S R Gas Agency

Buying or Using a Used Oxygen Cylinder – Important Considerations:

Inspection & Safety:

• Cylinders must be visually inspected and hydrostatically tested (typically every 5 years).
• Look for stamps or markings with test dates (e.g., "05 20" for May 2020).
• Ensure there's no corrosion, rust, or damage to the tank or valve.

Regulatory Compliance:

• In many countries (like the U.S.), gas cylinders must meet DOT or ISO standards.
• Medical oxygen cylinders must be clean and contamination-free.

Valve Compatibility:

• Confirm the valve type matches your oxygen regulator.

• Common valves: CGAs (Compressed Gas Association fittings), like CGA 870 or CGA 540.

Refill or Exchange:

• Used cylinders may be refilled at certified gas suppliers or exchanged for full ones.

• Some suppliers may refuse to refill cylinders that are out-of-date or fail inspection.

Cost:

• Used cylinders cost less than new ones but may require testing or re-certification.

• Common sizes: M6, D, E, M60, H (the larger the size, the higher the capacity in liters).