What is the main purpose of marking water capacity on a cylinder?

The main purpose of marking the water capacity on a cylinder is to provide a reference for the weight of the cylinder when it is filled, as water capacity is often used to assess the volume of liquefied petroleum gas (LPG) that can be safely contained within the cylinder.

Knowing the water capacity allows handlers to calculate the maximum weight of the cylinder when filled with gas, which is crucial for safe transport and handling. This weight reference is critical for ensuring that cylinders are not overloaded beyond their designed limits, which could compromise safety and structural integrity. Furthermore, it aids in compliance with various transport regulations that require knowledge of weight limits.

In summary, the marking of water capacity serves as a crucial indicator for safe transport and handling, aligning with the principles outlined in NFPA 58 regarding safety management in LPG storage and transport.