Just cutting the body up higher with the det cord wouldn't likely open the valve, unless the blast pulled on the stem hard enough to strip the valve out as with a base blast.
Blast would probably know better what kinda charge it would take.
Well, the flange bolts at the bottom of the hydrant are designed to easily break away if the hydrant is hit hard, like with a car, a snowplow, or a forklift carrying a pallet of Valvetta cheese...
-Blast, who will say no more.
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