What color should the paint be on surfaces of cylinders in direct or indirect sunlight?

The correct color for surfaces of cylinders in direct or indirect sunlight is white. This choice is based on the principles of heat management and safety.

Painting cylinders white helps to reflect sunlight and minimizes heat absorption, which is especially important for safety in compressed natural gas applications. High temperatures can increase pressure within the cylinder, potentially leading to safety hazards. By using a reflective color such as white, the temperature of the cylinder is kept lower, reducing the risk of excessive pressure build-up.

Additionally, lighter colors are often preferred for visible identification and safety signaling purposes, further supporting the use of white as the appropriate choice in this context.