A metal seal fitting for use on a pipe or pipeline includes at least one metal seal ring having a C-profile which houses a spring and is arranged concentric to, and outside of, a tap diameter of the access connection. The seal ring is double-curved so that it conforms to a pipe-facing side of the fitting. A surface of the pipe is prepared to receive the seal and, as the fitting is being secured to the pipe, the seal is activated and spring-energized. In its final sealing state, the seal is not compressed passed its deformation point and maintains its spring-back capability. After the fitting is removed from the pipe, the seal may be re-used. The metal seal fitting is suited for applications requiring a high integrity seal and can be used in high pressure, high temperature, and highly corrosive environments which are not well-suited for elastomeric seals.

A method for limiting fitting distortion when welding a fitting to an in-service pipeline—where the fitting includes a thick, longitudinally extending, seam located between fitting halves—involves welding, on each side of the fitting, a middle third section of the seam in a pyramid-like fashion using an inward progression starting from an end of the middle third section along a profile of a seam bevel, and welding outer third sections of the seam using an outward progression from an end adjacent to the middle third section along a profile of the seam bevel. The welding of each of the three sections per side includes a temper bead welding technique of at least two layers to provide stress relief in lieu of traditional post weld heat treatment.

A method for limiting fitting distortion when welding a fitting to an in-service pipeline—where the fitting includes a thick, longitudinally extending, seam located between fitting halves—involves welding, on each side of the fitting, a middle third section of the seam in a pyramid-like fashion using an inward progression starting from an end of the middle third section along a profile of a seam bevel, and welding outer third sections of the seam using an outward progression from an end adjacent to the middle third section along a profile of the seam bevel. The welding of each of the three sections per side includes a temper bead welding technique of at least two layers to provide stress relief in lieu of traditional post weld heat treatment.

A system disclosed herein comprises a pipeline and a plurality of access node structures axially spaced apart from one another along the pipeline, wherein each of the plurality of access node structures comprises a substantially planar upper surface. Also disclosed is a method for deploying a pipeline that comprises a plurality of future access node structures, wherein, at the time the pipeline is deployed subsea, the future access node structures prevent access to an interior of the pipeline, and wherein the plurality of access node structures comprises at least one of a tapping structure, a pressure-barrier retaining structure that is adapted to receive a pressure-barrier device and a pressure-barrier retaining structure comprised of a recess with a scored pressure-retaining bottom.

A system for reliable coupon retrieval when hot-tapping a fluid line, and a method of hot-tapping the fluid line using the system. The system includes an insertion member and a receiver, each configured to matingly engage with the other. The insertion member may be secured to a pipe carrying a fluid to be hot-tapped, and the receiver may be secured to a drill with a hole saw attached thereto. During use, as the drill approaches the insertion member, the insertion member enters the receiver and is secured in place by a securement mechanism. The hole saw cuts the piping, and the insertion member is detached from the pipe, with the coupon attached to the insertion member, to safely and reliably retrieve the coupon during the hot-tapping process.

A missile flow line is assembled in a frac manifold to manifold the discharge from a plurality of pumps. The missile comprises at least two junction fittings joined by a flange union to at least one spooled pipe to form a conduit. The junction fittings comprise a fitting body having a primary bore and at least two feed bores. The primary bore extends axially through the body between primary union faces adapted for connection to a flowline component by a flange union. The feed bores extend radially through the body from a feed union face to an intersection with the primary bore. The feed union faces are adapted for connection to pump discharge lines by a flange union. The intersections of the feed bores with the primary bore are offset axially from each other along the primary bore.

A missile flow line is assembled in a frac manifold to manifold the discharge from a plurality of pumps. The missile comprises at least two junction fittings joined by a flange union to at least one spooled pipe to form a conduit. The junction fittings comprise a fitting body having a primary bore and at least two feed bores. The primary bore extends axially through the body between primary union faces adapted for connection to a flowline component by a flange union. The feed bores extend radially through the body from a feed union face to an intersection with the primary bore. The feed union faces are adapted for connection to pump discharge lines by a flange union. The intersections of the feed bores with the primary bore are offset axially from each other along the primary bore.

The present disclosure provides a fluid introducer for a piping system that includes first and second piping sections. The fluid introducer provides a direct connection to the first piping section through a separator body configured to be positioned in an expansion gap between the first piping section and the second piping section such that a first end face of the separator body faces the first piping section and a second end face of the separator body faces the second piping section. The fluid introducer is configured to direct fluid from the fluid source through fluid introduction passaging into the first piping section and block the fluid from flowing into the second piping section.

A pipe fitting placement system includes a fitting holder including a bar defining a fitting bore proximate to a first end of the bar, the bar further defining a second end distal from the first end, the bar being elongated in a longitudinal direction extending from the first end to the second end; and a saddle coupled to the bar proximate to the second end of the bar, the saddle rotatable about a saddle pivot axis with respect to the bar; and a pipe fitting received within the fitting bore of the fitting holder.

The present disclosure discloses a pipeline connection mechanism. The pipeline connection mechanism includes a first pipe section, a second pipe section, a third pipe section and a punching mechanism; one end of the first pipe section is fixed on an original pipeline, and the other end of the first pipe section is detachably connected with the second pipe section; and the second pipe section is detachably connected with the third pipe section or the punching mechanism; the third pipe section communicates with an additional pipeline; and the punching mechanism passes through the first pipe section as well as the interior of the second pipe section, and punches the original pipeline. The additional pipeline may communicate with the original pipeline without changing a structure of the original pipeline, and thus the assembly is convenient.