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1. US20040130152 - Pressure relieved thread connection

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

Claims

1. A pin and/or box thread connector having a fluid flow passage for use in relieving fluid pressure contained between threads in an engaged connection comprising a groove cut in a crest of a thread of said pin and/or said box.
2. A thread connector as defined in claim 1 wherein said groove includes an arcuate cross section.
3. A thread connector as defined in claim 1 wherein said groove is cut in said crest approximately midway between thread flanks on either side of said crest.
4. A thread connector as defined in claim 1, further comprising:
a thread tooth formed by a load flank and a stab flank on either side of said crest,
said load flank having a surface inclined to a central axis of said connector at a load flank angle,
said stab flank having a surface inclined to a central axis of said connector at a stab flank angle, and
said groove cut at a point on said crest at an intersection of said crest with a bisector of an angle defined by an intersection of a line lying within said load flank surface and a line lying within said stab flank surface.
5. A thread connector as defined in claim 4 wherein said stab flank surface includes a line inclined to said central axis at an angle of 90 degrees.
6. A thread connector as defined in claim 1 wherein said threads comprise wedge threads.
7. A thread connector as defined in claim 1 wherein said threads comprise dovetail wedge threads.
8. A thread connector as defined in claim 4 wherein at least a portion of each of said load flanks and said stab flanks is inclined to said central axis at an angle greater than 90 degrees.
9. A thread connector as defined in claim 4 wherein at least a portion of each of said load flank and said stab flank is inclined to said central axis at an angle less than 90 degrees.
10. A thread connector as defined in claim 1, further comprising:
a threadedly engaged pin and box having an engaged threaded area including said thread,
a thread lubricant disposed in said engaged threaded area,
solid particles contained in said thread lubricant, and
a lubricant escape passage defined by said fluid flow passage and said engaged pin and box in said engaged threaded area, said lubricant escape passage having a diametrical cross sectional dimension whose smallest value is greater than the largest diametrical cross sectional dimension of the largest of said solid particles in said thread lubricant.
11. A connector as defined in claim 2, further comprising:
a thread tooth formed by a load flank and a stab flank on either side of said crest, and
a bevel connecting a flank of said thread with said crest of said thread tooth for forming a second fluid flow passage for use in relieving fluid pressure contained between threads in an engaged connection.
12. A connector as defined in claim 1, further comprising multiple grooves formed in said thread crest.
13. A connector as defined in claim 11, further comprising multiple grooves formed in said thread crest.
14. A connector as defined in claim 11, further comprising a second bevel connecting a flank of said thread with said crest of said thread tooth.
15. A connector as defined in claim 10 wherein said lubricant escape passage has no diametrical cross sectional dimensions smaller than 0.006 in.
16. A thread connector as defined in claim 10 further comprising a seal area, intermediate ends of said thread, devoid of said fluid flow passage, for forming a metal-to-metal seal with said thread.
17. A thread connector as defined in claim 10 further comprising internal and external metal-to-metal seals formed at axially spaced areas adjacent said engaged threaded area.
18. A thread connector having a fluid flow passage for relieving fluid pressure contained between engaged pin and box thread teeth in a connected pin and box, comprising a bevel surface formed at the intersection of a thread crest and a thread flank of one of said pin thread tooth or said box thread tooth whereby a flow passage may be formed between said bevel surface and a thread root-to-flank intersection of said box thread tooth or said pin thread tooth, respectively.
19. A thread connector as defined in claim 18 wherein said fluid flow passage has no diametrical cross sectional dimensions smaller than 0.006 in.
20. A thread connector as defined in claim 18 further comprising a groove cut in said thread crest.
21. A thread connector as defined in claim 18 further comprising a seal area intermediate ends of said thread teeth devoid of said fluid flow passage for forming a metal-to-metal seal between said thread teeth.
22. A thread connector as defined in claim 18 further comprising internal and external metal-to-metal seals.