In NFPA standards, what is generally required of pipes to ensure compliance?

Pipes must include marking from the manufacturer to ensure compliance with NFPA standards. This marking is crucial because it provides essential information regarding the pipe's specifications, including the material, pressure rating, and compliance with relevant standards. Such markings help technicians and inspectors quickly identify if the materials being used meet the required safety and performance criteria. This is particularly important in fire protection systems where using appropriate materials is critical for safety and efficiency.

Options that suggest pipes need protective paint or dynamic testing, while relevant in certain contexts, do not apply as universally or are not part of the fundamental marking requirements set by NFPA standards. Likewise, the option that suggests pipes are only inspected upon installation does not align with ongoing compliance and safety protocols that emphasize the importance of continuous inspections and testing even after installation.