What does 49 CFR 178.506 (Standards for metal drums other than steel or aluminum) require?

Based on 49 CFR 178.506, the construction and standard requirements for metal drums made of metals other than steel or aluminum are as follows:

* Identification Codes: Use code 1N1 for a non-removable head metal drum, and code 1N2 for a removable head metal drum.

* Body and Heads: Must be made of a suitable type of metal with a thickness adequate for the drum's capacity and intended use. If the drums are meant for reuse, minimum thickness and marking requirements in §§ 173.28(b)(4) and 178.503(a)(9) apply.

* Seams: All seams must be welded. If there are chime seams, they must be reinforced with separate reinforcing rings.

* Rolling Hoops: Drums with a capacity greater than 60 L (16 gallons) may feature at least two expanded rolling hoops or two separate rolling hoops. Separate hoops must fit tightly, be secured to prevent shifting, and cannot be spot-welded.

* Openings and Closures (Non-Removable Head - 1N1): Openings for filling, emptying, or venting cannot exceed 7.0 cm (3 inches) in diameter (larger openings make it a removable head drum, 1N2). Closures must remain secure and leakproof under normal transport conditions, use gaskets or sealing elements (unless inherently leakproof), and closure flanges may be welded to create a leakproof seam.

* Closures (Removable Head - 1N2): Closure devices must stay secure and the drums must remain leakproof under normal transport conditions. Gaskets or other sealing elements must be used with all removable heads.

* Compatibility: If the materials of the body, heads, closures, and fittings are not compatible with your cargo, you must apply suitable internal protective coatings or treatments that maintain their protective properties during normal transport.

* Capacity and Mass Limits: The maximum capacity of the drum is 450 L (119 gallons), and the maximum net mass is 400 kg (882 pounds).