LP and HP

[cool_hardware52]

Okay, this is something I should know, so I asked it here. What is the actual difference between LP and HP tanks? I don't mean like which can be over filled more or which is better for a certain type of diving. I mean, what makes a tank LP or HP? What are the physics involved? Thanks.

I'm not sure I'd use the term physics, more like materials and design.

Here's a primer: Justia :: 49 C.F.R. §178.37Specification 3AA and 3AAX seamless steel cylinders.

BTW Normalized 4130 has a tensile of about 97KSI, and higher values can be achieved with differing heat treatments that are within the allowable specs.

Tobin