Threaded pipe joint
AssigneeTenaris Connections Limited
InventorsGabriel E. Carcagno, Giuseppe Della Pina, Rita G. Toscano, Antonio Podrini
Life of this patent
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Abstract
Threaded pipe joint comprising a male element (1) and a female element (2), threaded and provided with respective complementary sealing surfaces, which define, when screwed together, a notch (13) formed on the female element (2) of a predetermined length (X), and a space (7, 8) between the threads of predetermined section (S), forming reservoir to house the joint lubricant, which comes out of the volume between the threads of the female (2) and male (1) elements during the tightening of the joint.
Claims10
A threaded joint for pipes, comprising a generally tubular male element (1) with a nominal external diameter (D) carrying a respective male threading near to one of its ends, comprising teeth (1′), having each lead-in (6) and load (4) flanks, with roots there between and, between said end and said respective thread, a first unthreaded surface (12) carrying a first sealing surface (10), and a generally tubular female element (2) carrying a respective female threading close to one of its ends, comprising teeth (2′), having each lead-in (5) and load (3) flanks, with roots there between and, between said end and said respective thread, a second sealing surface (11), complementary to said first sealing surface (10), said male and female threads defining between them, when screwed together, a space to store lubricant, said male (1) and female (2) elements defining a common symmetrical axis (A) of the joint, said female element (2) being further provided with a notch (13) between said respective female thread and said second sealing surface (11), of a substantially toroidal shape, constituting a reservoir for the lubricant flowing out of the space between the threads of the female (2) and male (1) elements during tightening of the joint, characterised by the fact that said notch (13) has a length (X), measured parallel to the joint axis, between 4 and 10 mm, that it begins at a distance (L) from the abutment surface (15) of the female element, between 5 and 12 mm, and has a volume, expressed in mm3, in absolute value of at least 25 times the numerical value of the nominal external diameter (D), expressed in mm, of said male element (1).
Dependencies are inferred from the claim text.