Abstract: Implementations described and claimed herein provide systems and methods for extending reach in a wellbore in oil well operations. In one implementation, a first coiled tubing string has a first coil interior surface, and a second coiled tubing string is disposed within the first coiled tubing string and has a second coil exterior surface. An annulus is defined by the first coil interior surface and the second coil exterior surface. The annulus is sealed proximal to a top end of the first coiled tubing string via a first seal and sealed proximal to a bottom end of the first coiled tubing string via a second seal. A fluid is sealed within the annulus at a pressure.

Abstract: A dual containment fitting may include a primary tubing, a secondary tubing, and a dual containment body. The secondary tubing may surround and be concentric with a first portion of the primary tubing forming a first leak containment space between the primary tubing and the secondary tubing. The dual containment body may include a flare fitting portion and a primary containment nut portion. The flare fitting portion may surround and be concentric with the primary tubing forming a second leak containment space between the primary tubing and the flare fitting portion. The primary containment nut portion may surround and be concentric with the flared end of the primary tubing forming a third leak containment space between the primary tubing and the primary containment nut portion. The primary containment nut portion may include at least one leak passage hole connecting the third leak containment space with the second leak containment space.

Abstract: A method and apparatus for securing a flexible pipe to a further flexible pipe in an end-to-end configuration, wherein the apparatus includes and the method utilizes an elongate tubular element having a first and second end and an outer surface having a raised central region. At least one vent passage extends at least partially across the raised central region.

Abstract: Various roof vent adaptors are disclosed. The roof vent adaptors can be used to seal penetrations on buildings, such as vent penetrations on metal or non-metal roofs. In various embodiments, the roof vent adaptor includes a sealing member, an outer securing unit and an inner securing unit. The roof vent adaptor can be secured to the roof to provide a generally liquid-tight seal around the roof vent, thereby inhibiting or preventing water intrusion into the building.

Abstract: Test flange assemblies comprise a flange body and a piston. The piston is configured to translate relative to the flange body and has an outer surface facing away from the flange body and an inner surface facing toward the flange body. The outer surface defines a circular seal channel for receiving a seal structure between the piston and a flange surface of a flanged component. The outer surface radially inward from the circular seal channel has a surface area that is less than a surface area of the inner surface. Methods of testing pressure containing structures comprise operatively positioning the test flange assembly, positioning a seal structure within the circular seal channel of the piston, coupling the flange body to a flanged component, and pressurizing a volume between the piston and the flange body so that the piston compresses the seal structure between the piston and the flanged component.

Abstract: A wellhead seal device forms metal seals in an annular space between inner and outer tubular members such as a rough casing held within aligned casing and tubing heads. An annular metal sealing sleeve has a lower portion seated in the annular space, and an upper portion which forms an inner sealing annulus adjacent the outer wall of the inner tubular member. A metal seal ring and a wedge ring are located in the inner sealing annulus. A retaining ring is retained by the upper portion above the wedge ring. Threaded seal energizing members extend through the retaining ring to push downwardly on the wedge ring and compress the metal seal ring radially inwardly to form a metal seal to the inner tubular member and thus seal the inner sealing annulus. The lower portion of the annular metal sealing sleeve may seal to the casing head and to the casing.

Abstract: To provide a connecting structure of a double tube and an assembling or disassembling method of the double tube capable of disassembling or repairing an inner tube without cutting an outer tube. A connecting structure (10A) includes an outer tube (11) and an inner tube (12). The outer tube (11) is provided at a location corresponding to a connection flange portion (13) of the inner tube (12) with an outer tube short cylinder (15) including openings (14) each having a lid (14a). The outer tube short cylinder (15) is provided at respective ends with outer tube connection flange portions (16A and 16B). There are provided push-up bolts (21) capable of adjusting gaps respectively between an outer tube connection flange portions (17A-1 and 17A-2) which are opposed to each other, and between an outer tube connection flange portions (17B-1 and 17B-2).

Abstract: A wall bushing for an air-conditioner comprises an external pipe and an internal pipe. The cross section of the external pipe is a “sports ground” shape, and an inner circular wall of the external pipe is tangential to an outer circular wall of the internal pipe. An end of the internal pipe is connected to an air outlet port of the air conditioner, and an end of the external pipe is connected to an air inlet port.

Abstract: A seal arrangement for providing a seal between a nuclear reactor in-core instrument housing and an instrument contained within the housing includes a lower seal assembly surrounding an outer portion of the in-core instrument housing, an upper seal assembly surrounding an outer portion of the in-core instrument, a seal housing enclosing the lower and upper seal assemblies, and lower and upper compression assemblies positioned on respective ends of the seal housing. The compression assemblies each include a drive nut and a compression collar. The compression collars engage and apply an axial load on the seal assemblies to maintain a reliable seal between the seal housing and the outer portion of the in-core instrument housing, and between the seal housing and the outer portion of the in-core instrument.

Abstract: An elastomeric gripping element is supported and mounted by a housing and is configured to have an interference fit under normal conditions with the surface of the object to be gripped. The housing and the surface to be gripped are separated by a gap. For gripping mating with the surface, the elastomeric gripping element is initially stretched by operative means in the housing element in an axial direction parallel to the generating element of the comating surface to be gripped, with an attendant reduction in its cross-sectional thickness perpendicular to the direction of stretch. In this manner, the gripping element interference with the comating surface of the object to be gripped is minimized or eliminated for installation. When positioning for the installation mating is accomplished, the gripping element tension is selectively released, permitting the gripping element to attempt to return to an unstretched position and thereby to assume a preloaded position against the comating surface.