What is the minimum slope required for vent piping back to the tank?

The minimum slope required for vent piping back to the tank is typically specified as 1/8 inch per foot. This slope ensures proper drainage of any condensation or liquids that may accumulate in the vent piping, preventing blockages or potential failure of the vent system. A slope of 1/8 inch per foot allows for adequate flow of vapors and prevents liquid from sitting in the vent line, which can create pressure variations and operational issues.

In the context of UST regulations and standards, ensuring that vent piping is installed with the correct slope is crucial for safety and compliance. Having a sufficient slope also helps maintain optimal operating conditions, allowing for the effective venting of vapor and maintaining atmospheric balance within the tank.