Testing pressure vessel for cured concrete pipe sheath

A testing apparatus for permeability testing of a cured concrete sample, comprising:

• a cylindrical pressure vessel having a top cap and a bottom cap, wherein:
• the bottom cap has a first mating surface configured to contact a ring-shaped surface of a bottom face of the cylindrical pressure vessel and accommodate an O-ring to seal the bottom cap to the bottom face of the cylindrical pressure vessel,
• the top cap has a second mating surface configured to contact a ring-shaped surface of a top face of the cylindrical pressure vessel and accommodate an O-ring to seal the top cap to the top face of the cylindrical pressure vessel,
• the top cap has a sample injection port passing from an outer surface of the top cap to an inner surface of the top cap and a casing fluid injection port passing from the outer surface of the top cap to the inner surface of the top cap,
• the casing fluid injection port is axially aligned with the cylindrical pressure vessel,
• the sample injection port is offset from axial alignment with the cylindrical pressure vessel to fluidly connect the sample injection port at an upper annular space within an enclosed space of the cylindrical pressure vessel,
• the bottom cap has a casing fluid outlet port passing from an inner surface of the bottom cap to an outer surface of the bottom cap and an outlet port passing from the outer surface of the bottom cap to the inner surface of the bottom cap,
• the top cap has a top cylindrical protrusion having a diameter less than a diameter of the top cap and configured to inset into the enclosed space of the cylindrical pressure vessel forming the upper annular space between an outer cylindrical surface of the top cylindrical protrusion and an inner surface of the cylindrical pressure vessel, and
• the bottom cap has a bottom cylindrical protrusion having a diameter less than a diameter of the bottom cap and configured to inset into the enclosed space of the cylindrical pressure vessel forming a lower annular space between an outer cylindrical surface of the bottom cylindrical protrusion and the inner surface of the cylindrical pressure vessel;
• a hydraulic inlet passing from an outer surface of the cylindrical pressure vessel to an outer surface of a sleeve, wherein the sleeve is positioned adjacent to the inner surface of the cylindrical pressure vessel and the hydraulic inlet;
• and
• a plurality of pressure ports mounted proximal to the sleeve to measure a pressure exerted on the sleeve.