AN A319 CREW EXPERIENCED A DOUBLE ENG BLEED FAILURE CAUSING LOSS OF PRESSURIZATION. AN EMER WAS DECLARED AND THE CREW RETURNED TO DEP ARPT FOLLOWING AN EMER DSCNT.

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WE WERE CONDUCTING A MAINT FERRY FLT UNDER PART 91 FOR AN UNRELATED PROB WITH DEADHEADING CREW MEMBERS AND A TECHNICIAN ON BOARD. RIGHT AFTER TKOF; WE HAD AN 'AIR BLEED #1' FAULT. FO CONTINUED TO FLY AIRPLANE AS WE COMPLIED WITH ECAM ACTIONS. AFTER BLEED TEMP COOLED; WE SELECTED THE #1 BLEED BACK ON AND THE TEMP CLBED AGAIN AND FAULTED. AGAIN; WE COMPLIED WITH ECAM ACTIONS. AFTER CLBING THROUGH 10000 FT; WE CONTACTED MAINT AND WERE ADVISED TO FOLLOW PROCS AND VERIFIED WITH THEM THAT NO ALT RESTRS EXIST IN THIS SIT. WE CONTINUED THE CLB AND LEVELED OFF AT FL380. WITHIN A FEW MINS OF LEVELOFF; WE HAD AN 'AIR BLEED #2' FAULT. WE COMPLIED WITH ECAM ACTIONS AND DONNED OXYGEN MASKS. WE THEN COORD AN EMER DSCNT WITH ATC; STARTED DOWN; DECLARED AN EMER AND REQUESTED VECTORS BACK TO ZZZZ. WE PROCEEDED TO TURN BLEED #1 BACK ON IN ORDER TO MAINTAIN PRESSURIZATION. IT LATER FAULTED; WE FOLLOWED ECAM AND THEN RE-SELECTED BLEED #2. IN THE MEANTIME; WE WERE CONCERNED THAT THE CABIN WOULD CLB AT A FAIRLY RAPID RATE AND ADVISED DEADHEADING CREW MEMBERS TO DON OXYGEN MASKS IN PREPARATION. SINCE THE CABIN ALT WASN'T OVER 10000 FT YET; THE MASKS HADN'T DROPPED (CABIN ALT HT WAS +9000 FT). WE WERE ADVISED THAT MASKS WERE NOT YET DOWN AND WE WERE NOT CONFIDENT THAT BLEED #2 WOULD STAY ON. SO I LOOKED UP TO FIND MANUAL SWITCH FOR OXYGEN; WAS DISTR WITH ATC; LOOKED BACK UP AND ACCIDENTALLY DEPLOYED THE RAM AIR TURBINE INSTEAD. AFTER REALIZING MY MISTAKE; I MADE A CONSCIOUS EFFORT TO SLOW DOWN A LITTLE AND ELECTED NOT TO DEPLOY THE MASKS UNLESS THE CABIN EXCEEDED 10000 FT AND THE AUTO FEATURE DIDN'T KICK IN. (CABIN ALT NEVER REACHED 10000 FT.) WE CONTINUED TO ZZZZ AND LANDED SAFELY WITH BLEED #1 OFF AND BLEED #2 ON. WE WERE IMPRESSED WITH HOW TIGHT THE CABIN WAS AND HOW THE CABIN MAINTAINED A FAIRLY LOW CLB RATE EVEN WITH BOTH BLEEDS OFF.