Q. PHMSA cylinder questions
How do I get approval for a gas cylinder?
How does my company get approved to be a DOY cylinder inspector?
How do I get my cylinder re-qualified?
The Pipeline and Hazardous Materials Safety Administration has a page devoted to Approvals at http://www.phmsa.dot.gov/hazmat/regs/sp-a/approvals
The specific guidelines for getting a cylinder approved is located at: http://www.phmsa.dot.gov/hazmat/regs/sp-a/approvals/cylinders