> Every chemical doesn't have to have a different connector. Maybe just ones that will cause a dangerous reaction if mixed.
The issue is that they're buying chemicals from vendors so they don't necessarily have control of what connectors are on the truck. If you have Bleach in connector A and acid in connector B, you better hope they don't send an acid truck with an A connector.
I think having a way to close the fill lines remotely would have at least seriously downgraded the problem.
I doubt every chemical facility uses the same style connector, so at some point in time this information would have had to be communicated to the chemical supplier anyway. And sure, the supplier could just happen to send the truck with the exact right connector for the other chemical (though that wouldn't be a problem if they just moved the inlets apart), but that's a lot less likely than a screw up when the connectors are the same. I'm not saying (and I doubt the CSB is either) that any of this would eliminate the possibility of incidents. The point is that they'd become much less likely.
The issue is that they're buying chemicals from vendors so they don't necessarily have control of what connectors are on the truck. If you have Bleach in connector A and acid in connector B, you better hope they don't send an acid truck with an A connector.
I think having a way to close the fill lines remotely would have at least seriously downgraded the problem.