What is the maximum permitted dimension out of round for a low pressure tank?

The maximum permitted dimension out of round for a low pressure tank is 12 inches. This standard is established to ensure that tanks maintain structural integrity and operational efficiency. When tanks are out of round, it can lead to uneven distribution of stress and pressure, which may compromise their functionality and safety. By allowing a maximum out of round dimension of 12 inches, regulations aim to establish a balance between the practicalities of manufacturing and installation while ensuring enough tolerance to account for minor deviations that can occur during the tank's lifecycle. This guideline helps in preventing issues related to leakage, instability, or failure, thus safeguarding both the tank's contents and the surrounding environment.