High pressure duct connection

Claim 1

A DUCT JOINT FOR THE CONNECTION OF ADJACENT ENDS OF DUCT SECTIONS COMPRISING ON EACH END OF SAID DUCT SECTIONS, AND AS AN EXTENSION OF THE WALLS OF EACH DUCT SECTION, AN INTEGRAL IMPERFORATE STIFFENING FLANGE EXTENDING PERPENDICULARLY OUTWARDLY FROM THE WALLS OF THE DUCT SECTIONS AND HAVING A STIFFENING GROOVE THEREON AND ON BOTH FACES OF EACH OF SAID FLANGES SPACED OUTWARDLY FROM THE DUCT SECTION WALLS AND INWARDLY OF THE OUTER MARGINS OF THE FLANGE, SAID FLANGES BEING DISPOSED IN MEETING RELATION AT THE INNERMOST PORTIONS THEREOF WITH THE INERIORS OF SAID GROOVES IN FACING RELATION, PLASTIC PACKING MATERIAL BETWEEN SAID FLANGES AND IN THE SPACES IN SAID GROOVES, SPACED CLAMPING MEMBERS HAVING ELONGATED PORTIONS ENGAGING SAID DUCT WALLS AND OPPOSITE EXTERIOR PORTIONS OF SAID FLANGES AT LOCATIONS CONTIGUOUS TO THE MEETING PORTIONS THEREOF AND BETWEEN SAID GROOVES AND SAID DUCT WALLS RETAINING THE DUCT SECTIONS IN ALIGNMENT AND IN SEALED CONDITION AT SAID FLANGES, SAID DUCT SECTIONS HAVING FLAT SIDES AND CORNERS AT MEETING LOCATIONS OF SAID SIDES AND SAID FLANGES AT THE CORNERS HAVING INSERTS EXTENDING AROUND THE CORNERS, MEANS RETAINING SAID INSERTS AGAINST SAID FLANGES, SAID CORNER INSERTS HAVING GROOVES CONNECTING THE GROOVES OF SAID FLANGES, SAID PLASTIC PACKING MATERIAL SUBSTANTIALLY FILLING SAID GROOVES IN SAID INSERTS, AND SAID PLASTIC PACKING MATERIAL IN ALL OF SAID GROOVES COOPERATING TO FORM A FLUID TIGHT SEAL COMPLETELY AROUND SAID JOINT.