.
A pipe full of dynamite is not a puny bomb.
Yep.
Made my comments based on seeing elbows with two plugs, a short pipe length about 3 inches with caps, and some “T”s with plugs.
They would hurt, produce dangerous frags, but not what I would call a bomb (the Feds would).
I would start ‘bomb’ at about 8 inches of 1 to 1 1/4 inch pipe. (Theoretically speaking, for research purposes.)