Largest U.S. Gas Spill in 20 Years - 1.2 Million Gallons

[ProfessorGAC]

15. Pumps Are Interlocked

They don't measure pressure alone they measure delta P, or the difference in pressure between booster stations.
For gasoline, with constant line size the delta is very easy to calculate for any given flow. And the transducers are accurate to within 0.01 psig.
Turning up the pressure at output doesn't change the excessive delta P. 10psig of loss beyond calculated is that if we go from 300-200 (target 90 delta P due to frictional loss) it's the same as going from 320-220.
The pumps would still interlock.
I'm thinking this was a small leak that lasted a while, otherwise the EDI financial transactions would have caught a sudden big inventory loss. Losses accumulating to $2+ million over a month will get caught at close of monthly book.
$2+ million in a day gets flagged by the software immediately.
That's why I'm thinking a small leak.
No big change in daily receipts, no big delta P issues.