摘要:
A threaded joint (10, 20) comprises a coupling (3), a first pin (1, 1'), and a second pin (2, 2'), wherein the thread of the first pin (1, 1') has a pitch different from the pitch of the thread of the second pin (2, 2'). The extremities of the pins (1, 1', 2, 2') have slanted contact surfaces (11, 12) of complementary shape that make mutual contact after make-up of the joint. The slanted common plane of contact of both pins (1, 1', 2, 2') has an angle (α) to the plane perpendicular to the longitudinal axis (X) of the joint which is greater than 0°. In an alternative embodiment the contact surfaces of the pins (1, 1', 2, 2') are split into two staggered planes (7, 17, 9, 19) and comprise a seal inbetween.
摘要:
A high-strength threaded joint, preferably for lined tubes, comprising: - a coupling (1) with a threaded inner surface along its whole length with ends defined as female; and - a pair of tubes (T), each of them having ends (2), defined as male, with an external threaded surface and a thread-free end defined as a nose (N); said joint having an B round API thread profile (3), according to standard API 5B, with a diameter interference from 0 to 2 mm;
where each of said noses (N) comprising: - an upper portion formed by a thread bevel (B) with a slope of substantially 65 degrees, I which continues on a first rounded area (51) with a first radius of curvature (R1) of 1.5 mm; and - a lower portion including a second rounded area (92) with a second radius of curvature (R2) of 1.5 mm; said thread bevel overlapping (B) with said thread (3) and said first rounded area (S1) extending from said thread bevel (B) up to a point of its curvature where a tangential line is perpendicular to the longitudinal axis (X) of said tube (T), and said second rounded area extending (S2) from a point of its curvature where a tangential line is perpendicular to the longitudinal axis (X) of said tube (T) up to the inner surface of said tube (T)
摘要:
A composable pipework (10) having a plurality of modular tubolar ducts (11, 111, 211, 311) interconnected by means of a hermetic seal, head-tail connection, comprising a plurality of modular tubolar ducts (11, 111, 211, 311) and hermetic sealing means (18) provided in each head-tail connection of said tubular ducts (11, 111, 211, 311), each tubular duct (11, 111, 211, 311) comprising at least two ends (14, 114, 314; 16, 316a, 316b) equipped with respective threads (15, 115; 17) capable of allowing said hermetic seal, head-tail connection through screwing; at said hermetic seal, head-tail connections, the respective tubular ducts (11, 111, 211, 311) are rotatable between themselves through screwing.
摘要:
A sealant is provided that possesses many or all of the characteristics of conventional thread sealants, and allows application with improved smoothness and uniformity of application. Sealants in accordance with the invention utilize engineered fibers such as melamines like Basofill and polyaramids such as Kevlar in its composition. Engineered fibers offer consistency and uniformity that other previously used sealants lack. Engineered fibers can improve the gap filling characteristics of the sealant, as well as the resistance of the sealant to chemicals and high pressures. Engineered fibers tend to have very high strength and low density.
摘要:
Pipe integral threaded joint formed by a male element (1) and a female element (2) respectively placed on the external surface and on the internal surface of two truncated cone-shaped parts of the threading (6, 7, 8, 9) having the same conicity value and being radially spaced, both being respectively divided by annular shoulders (5, 5') which are parallel and orthogonal with respect to the pipe axis. They are provided two sealing surfaces (12, 12', 13, 13'), one of them being cone-shaped and the other being spherical. After the screwing of the two elements (1, 2) said two annular shoulders (5, 5') are in contact. Each male (1) and female (2) element comprises, respectively along its external and internal surface, a circumference cavity (14, 15) placed between a part of the threading and the annular shoulder (5, 5') in order to allow the expansion of the lubricating fat.
摘要:
A threaded connection for improving fatigue resistance to cyclic loading is disclosed. The threaded connection (10) basically comprises a pair of interlocking members (12, 16) having corresponding radially inner (52) and radially outer (50) spiral threads thereon, each spiral thread including a spiral compression flank (56, 68) and a spiral tension flank (58, 64) wherein at least one of the spiral compression flanks (56, 68) and spiral tension flanks (58, 64) on the inner spiral threads are in planar engagement with a corresponding spiral compression flank (56, 68) and spiral tension flank (58, 64) on the outer spiral thread. Axial spacing between the tension flanks (58, 64) and the compression flanks (56, 68) on the radially inner and radially outer spiral threads further define a stress reducing spiral root surface (60, 62) on at least one of the radially inner (52) and radially outer (50) threads and a corresponding crest surface (54, 66) on the other radially inner and radially outer spiral threads.
摘要:
A packing sleeve for thread connections, comprising a substantially annular body and a cuff, wherein, according to the invention, for the universal use of the packing sleeve (3) the annular body (4), by design and material selection, forms a stiff stop ring (4) for upsetting the cuff (5) and for permitting the packing sleeve (3) to be gripped by hand or with tools, and the cuff (5) is flexible. The invention further provides a method of effecting a sealing thread connection with the packing sleeve (3) according to the invention.
摘要:
Garniture d'étanchéité (10) pour assurer l'étanchéité d'un raccordement fileté, consistant en un cône tronqué en téflonR dont l'extrémité avec le diamètre le plus petit est insérée dans la partie femelle du raccordemnt tandis que l'extrémité avec le plus grand diamètre est insérée dans la partie mâle du raccordement. En vissant les deux parties filetées ensemble, on modifie la forme de la garniture d'étanchéité qui s'adapte à celle des deux pas de vis; on obtient ainsi un raccordement étanche à l'eau à la fois sûr et stable.
摘要:
Un raccord (10) pour tubes en fibre de verre (12, 14) comporte des filetages mâle et femelle s'appariant égrisés ou trusquinés dans les extrémités des tubes (12, 14) à raccorder. Au moins une des surfaces filetées, égrisées comporte un contact à filetage (16) à pâte moulé dans celle-ci, de sorte que la racine ou la base du filetage à pâte soit en-dessous de la crête du filetage égrisé. Lors de l'appariage des extrémités des tubes accouplés, la surface (16) du filetage à pâte assure une finition lisse et un couple d'engrènement et de désengrènement stable relativement bas. Les saillies chevauchées des filetages mâle et femelle égrisés assurent un verrouillage mécanique et par voie de conséquence une résistance à la traction améliorée dans le raccord.