Liquid Oxygen Storage — LOX Cryogenic Tank Selection

Storing Liquid Oxygen? Start Here

Liquid oxygen (LOX) is a pale-blue, cryogenic liquid used in various industries such as medical, steelmaking, aerospace, and wastewater treatment. It is both extremely cold and a strong oxidizer, meaning it can accelerate combustion. This makes LOX one of the most regulated substances, requiring careful handling and storage. If you're considering storing LOX, it's crucial to understand its properties and the specific requirements for safe storage.

Can you store it in a poly tank?

No, you cannot store liquid oxygen in a polyethylene tank. Polyethylene and other plastics like HDPE, XLPE, PVC, and FRP are not suitable due to their inability to withstand LOX's low temperatures and the risk of combustion. Instead, materials like 304 or 316 stainless steel, Monel, or 9% nickel steel are recommended for LOX storage.

Handling the Cold and Combustion Risks

Liquid oxygen is a cryogen and a potent oxidizer, which means it can cause materials to become extremely brittle and ignite easily. It's essential to use materials that are cleaned for oxygen service (CFOS) to avoid any contamination that could lead to ignition.

The safety that actually matters

• Always use equipment that is "Cleaned For Oxygen Service" (CFOS) to prevent contamination and ignition.
• Ensure proper ventilation to avoid oxygen enrichment at floor level, which can create a fire hazard.
• Maintain regulatory compliance with standards like NFPA 55 and CGA P-8 for safe storage and handling.

Common questions

What happens if LOX spills?

LOX spills can pool at floor level, creating an oxygen-rich environment that increases fire risk. Proper ventilation is crucial.

Why can't I use regular lubricants with LOX?

Petroleum-based oils and greases can ignite in the presence of LOX. Only use oxygen-service-rated lubricants like Krytox PFPE.

What materials are safe for LOX storage?

Materials like 304/316 stainless steel, Monel, and 9% nickel steel are safe for LOX storage when CFOS-cleaned.