A320 ACFT EXPERIENCED ENG BLEED AIR AND PRESSURIZATION FAILURE AT FL310. DECLARED EMER; DSNDED AND DIVERTED TO MSY.

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CLBING OUT OF MCO ON THE A320; WE HAD AN ECAM BLEED PROB. CALLED MAINT CTL AND HE SAID TO RECYCLE VARIOUS CIRCUIT BREAKERS. THE PROB TURNED INTO A PRESSURE PROB AND AS WE SAW THE CABIN PRESSURE RISING ABOVE 7000 FT AND CLBING; I DECLARED AN EMER AND STARTED AN EMER DSCNT TO 10000 FT. I ALSO USED MY EMER AUTH TO HAVE THE FO PUSH IN THE CIRCUIT BREAKER THAT MAINT CTL HAD TOLD US TO PULL OUT. WE DSNDED TO 10000 FT; CALLED DISPATCH; AND DECIDED TO PROCEED TO MSY INSTEAD OF ATL DUE TO DETERIORATING WX IN ATL. TOLD THE FLT ATTENDANTS THE PROB AND THE ETA TO MSY. TALKED TO THE PAX AND INFORMED THEM ABOUT THE PROB AND WHERE WE WOULD BE DIVERTING TO. LANDED OVERWT AT MSY (151000 LBS) WITH LESS THAN 200 FPM VERT DSCNT ON THE LONGEST RWY INTO THE WIND (RWY 28). MAX CABIN ALT WAS A LITTLE OVER 10000 FT AND THE PAX OXYGEN MASKS DID NOT DEPLOY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ADVISED THE OVERWT LNDG WAS NOT BY CHOICE BUT BECAUSE THE A320 DOES NOT HAVE A FUEL DUMP SYS.