초록 ▼

The tubular connection includes a pin member having external tapered threads extending from a pin nose to a pin base and a box member having internal tapered threads extending from a box base to a box nose. The tapered threads are square or near square threads having stab and load flanks with accomm

The tubular connection includes a pin member having external tapered threads extending from a pin nose to a pin base and a box member having internal tapered threads extending from a box base to a box nose. The tapered threads are square or near square threads having stab and load flanks with accommodating grooves. The stab flanks have corner chamfers which engage upon stabbing the pin member into the box member. The comer chamfers increase the clearances between the threads and grooves and guide the crests to the root openings upon relative rotation of the pin and box members. The stab flanks may have an increased thread width at the thread pitch line forming cam flanks which cam the threads into the grooves. The crests and roots of the threads interferingly engage. The pin nose and box base engage to form a metal-to-metal seal and a primary torque shoulder which during power tight make-up causes the load to shift from the stab flanks to the load flanks. The pin nose and box base lock up such that upon the application of further torque, the threads lock up from the pin nose back to the pin base thereby transferring substantially all of the remaining applied torque to the threads whereby the seal becomes insulated from any additional make up torque.

대표청구항 ▼

[ What is claimed is:] [1.]1. A tubular connection comprising:a pin member having a nose and a base with external tapered constant width threads extending from said nose to said base;a box member having a nose and a base with internal tapered constant width threads extending from said base to said n

[ What is claimed is:] [1.]1. A tubular connection comprising:a pin member having a nose and a base with external tapered constant width threads extending from said nose to said base;a box member having a nose and a base with internal tapered constant width threads extending from said base to said nose;said external and internal tapered threads being square or near square threads having stab flanks and load flanks with thread grooves between said threads;said stab flanks having corner chamfers which engage upon said pin member being inserted into said box member;said corner chamfers guiding said threads into said thread grooves upon multiple relative rotations of said pin and box members and said pin nose engaging said box base to form a torque shoulder upon assembly.