What is the best method to protect hard wall piping from solar radiation?

Burying the pipe is an effective method to protect hard wall piping from solar radiation because it shields the piping from direct exposure to sunlight. When pipes are buried underground, they are insulated from temperature extremes and direct UV radiation, which can lead to material degradation over time. This method provides a long-term solution for maintaining the structural integrity of the piping and reducing the risk of thermal expansion or contraction that can occur from temperature fluctuations caused by solar heating.

Other methods, while they may offer some level of protection, may not be as effective or practical in all scenarios. For example, painting the piping can provide a reflective surface that reduces heat absorption, but it may require frequent maintenance to ensure the paint remains intact and functional. Keeping water moving through the pipes can help maintain a stable temperature but may not be feasible depending on the system design and could complicate water management. Covering the pipe with camouflage material could provide some protection against UV rays, yet it may not be specifically designed for thermal insulation and could also require regular upkeep to prevent wear and tear. Thus, burying the pipe remains the most reliable and effective method for long-term protection against solar radiation.