Which option correctly states the required separation for buried mortars relative to the wall of troughs or drums?

Which option correctly states the required separation for buried mortars relative to the wall of troughs or drums?

• A. 3 inches
• B. 1 inch
• C. 2 inches
• D. 4 inches

Answer: (C)

The key idea is to maintain a minimum clearance between buried mortars and the wall of the trough or drum to control heat and blast effects. A small buffer keeps the hot mortar and any fragments from directly contacting or transferring heat to the metal wall, reducing the risk of damage or secondary ignition. Two inches is the specified minimum because it provides enough space for heat dissipation and safe clearance without overdoing the layout. If the gap were smaller, heat and fragments could reach the wall; if it were larger, it wouldn’t add extra safety but would waste space. So the required separation is two inches.

The key idea is to maintain a minimum clearance between buried mortars and the wall of the trough or drum to control heat and blast effects. A small buffer keeps the hot mortar and any fragments from directly contacting or transferring heat to the metal wall, reducing the risk of damage or secondary ignition. Two inches is the specified minimum because it provides enough space for heat dissipation and safe clearance without overdoing the layout. If the gap were smaller, heat and fragments could reach the wall; if it were larger, it wouldn’t add extra safety but would waste space. So the required separation is two inches.