I should hang up the phone here because Ferrra and others have made serious efforts to address these questions and reported to SB with their info; but, I'm a softy....Once again, PST attempted to do what you are suggesting, and failed. Their low pressure CM steel technology cannot be scaled up by simply punching some more numbers on the neck of existing designs. Hydro tests do not lie. The company has taken another path in fashioning a tank which shares some of the qualities of LP and HP. Namely, produce a 'LP' tank which can be jacked to higher pressures. Their engineers apparently found that they would have to continue to rely on their high tech 9791 alloy to produce a tank rated to these pressures to avoid making the new tank 8-10 pounds negative, a step backward. One priority, I'm guessing, is to get rid of the multiple standards and sizes and rationalize production. One obvious area is the odd ball 7/8" neck which makes inspection difficult and is irrelevant to the strength of a steel tank and brass valve (at 3500 psi). Also, they now realize that the tort issue of blow out of a standard yoke valve is greatly exaggerated. That is, if someone happens to attach a yoke valve and pump the tank to HP, what is the legal liability if someone claims O ring blowout? Therefore, to comply with existing industry standards, which, BTW, appear to be overconservative, the new tank will probably have a standard 3/4 neck and be rated at 3440 psi, just below the magic number of 3500.
Pesky
