The interstack distance is the minimum distance allowable between the closest edges of the nearest stacks in an
FSU. The inter-FSU distance is the minimum distance allowable between the closest edges of the nearest stacks
in adjacent FSUs. The intercategory distance is the minimum distance allowable from an FSU of one category to
the nearest FSU of another category.
QD requirements for field storage are based on the gross weight of the round (including packaging), not on the net
explosive weight (NEW). Figure 4 contains an extract from TM 9-1300-206, Table 4-4, showing the QD
requirements for the different categories of munitions. The following is an example of how to use this table to
determine the number of stacks and FSUs you will need to identify on your layout plan.
The stock control section has received the storage activity stockage list from the Corps Material Management
Center. It has determined that the gross tons of Category A ammunition to be stored will be 920. According to
the table, the maximum amount of Category A ammunition per stack is 20 tons. Divide 920 tons by 20 tons per
stack to obtain the number of stacks needed. The result is 46 stacks. Only one type of ammunition is normally
stored in a stack, so additional stacks may be required to separate different types of ammunition. Also, Table 4-4
shows that the maximum gross tons per FSU for Category A ammunition is 400 tons. (See Figure 4.) Therefore,
three FSUs are needed to store 920 tons of Category A ammunition.
The FSUs must be 300 feet apart, and, if each stack contains 20 tons, there must be 50 feet between every
unbarricaded stack. As you can see, a large amount of real estate is needed for a storage activity.