as prescribed for

various types and quantities of explosives.

This

Loading Docks-Facilities at ground level or elevated

distance is expected to prevent propagation by blast

structures designed and installed for transferring

(shock wave) and to provide a reasonable degree of

ammunition, explosives, and component parts thereof,

protection against propagation due to fragments.

to or from automotive vehicles, railway cars, and/or

cargo-type aircraft.

Intraline Distance-The minimum permitted (except as

Magazine-Any building or structure, except an operating

indicated below) between any two buildings within any

building, used for storage of ammunition explosives or

one operating line. Intraline distances are also used for

loaded ammunition components. Includes such facilities

separating certain specified areas and locations within

as an above-ground magazine, an igloo-type magazine,

explosives establishments even though actual

a railroad car, a motor truck, a temporary shelter, or an

operations are not involved.

Intraline distance is

open storage site.

expected to protect from propagation of explosion due

to blast effects, but not against possibility of propagation

Magazine Area-A specifically designated area set aside

due to fragments. Buildings separated by intraline

distances will probably suffer substantial structural

for the primary purpose of ammunition and explosives

damage.

storage.

Intraline Operations-Processes accomplished within one

Magazine Distance-This distance is the minimum

operating line.

permitted between any two storage magazines.

Distance required is determined by the type or types of

magazines and also the type and the quantity of

Intraline Separations-The distance to be maintained

ammunition or explosives from one magazine to another

between any two operating buildings and/or sites within

from blast and provides a reasonable degree of

an operating line, at least one of which contains or is

protection against propagation of explosion due to

designed to contain explosives.

fragments. It does not, except perhaps for earth

covered magazines, protect the magazines from severe

Inversion Condition-An increase of air temperature

structural damage.

resulting from an increase in altitude (the ground being

cooler than the surrounding air). This condition is

Magazine, Earth-Covered, Non-standard All Earth-

usually found on clear or partially-clear nights and early

in the morning to about one hour after sunrise. There

covered magazines except Army igloo, Navy arch-type,

will be no convection currents and little mechanical

earth-covered, corrugated steel, arch-type, and module,

turbulence with winds less than six miles per hour. A

open storage, barricaded with earth covering equal to or

stable atmospheric condition such as described is

greater than that required by standard igloo magazines.

favorable for releasing chemical agents for tactical

Malfunction-Failure of item to function in accordance

purposes, but it is the most unfavorable condition for

disposal purposes.

with its expected performance or functioning of the

explosive components during a non-functional test.

Lapse Condition-The condition in which a decrease of

air temperature results from an increase in altitude (the

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