What information is required to be marked on each delivery hose assembly?

The requirement for marking a unique number on each delivery hose assembly is crucial for several reasons. This number allows for effective tracking and identification of the hose, ensuring that maintenance and inspections can be easily performed. A unique identifier helps safety personnel keep accurate records of each hose's service history, including any repairs, testing, and compliance with safety standards.

In the context of the NFPA 58 code, marking hoses with a unique number is an essential step in ensuring the integrity and safety of liquefied petroleum gas (LPG) operations. It facilitates accountability and reduces the risk of using hoses that may not meet the safety requirements, thus protecting both personnel and property.

While other information such as the manufacturer's name, installation date, or length of the hose may be of importance, the unique number specifically calls attention to the individual hose's lifecycle and safety compliance, making it the most critical marking requirement as per the NFPA standards.