Nitrogen Cylinders Set Q A

SET 1
Q1: Do you have photos showing the cylinder DOT specifications, service pressure, and other identification markings? A1: Under 49 CFR Part 180
DOT3AA 2400 (this is what is shows in the picture) that 2400 represents a 2400 psi service pressure. For DOT3AA cylinders, the required hydrostatic test pressure is:5/3 × service pressure Service pressure = 2400 psiTest pressure = 2400 × (5/3) = 4000 psi

Q2: What size are the cylinders (water capacity or cubic feet, and dimensions if available)?

A2: 9.25’X 55” (NIIN 012105594)

Q3: Are all 528 the same size?
A3: Yes, they are all the same size.
Q4: PWS 5.3 says cylinders must be charged "(min - max psi)" but no values are listed. What are the minimum and maximum fill pressures? A4: If a contractor is certified to hydrostatically test and starstamp cylinders, they should already know how to determine these pressures because the full process and required values are laid out in CGA G10.1 and CGA C1. CGA C1 explains how to determine the hydrostatic test pressure, which for steel cylinders is normally 5/3 × the stamped service pressure. The maximum fill pressure is the cylinder’s service pressure as marked (for example, a DOT3AA2400 cylinder has a max fill of 2400 psi). The minimum pressure is simply any pressure below that, typically whatever operational or process requirement dictates. Q5: Is any cleaning or repainting of the cylinders required, or only inspection, hydrostatic test, refill and stamping? A5: Only inspection, hydrostatic test, refill and stamping.