Cylinders of what capacity must incorporate protection against physical damage to their appurtenances?

Cylinders with a capacity of 1000 lbs must incorporate protection against physical damage to their appurtenances due to safety regulations and standards governing the storage and handling of propane. Propane cylinders of this size are significant in their potential hazard when not properly protected. The physical damage to appurtenances, such as valves and regulators, can lead to leaks or catastrophic failures. Therefore, regulations mandate that such cylinders be equipped with protective measures, like collision guards or other forms of physical barriers, to mitigate the risk of damage in various scenarios, including transportation and storage.

In contrast, smaller cylinders may have different safety requirements based on their volume and the associated risk of handling them. The larger capacity and weight of the 1000 lb cylinder necessitate stricter protective measures to ensure the safety of personnel and the surrounding environment.