Patent ID: 8353217

Claim:
Test machine to apply a uniform internal pressure to a tube ( 21 ), comprising a body ( 1 ), a piston ( 3 ) sliding in the body and varying a volume of a liner ( 2 ) contained in the body ( 1 ), an annular elastic bladder ( 18 ) surrounding a periphery of the body, the periphery of the body comprising two circular ribs ( 12 , 13 ) and a recess ( 14 ) separating the ribs and communicating with the liner ( 2 ), the machine also comprising two flanges ( 6 , 7 ) fixed to the body at two opposite ends and comprising annular mating flanges ( 9 , 10 ) surrounding the ribs ( 12 , 13 ) respectively, the bladder ( 18 ) being clamped at each of the two opposite ends between one of the ribs and one of the mating flanges.