A B757-200 IN CRUISE AT FL390 DECLARED AN EMER DUE TO LOSS OF THE L HYD SYS PRESSURE AND QUANTITY. CAUSED BY A CHAFFED ENG HYD LINE.

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ENRTE AT FL390 FROM JFK TO LAS; THE L HYD SYS BEGAN LOSING FLUID. WE ELECTED TO LAND AT OUR DEST IN LAS VEGAS AND DISCUSSED THE PROB WITH DISPATCH AND MAINT CTL. THE FLT ATTENDANTS WERE BRIEFED THAT A NORMAL LNDG WOULD BE PLANNED AND THAT EMER EQUIP WOULD BE STANDING BY AS A PRECAUTION. THE PAX WERE BRIEFED CONCERNING THE MALFUNCTION AND INFORMED THAT A NORMAL LNDG WAS PLANNED WITH EMER EQUIP STANDING BY AS A PRECAUTION. WE DECLARED AN EMER WITH ATC AND RECEIVED PRIORITY HANDLING TO THE ARPT. THE STANDPIPE FLUID/PTU FUNCTION DID NOT SUPPLY ENOUGH HYD PRESSURE; SO THE FLAPS WERE LOWERED BY ALTERNATE MEANS. THE GEAR EXTENDED NORMALLY; BUT THE GEAR DOORS REMAINED DOWN. SINCE NOSEWHEEL STEERING WAS NOT AVAILABLE; WE STOPPED ON THE RWY AND WERE TOWED TO THE GATE. THE LNDG WAS UNEVENTFUL; ALL CHKLISTS WERE ACCOMPLISHED PROPERLY; AND THE FLT ARRIVED SAFELY IN LAS VEGAS. AS PREVIOUSLY BRIEFED; THE PAX DID NOT BRACE FOR LNDG. APPARENTLY; COMPANY GND PERSONNEL ASSUMED THAT IT WAS A 'PLANNED EMER' IN WHICH PAX SHOULD BRACE FOR LNDG. ALTHOUGH THIS WAS CONFUSING FOR OPS PERSONNEL; THE FLT ATTENDANTS AND PAX WERE WELL INFORMED AS TO OUR PLANNED NORMAL LNDG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE LOSS OF #1 HYD SYS PRESSURE AND QUANTITY WAS CAUSED BY A CHAFFED HYD LINE ON #1 ENG R SIDE. THE RPTR SAID THE LINE WAS POORLY ROUTED AND CLAMPED TOO CLOSE TO AN ENG COMPONENT AND RUBBED RIGHT THROUGH.