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The maximum pressure range for an anaerobic digester's vacuum relief valve is typically set to ensure safe operation while preventing the collapse of the digester under vacuum conditions. A vacuum relief valve protects the system from negative pressures that may occur when the gas is being removed or when there are changes in temperature or pressure within the digester.

Setting the relief valve at 13.0 psi allows for adequate protection while still enabling optimal anaerobic digestion conditions to be maintained. This pressure point helps balance the need to avoid excessive negative pressure with the operational requirements of the digester.

Other pressure settings may either be too low, resulting in inadequate protection, or too high, which could lead to system failures or compromises in the integrity of the digester structure. Therefore, the choice of 13.0 psi as the maximum pressure is essential for ensuring the longevity and functionality of the anaerobic digestion system.