A flexible hose connector on a cargo tank must be permanently marked with what information?

In the context of NFPA 58, permanently marking flexible hose connectors on cargo tanks is crucial for safety and maintenance purposes. The correct answer points to the practice of indicating the date of installation, which provides essential information regarding the lifespan and reliability of the hose. This date helps professionals determine whether the hose is due for replacement or inspection, thereby ensuring compliance with safety regulations and minimizing the risk of leaks or failures during operation.

Permanently marking the date of installation also creates a historical record that can be referred to during routine maintenance and inspections, contributing to efficient management of the equipment and adherence to best practices in safety.

Other options, while potentially important for different contexts, do not hold the same level of critical importance for the marking of flexible hose connectors in cargo tanks as the date of installation. Knowing the manufacturer's name, length of the hose, or pressure rating can be useful, but these details are generally documented elsewhere and do not impact the immediate operational safety of the flexible hose connector as directly as the installation date.