The maximum intended inventories refer to the maximum amount of any regulated chemical that may be expected to be present in the whole facility at any time.
Reference: Lees’ Loss Prevention in the Process Industries: Hazard Identification, Assessment and Control (3 Volumes), 4th Edition. By Sam Mannan.
The maximum intended inventories for all storage tanks, reactors, drums and other vessels with either standing or variable levels must be provided. To ensure clarity, this inventory should be expressed in terms of a measured parameter, such as the output of a level detector. In this manner, the actual inventories can be compared easily and quickly to the maximum intended inventories with no conversion and little or no interpretation by plant personnel.
Reference: Maximum intended inventories definition by Environmental and Health & Safety Management – A Guide to Compliance, ISBN 978-0-8155-1390-2