A320 FLT CREW HAS A LOSS OF CABIN PRESSURIZATION WHILE ENRTE TO PHL.

Narrative

DURING CRUISE AT FL370 (ENRTE PHL; DEPARTED DEN) AUTOPLT ON; FO FLYING. PRESSURIZATION #1 SYS FAILED. AUTOMATIC SWITCH TO PRESSURIZATION #2 SYS WHICH FAILED WITHIN 1 MIN OR SO. MANUAL SYS UNABLE TO MAINTAIN REQUIRED PRESSURE. CAPT ASSUMED CTL; BEGAN EMER DSCNT AFTER CLRING WITH ZAU. BOTH CREW MEMBERS DONNED OXYGEN MASKS; ACCOMPLISHED CHKLIST AND BEGAN DSCNT TO 10000 FT. AT 22000 FT; CAPT GAVE AIRPLANE TO FO WHILE CAPT BRIEFED FLT ATTENDANTS AND CONTACTED COMPANY DISPATCHER. ACFT LEVELED AT 10000 FT. MAX CABIN ALT ATTAINED APPROX 11700 FT. NO MASK DEPLOYED IN CABIN. FLT ATTENDANTS USED WALKAROUND OXYGEN BOTTLES. AFTER CONFERRING WITH COMPANY DISPATCH REGARDING FUEL AND WX; IT WAS DETERMINED WE COULD GO ON TO ORIGINAL DEST -- PHL. ALL CREW MEMBERS AGREED. ALL PAX WERE OKAY; NO MEDICAL OR ABNORMAL SITS IN CABIN. FLT REMAINED AT 10000 FT AND FLEW ON TO PHL. WX CLR AND SMOOTH RIDE. LANDED PHL 5000 LBS FUEL; WELL ABOVE REQUIRED. MAINT ADVISED OF PRESSURIZATION FAILURE. NO OTHER ABNORMALITIES OCCURRED DURING FLT.