What is the diameter of a vent pipe on a 660 gallon or less oil tank?

The diameter of a vent pipe on a 660-gallon or less oil tank is specified as 1-1/4 inches. This size is important for ensuring that the venting system can adequately handle the air displacement when the tank is being filled. A correctly sized vent pipe minimizes the risk of over-pressurization or vacuum conditions within the tank, which can lead to operational failures or safety hazards. Moreover, using a vent pipe that meets this specification enhances the efficiency of the filling process and helps in the proper drainage of vapors, which is critical for both safety and environmental compliance. The choice of 1-1/4 inches aligns with industry standards and best practices for oil storage systems of this capacity.