Q.Is My Cactus A Blue Torch?
I’ve had this cactus for about three years but I’m still unsure what species it is. It was unlabeled when I bought it. I love it very much and would like to know how tall it will grow. It is currently 15.5 inches tall including spines. I would appreciate any help on identifying it :).

Certified GKH Gardening Expert
It is, probably, within that section... Yes. The entire genus is undergoing reclassification, so we may see this group split even further!
For now, this will be considered within the broad genus, Echinopsis.
http://www.phytoimages.siu.edu/taxpage/0/genus/Echinopsis.html