FUEL DUMPED AND LGT RETURN LAND AFTER BLOWN TIRE ON TKOF.

Narrative

AT ABOUT 10-15 KTS PRIOR TO V1 WE FELT SOMETHING UNUSUAL -- LIKE WE HIT SOMETHING -- RAN OVER SOMETHING ON RWY. EVERYTHING ELSE WAS NORMAL. WE ROTATED AND THE FO ASKED THE TWR IF THEY NOTICED ANYTHING ABNORMAL WITH THE TKOF. THEY SAID NO; SO WE BROUGHT THE GEAR UP AND SHORTLY AFTERWARDS; LOST B SYS HYD PRESSURE AND QUANTITY. WE ASKED FOR A FLY-BY OF THE TWR TO HAVE THEM LOOK AT GEAR; DECLARED AN EMER AND FLEW TO 10000 FT TO DUMP FUEL. WE CALLED THE HEAD FLT ATTENDANT UP TO ADVISE HER OF SIT AND HAVE THEM PREPARE CABIN FOR LNDG. I CALLED COMPANY TO ADVISE THEM OF OUR SIT AND BEGAN TO READ THE ABNORMAL CHKLIST FOR REVIEW (WHILE DUMPING APPROX 18000 LBS OF FUEL TO GET PLANE AS LIGHT AS POSSIBLE). THE CAPT FLEW THE PLANE; FO WORKED RADIOS. TWR ADVISED THE #2 L MAIN TIRE BLEW; THEN WE PROCEEDED WITH ABNORMAL CHKLIST AND SET UP TO LAND ON 35R. WE LANDED AT ABOUT 140000 LBS. LNDG WAS SUCCESSFUL. NO EVAC REQUIRED. WE SHUT DOWN ENGS AND MAINT TOWED US OFF RWY. I DID NOTICE THE BRAKES WERE WARMER THAN USUAL DURING MY PREFLT. IT WAS 88 DEGS THAT DAY. I ADVISED THE CAPT; HE LOOKED AT THEM AND ASKED MAINT TO CHK ON THEM. THERE WAS NO LOGBOOK WRITE-UP FROM CREW BRINGING ACFT INTO DEN THAT THEY'D EXCEEDED THE MINIMUM QUICK TURN WT; AND BESIDES; WE WERE ON THE GND IN EXCESS OF THE 44 MINS REQUIRED BY THE CHART ANYWAY. SUPPLEMENTAL INFO FROM ACN 249547: DETERMINED BLOWN TIRE TORE A LINE IN HYDS TO THE BRAKE.