Refineries and terminals undertake mass and volume balances
every month. After accounting for all known losses, adjustments
for bias errors and other known procedural errors, they report
a net loss under the name of "unknown" or "unaccounted" for
loss since the net loss can no longer be explained. This
unknown loss is no longer a mystery.
The concepts presented provide a tool and a
methodology to account for most of the currently reported
unknown loss in most locations. This, thus, enables local
managements to bring a closure (or almost a closure) to their
monthly mass (volume) balances.