Thread joint for tube

Details Thread joint for tube Thread joint for tube

1995-10-17

1997-07-22

Nicholson, Eric K.

Pipe joints or couplings

Particular interface

Tapered

285355, 2853344, F16L 2500

Patent

active

056497253

ABSTRACT:
A thread joint for a tube which suppresses galling without deteriorating its sealing performance since a sliding distance L.sub.S which expresses a quantity of spiral sliding of sealing portions relative to each other during a tightening period from the start of a contact between the sealing portions until shoulder portions abut each other satisfies the following relationship:
Sliding Distance L.sub.S .ltoreq.-0.0093.times. (Tube Outer Diameter).sup.2 +4.73.times. (Tube Outer Diameter).
To shorten the sliding distance L.sub.S, the sealing portion of a box portion is formed shorter than the sealing portion of a pin portion. In this case, a circumferential groove may be formed to discharge a dope. Conversely, the sealing portion of the pin portion is formed shorter than the sealing portion of the box portion. In this case, a precedent-stage unthread portion whose inclination is smaller than that of the sealing portion of the pin portion is formed between a male thread and the sealing portion of the pin portion. In addition, tapers of the sealing portions of the pin portion and the box portion are set at 1/6 or larger, and/or, a distance where the sealing portion of the box portion (pin portion) is formed so as to contact a curve which is tangent to the sealing portion of the pin portion (box portion) is 1.45 mm or larger.

REFERENCES:
patent: 3359013 (1967-12-01), Knox et al.
patent: 3856337 (1974-12-01), Ehm et al.
patent: 4153283 (1979-05-01), Hellmund et al.
patent: 4384737 (1983-05-01), Reusser
patent: 4619472 (1986-10-01), Kozono et al.
patent: 4623173 (1986-11-01), Handa et al.
patent: 4736962 (1988-04-01), Mott et al.
patent: 4795200 (1989-01-01), Tung
patent: 4958862 (1990-09-01), Cappelli et al.
patent: 4984829 (1991-01-01), Saigo et al.
patent: 5137310 (1992-08-01), Noel et al.
patent: 5423579 (1995-06-01), Blose et al.

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