A compressed gas cylinder is a potential bomb when mishandled. A cylinder of oxygen at 2,200 PSI with a damaged valve can be propelled through a concrete wall like a rocket — the kneck failure case is an engineering reality, not a myth. Cylinders on NYC construction sites must be secured, stored correctly, and never abused. The rules exist because the consequences of getting them wrong are catastrophic.

• Cylinders must be stored upright and secured with a chain, strap, or bracket — never stored flat unless the manufacturer specifies otherwise (some specialty cylinders)
• Oxygen and fuel gas (acetylene, propane) cylinders must be stored at least 20 feet apart, OR separated by a 5-foot-high non-combustible wall with a 30-minute fire rating
• Cylinders not connected to equipment must have their valve protection caps installed — this is the most commonly violated cylinder rule
• Storage areas must be away from heat sources, electric panels, and high-traffic areas where carts could strike them

• Always use an approved cylinder cart with a chain — never roll a cylinder on its edge, carry it in your arms, or let it drop
• Never use a cylinder as a roller to move other material
• Close the valve and install the cap before moving any cylinder — even for short distances
• Leaking cylinders: move to an open area if safe to do so, open windows and doors, call the supplier — never attempt to repair a leaking cylinder valve