Just been using the flange checker as part of some work I'm doing (not used CAESAR II in a bit) and I think there might be an error in it.
My first reaction was there is something wrong here - no way are those flanges overloaded by that much, but a bit of digging revealed the following (I think)
It appears when you're working in SI units the Peq module pulls through the gasket diameter in inches but still evaluates the loads, especially the moment, in the user units. So in my case we have Nm being evaluted against inches and not mm.
So for one typical node the output was
Node----F-------M-------G/C-----Peq-------Temp---Pallow
--------N-------Nm------mm------bar-------C------bar

1270----980-----984-----13.82---19151.87--130----91.49

Note the Peq is over 19000bar (277690psi!!) on a 600# flange!
A quick glance and check showed that the G dimension was still in inches and not the correct equivalent in mm. since this figure gets cubed or squared this is a big big difference. The correct figures I think are
G---------P_bend----------P_axial-------P_oper----P_eq
mm--------MPa-------------MPa-----------MPa-------bar
351.028---O.1158----------0.01012-------8.1-------82.2

Thats more like it!
Can anybody spot any flaws in the logic and I'm not sure if the bug has been fixed yet.

So as ever it's always helpfull to know when the answer is wrong and don't beleive everything the 'puter tells you!!