Power steering line blow off...CONTINUALLY on 1999 Chevrolet Lumina

hubby replaced the radiator..which the water pump and power steering pump had to come off... after all back on.. was checking for leaks..and the metal to rubber hose keeps blowing off.. clamps are as tight as they can get.. we even double clamped both ends... what are we doing wrong for this to not stay on ? THANK YOU FOR ANY HELP !

Asked by for the 1999 Chevrolet Lumina
get a new high pressure line on car u can cut and clamp that hose
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how do i replace ther water pump