Gallon Biogas Storage Tank: Sizing Biogas Digesters and Gasholders in US Gallons Biogas projects in the United States, Caribbean, and other imperial-unit markets are planned, permitted, and operated in gallons - yet most tank specifications arrive in cubic meters. That mismatch forces constant conversion and invites errors at the worst moments: equipment sizing, permit submittals, and operator dashboards. Specifying biogas tanks directly in gallons keeps the entire project in