A restraint system for use in securing temporary flow lines that include multiple pipe sections, each pair of pipe sections connected together with a fitting or coupling such as a hammer joint coupling. The system includes multiple pluralities of endless loop slings connected end to end with a cow hitch or girth hitch knot. Disconnectable fittings (e.g., shackles) are placed every three or more slings so that easy disassembly is afforded in case of leakage or other failure.

A restraint system for use in securing temporary flow lines that include multiple pipe sections, each pair of pipe sections connected together with a fitting or coupling such as a hammer joint coupling. The system includes multiple pluralities of endless loop slings connected end to end with a cow hitch or girth hitch knot. Disconnectable fittings (e.g., shackles) are placed every three or more slings so that easy disassembly is afforded in case of leakage or other failure.

A boiler tube reinforcement device reinforces a boiler tube including a weld portion. The reinforcement device includes: a strip-shaped first steel plate that is wound and fixed by welding in a region including the weld portion of the boiler tube; a first reinforcement member in surface contact with an outer peripheral surface corresponding to one semi-circumference of the boiler tube in an outer peripheral surface of the first steel plate wound around the boiler tube; a second reinforcement member in surface contact with an outer peripheral surface corresponding to another semi-circumference of the boiler tube in the outer peripheral surface of the first steel plate wound around the boiler tube, wherein the second reinforcement member covers the outer peripheral surface of the first steel plate together with the first reinforcement member; and a coupling member that couples the first reinforcement member and the second reinforcement member together around the boiler tube.

A method for constructing a tubular connection assembly includes forming a first tubular having a first inner diameter, a first wall thickness, and a first connection end, forming a second tubular having a second inner diameter, a second wall thickness, and a second connection end, and increasing the first wall thickness of the first connection end, increasing the first inner diameter of the first connection end, increasing the second wall thickness of the second connection end, and increasing the second inner diameter of the second connection end. The first tubular and the second tubular are attached at a weld point between the first connection end and the second connection end so as to form a tubular connection assembly with a target amount of fatigue performance. A metallic riser, such as a steel catenary riser or a steel lazy wave riser, can be formed of a plurality of tubular connection assemblies.

A method for constructing a tubular connection assembly includes forming a first tubular having a first inner diameter, a first wall thickness, and a first connection end, forming a second tubular having a second inner diameter, a second wall thickness, and a second connection end, and increasing the first wall thickness of the first connection end, increasing the first inner diameter of the first connection end, increasing the second wall thickness of the second connection end, and increasing the second inner diameter of the second connection end. The first tubular and the second tubular are attached at a weld point between the first connection end and the second connection end so as to form a tubular connection assembly with a target amount of fatigue performance. A metallic riser, such as a steel catenary riser or a steel lazy wave riser, can be formed of a plurality of tubular connection assemblies.

A rigid riser system including a rigid riser and one or more fatigue performance enhancers. The rigid riser includes a plurality of rigid metal sections welded together to form a plurality of girth weld joints. The one or more fatigue performance enhancers are positioned over one or more of the plurality of girth weld joints of the rigid riser to enhance the fatigue resistance and/or fatigue life. The body of the fatigue performance enhancer may include a central region and two end regions with the central region having a greater average radial cross-sectional thickness than each of the end regions. Methods of enhancing fatigue performance of the rigid riser and fatigue performance enhancers are also disclosed.

A rigid riser system including a rigid riser and one or more fatigue performance enhancers. The rigid riser includes a plurality of rigid metal sections welded together to form a plurality of girth weld joints. The one or more fatigue performance enhancers are positioned over one or more of the plurality of girth weld joints of the rigid riser to enhance the fatigue resistance and/or fatigue life. The body of the fatigue performance enhancer may include a central region and two end regions with the central region having a greater average radial cross-sectional thickness than each of the end regions. Methods of enhancing fatigue performance of the rigid riser and fatigue performance enhancers are also disclosed.

A tube arrangement includes a first metal tube provided with a first outer threading in an end region thereof, a second metal tube provided with a second outer threading in an end region thereof, a first butt weld joining the end regions of the first and second tubes, and a sleeve provided on the outside of first and second metal tubes forming a thread coupling with the outer threading of the first and second tubes. The present disclosure also relates to a method of producing the tube arrangement, in which a first tube is joined with a second tube, both the first tube and the second tube being metal tubes. A furnace having a chamber, which is provided with a burner arrangement for generating heat and a tube arrangement for conduction of a hot gas or steam through the furnace, is also provided.

A tube arrangement includes a first metal tube provided with a first outer threading in an end region thereof, a second metal tube provided with a second outer threading in an end region thereof, a first butt weld joining the end regions of the first and second tubes, and a sleeve provided on the outside of first and second metal tubes forming a thread coupling with the outer threading of the first and second tubes. The present disclosure also relates to a method of producing the tube arrangement, in which a first tube is joined with a second tube, both the first tube and the second tube being metal tubes. A furnace having a chamber, which is provided with a burner arrangement for generating heat and a tube arrangement for conduction of a hot gas or steam through the furnace, is also provided.

A welding method, to reduce tension due to pipe stretching, for a downhole double-walled insulated pipe is disclosed. The pipe comprises an inner tube, an outer tube, steel spacer rings and insulated material fitted filling the annular space. Special welding links the ends of inner and outer tubes, forming a flexible metallic joint, achieved through the use of filler metal with specific chemical composition during the welding process. The inner tube is heated and extended before the tube welding is performed. The welded joint is strong enough to keep the inner tube in place when it cools down, creating a tension inwards in the tube. This way, when steam flows through the tubing during the operation, the heat stretches the inner tube until the tension direction is outwards, then the tension now becomes about half of the normal tension applied to the tube welded joint with the usual welding process.