Pipes and tubular conduits – End protectors – Threaded
Patent
1985-07-18
1989-01-10
Bryant, III, James E.
Pipes and tubular conduits
End protectors
Threaded
138 96R, F16L 5510
Patent
active
047966688
DESCRIPTION:
BRIEF SUMMARY
The device which is the subject of this invention relates to the protection, before use, of threadings and butt-type joint bearing surfaces which make-up threaded couplings between metallic tubes of circular cross-section and which contribute to the hermetic character of these couplings. This device relates to the threaded couplings of metallic tubes which are connected to each other in a direct manner or by means of threaded couplings or sleeves.
This device relates in particular to the protection of butt-type joint bearing surfaces and threadings of tubes used for the drilling of oil wells, or for the exploitation (tubing) of these wells, or even for the casing of these wells.
The threaded coupling described in FR No. 1 489 013 in particular is known among the different types of threaded couplings which have been developed. The butt-type joint bearing surface which should ensure the hermetic character of the joint has a concave frustoconical annular surface, worked at the male end of a tube, which comes to a stop against a convex frustoconical annular surface which is worked in the vicinity of the inner end of the female threading.
The hermetic character of the coupling depends on the quality of the threadings and the butt-type joint bearing surfaces, a quality which can be deteriorated either by impact, during transportation for example, or by corrosion, particularly on contact with salt water or other aggressive media.
Different devices have been proposed for protecting the joining regions of threaded tubes.
Patent Application DE-OS No. 2 834 489 describes an elastomeric or plastics protective cover which covers the outer threading of a tube. Inner raised regions, which are substantially parallel to the axis, ensure that the cover is held on the threads. The device can also be adapted to protect an inner threading.
This device is not intended for the protection of joint bearing surfaces and, not having a hermetic character, does not protect against corrosion.
Utility model DE-GBM No. 7 800 484.9 describes a protecting device for male or female frustoconical threadings at the ends of steel tubes, comprising a component of flexible material, such as an elastomer, to which there is connected a tubular reinforcing section of steel. The component of flexible material is provided with a frustoconical threading which threadingly engages the steel tube and comprises two sealing joints, one of which engages with the front end of the tube.
Such a device does not enable the butt-type joint bearing surfaces, such as the frustoconical bearing surfaces described in FR No. 1 489 013, to be effectively protected. Indeed, it is difficult to screw correctly the threads of a flexible material and it is difficult to control the tight compression of the joint onto the abutment regions. Finally, the flexibility of the material means that its protecting function with respect to the impacts received in the regions not covered by the reinforcing section, is poor.
Patent Application GB No. 2 093 426 describes a cover for protecting the outer tube threading. It comprises an outer sheath, preferably of steel, and an inner wall, preferably of impact-resistant plastics material. The inner wall is threaded so that it screws onto the outside of the tube. The extreme edge of the tube is protected by a rounded rim of the cover which covers it.
This device is not designed to protect the butt-type joint bearing surfaces, such as the frustoconical bearing surface against corrosion. Moreover, it does not have any means for ensuring protection against corrosion of the region covered by the cover. Finally it can not be used for the protection of the inner threadings of tubes.
A study has been made of producing a device which can ensure the effective protection against corrosion and impacts, before use, of threadings and butt-type joint bearing surfaces, which make-up threaded couplings of metallic tubes. A study in particular has been made of the possibility of protecting the inner or outer threadings and the butt-type joint bearing surfaces
REFERENCES:
patent: 2258066 (1941-10-01), Oyen
patent: 2930118 (1960-03-01), Higgins
patent: 3578200 (1971-05-01), Hetzer
patent: 4157100 (1979-06-01), Turk
patent: 4210179 (1980-07-01), Galer
patent: 4487228 (1984-12-01), Waldo et al.
patent: 4582090 (1986-04-01), Chose et al.
Bryant III James E.
Vallourec
LandOfFree
Device for protecting threadings and butt-type joint bearing sur does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for protecting threadings and butt-type joint bearing sur, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for protecting threadings and butt-type joint bearing sur will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2103228