Perhaps I have **** luck, but it seems the vast majority of shops I deal, or have dealt with, use partial pressure blending. On that note, have not had tanks with O2 stickers refused to be filled. So, tanks are cleaned each season, and affixed with O2 compatible stickers. All part of the scuba experience.
Consider all the shops worldwide that use partial pressure blending - how often does one blow up? How often do they blow as a result of a contaminated privately owned cylinder? Perhaps one every few seasons? Remember one two seasons ago in South Alabama (aka FL Panhandle) - seem to recall that was a banked tank, not scuba tank. Have not read of a dirty, or contaminated tank causing one of these explosions (not to say it hasn't happened). Most incidents with scuba cylinders seem to be caused by defective tanks or valves. Lots of variables involved, from the fill station, whip, the individual gas blender to the cylinder.
Don't misunderstand, high concentrations of oxygen in tanks can be dangerous. It's hazardous regardless of how it go in the tank.
Consider all the shops worldwide that use partial pressure blending - how often does one blow up? How often do they blow as a result of a contaminated privately owned cylinder? Perhaps one every few seasons? Remember one two seasons ago in South Alabama (aka FL Panhandle) - seem to recall that was a banked tank, not scuba tank. Have not read of a dirty, or contaminated tank causing one of these explosions (not to say it hasn't happened). Most incidents with scuba cylinders seem to be caused by defective tanks or valves. Lots of variables involved, from the fill station, whip, the individual gas blender to the cylinder.
Don't misunderstand, high concentrations of oxygen in tanks can be dangerous. It's hazardous regardless of how it go in the tank.