Which material should not be used for fill pipe risers?

Fill pipe risers are an essential component of underground storage tank systems, responsible for managing the inflow of fuel or other liquids into the tank. The choice of material for these risers is crucial for safety, durability, and compliance with regulations.

The selection of nonmetallic materials for fill pipe risers is not advisable primarily due to concerns about their chemical resistance and structural integrity. Nonmetallic materials can be more susceptible to degradation from the corrosive nature of certain liquids, especially fuels. This could lead to failures such as cracks or leaks over time, posing significant safety hazards, including environmental contamination and fire risks.

On the other hand, materials like metals are typically used for fill pipe risers due to their robust resistance to damage and high integrity under a variety of environmental conditions. These materials can withstand pressures and impacts that might affect nonmetallic alternatives. Composite materials can also be appropriate as they may offer a blend of chemical resistance and strength.

Choosing suitable materials for fill pipe risers is critical to ensuring the safety and longevity of the UST systems. Thus, avoiding nonmetallic materials aligns with best practices and regulatory guidelines for installation and retrofitting of underground storage tanks.