Torpedo Sand Torpedo Sand KennyRogers (Structural) (OP) 25 May 17 18:37 I am not sure if my thread was deleted, but I was inquiring about torpedo sand. Why is it called that? And what are the general definitions that would define a torpedo sand? RE: Torpedo Sand jgKRI (Mechanical) 25 May 17 19:45 'Torpedo Sand' is a relatively fine aggregate, which is screened at 3/8" and conforms to ASTM C33. I have no idea why they call it that. RE: Torpedo Sand concretemasonry (Structural) 26 May 17 02:12 ASTM C33 specifications cover a wide range of different "sands". Because of this wide range, there are many localized terms to describe a certain type of natural sand. In my experience "torpedo" sand is usually quite clean and a little coarser than other sands, but still within the ASTM C33 gradation limits. Dick Engineer and international traveler interested in construction techniques, problems and proper design.