What does the marking 4BW-240 indicate on a cylinder?

The marking 4BW-240 on a cylinder provides important information regarding its design and operational parameters. Specifically, this marking indicates the design code, which helps to identify the specifications and construction standards that the cylinder meets, and the service pressure, which specifies the maximum pressure at which the cylinder is safe to operate.

The "4BW" portion refers to the design standard, indicating specific construction criteria, while "240" signifies the maximum service pressure in bars, which in this case is equivalent to 240 bar. This distinction is essential for ensuring safety and compliance with regulations, as it helps users understand the proper operating conditions for the cylinder.

In contrast, the other options do not accurately encompass what the marking conveys. The first option only addresses the type of cylinder rather than the comprehensive details encoded in the marking. The third option, focusing on weight and capacity, does not relate to the marking provided, as that information is typically found elsewhere on the cylinder or in accompanying documentation. Lastly, the option concerning the year of manufacture is not represented within this specific marking, as date information follows a different format and is not included in the design and pressure notation.