Why are welding shops doing VIPS?
My welding gas place: 1) Does not do VIPs at all, a completely foreign concept to them. They are a reseller for airgas. 2) They are not an authorized retester so their VIPs wouldn't be accepted under the CFRs anyway 3) Gas supply tanks are VIPed on either a 5 or a 10 year schedule, at the time of hydro, they definitely aren't removing those valves annually
Annual visuals are a scuba industry thing (in part because tanks are used while submerged).
I specifically called around about hydros after a couple of buddies and I were able to bulk buy some used tanks. I assume they offer VIPs because they're already "in the tank" and it is more income stream that gels with what they are already doing. Charge $10-$14 (I don't remember), spend a few minutes looking it over good. Easy money. Behind the scenes very few LDS are going to have the machinery for hydros. The three that I have experience with in Houston take scuba tanks to outside hydro testers. None have that ability in house.
Maybe it is an economies of scale thing, and Houston has the scale, but I can get gas, hydros, and VIPs at one shop. To be clear, when I say gas I am talking about gas for my son who does actually weld (professionally in a few months if the gods and the economy don't hate me). I have not bought breathing fills from that shop. But I've also never asked.