What is the main function of the applicable service identifier marked on hoses or pipes?

The main function of the applicable service identifier marked on hoses or pipes is to define the intended application and safety standards. This marking plays a crucial role in ensuring that the hoses or pipes are used correctly and safely in specific applications. It identifies the materials and conditions for which the hoses or pipes are suited, including pressure ratings, temperature limits, and chemical compatibility. By having this information readily available, it helps in preventing misuse and potential hazards, ensuring the safety of both the personnel handling the equipment and the integrity of the systems in which they are used.

The other options do not encapsulate the primary purpose of the service identifier. While knowing the hose length requirements, vendor contact details, or color coding can be useful, the critical aspect lies in the identification of the intended application and compliance with relevant safety standards. This focus on safety and application maximizes operational efficiency and minimizes risks in transportation and delivery contexts, particularly in handling materials like compressed natural gas.