(4) Magazine Distance (MD). See Figure 5. This is the minimum distance permitted between any two
storage magazines. MD is determined by the type of magazine and the type and quantity of
explosives stored therein. MD is designed to prevent propagation of explosion from one magazine to
another from the effects of blast, and to provide a reasonable degree of protection from fragments.
Figure 5. Magazine distance
(5) Fragment Distance (FD). The fragment distance for a particular ammunition/explosive item is based
on the range to which a hazardous fragment might be propelled. The following FD criteria apply:
(a)
The fragment must have an impact energy of at least 58 foot-pounds, with an impact density of
one fragment per 600 square feet or less.
(b)
FDs are applicable to class/division 1.1 through 1.3. They are indicated by numbers in
parentheses placed to the left of the class/division designator. For example, (18) 1.1 means
the minimum fragment distance for these items is 1800 feet. Others are: (08) 1.2; and (06)
1.3; as required to indicate the FD in hundreds of feet.
(c)
A minimum distance number shall be used for all items in class 1.2. This corresponds to the
IBD for the various categories within class 1.2.
(d)
For items in class 1.1 and 1.3, the minimum distance number may be used where the
separation distances are greater than specified by applicable QD for debris, fragments and/or
firebrands.
This is to protect personnel in the open, installation boundaries, and
administration/housing areas.
(e)
If a minimum distance number for a cased item (projectile, bomb, etc.) is not known for items in
class 1.1, the minimum distance will be 1250 feet. This will apply for most other bulk
explosives, pyrotechnics and thin-skinned munitions.
(f)
The rationale for using fragment distances less than 1250 feet for class 1.1 will be included in
all ammunition storage site plans and safety reviews. See Chapter 5 of TM 9-1300-206 for
additional information.
MM0150
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