NOTE: Disregard the numbers "1.1W1/3," "1.25W1/3," "2W1/3," and so on under the column entitled
"Intermagazine hazard factors and distances (feet) " in Table 5-7 (shown in Figure 2-32 on page 2-24).
These numbers have no bearing on your calculations.
Go down the left side of Table 5-7, under the "Net pounds of explosive" heading, until you find "over
90,000 and not over 100,000." Now go across the top of the table under "Intermagazine hazard factors
and distances (feet)" until you find the hazard factor of 9 that you obtained from Table 5-6. Where the
two columns intersect, you will find the number "510," which means that these two magazines must be
separated by a distance of at least 510 feet.
Summary of Class/Division 1.1 Distance Requirements
Up to this point in the lesson, only class/division 1.1 QD requirements have been covered.
These are summarized as follows:
●
Table 5-4 (shown in Figure 2-26 on page 2-20) is used to determine class/division 1.1 IBDs and
PTR distances.
●
Table 5-5 (shown in Figure 2-29 on page 2-22) is used to determine class/division 1.1 intraline
separations.
●
Table 5-6 (Shown in Figure 2-31 on page 2-23) and Table 5-7 (shown in Figure 2-32 on page
2-24) are used to determine class/division 1.1 intermagazine distances.
REQUIRED DISTANCES FOR CLASS/DIVISION 1.2 ITEMS
Table 5-9 in TM9-1300-206 lists ammunition and explosive items in class/division 1.2 (non-mass-
detonating, fragment-producing items). An extract of Table 5-9 is shown in Figure 2-33.
The QD requirements for class/division 1.2 items are contained in four different tables in TM 9-1300-
206. These tables, which are shown in Figure 2-34, are for use with class/division 1.2 items that are
preceded by fragment-distance designators. Use Table 5-10 for items designated by "(04)," Table 5-11
for items designated by "(08)," Table 5-12 for items designated by "(12)," and Table 5-13 for items
designated by "(18)."
To demonstrate the use of the class/division 1.2 tables, we will use electric primers for artillery rounds
as an example. Assume that you have 100 pounds NEW of such primers and want to find the relevant
IBD, PTR distance, intraline distance, and above-ground magazine distance.
The first step is to find the QD class of electric primers for artillery. Refer to the extract of Table 5-21
shown in Figure 2-35. The class/division of these primers is listed as (04) 1.2.
Now go to Table 5-10 (shown in Figure 2-34 on page 2-27). This table shows that there is no NEW
limit for class/division (04) 1.2 items. The IBD is listed as 400 feet. The PTR distance is listed as 240
feet. The intraline distance is listed as 200 feet. The above-ground magazine distance is listed as 200
feet.
Look at Note 2 under Table 5-10. What this means is that you may reduce the minimum distances by
using Table 5-5 instead of Table 5-10 if the total NEW of HE filler present is less than 1,000 pounds.
Look at the extract of Table 5-5 shown in Figure 2-29 on page 2-22. It shows the minimum
unbarricaded distance as 80 feet for 100 pounds NEW. This distance applies to these primers, even
though Table 5-5 is for class/division 1.1 items and the primers are in class/division 1.2.
2-25
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