What color is indicative of lube oil in a piping system?

The correct color indicative of lube oil in a piping system is black and yellow. This color coding is essential because it helps personnel quickly identify the type of fluid that flows through the pipes, ensuring that proper safety and handling measures are followed during maintenance and operations. The black represents the oil itself, while the yellow enhances visibility and alerts personnel to the potential hazards associated with lube oil, such as flammability or slip hazards.

In the context of naval operations, recognizing the correct color codes is crucial for maintaining safety and efficiency onboard. The use of color coding in piping systems is standardized to minimize confusion and enhance communication among crew members during routine checks and emergency situations.