A pipe fitting system, including a first pipe section with at least one male end, a second pipe section with at least one female end, and a connecting means for releasably connecting the pipe sections together such that the male end is at least partially received within the female end. The connecting means comprising releasably engageable first and second connectors associated with the first and second pipe sections respectively, wherein the first connector comprises at least one outwardly extending protrusion and wherein the second connector comprises corresponding recesses adapted to releasable receive the or each protrusion of the first connector. The pipe fitting system is suitable for applications such as end of line connections, repair/replacement of fixed existing pipes, and in enabling temporary removal of pipes for maintenance or access purposes.

A pipe loosening device and methods are shown. In one example, the pipe loosening device enables a method wherein a pipe to be replaced is deformed but not burst, and a portion of a sidewall of the pipe is forced outward into the surrounding soil to compact a local region of the surrounding soil and loosen the existing pipe. The pipe may then pulled from the ground along an axis of the pipe.

A device for repairing pipe leakage takes the form of a short section of PVC pipe with fittings. The pipe is ideally a 1′-2′ section fashioned into a U-bend with a substantially semi-circular bend and two arms, and the fittings take the form of an elbow joint glued onto each arm. The arms are ideally offset up to 5° from parallel. A method of repairing cracked PVC piping using the device involves cutting out a 4″-6″ section of piping, gluing the exposed ends of the broken piping as well as the elbow joints, squeezing the U-bend, positioning the squeezed device into the gap in broken piping, and releasing the U-bend to fit the elbow joints over the exposed ends of broken piping. The device has no vulnerable moving parts or O-rings, and it obviates the need to remove entire pipes.

The present invention discloses a stainless-steel tee-pipe moulding process, cutting out a main pipe and a secondary pipe from the stainless-steel pipe to replace the copper tee-pipe to resolve the problem that the copper tee-pipe is easy to corrode and causes water pollution; meanwhile, the moulding process of the stainless-steel tee-pipe of the invention is different from the traditional integral forming process, and saves more materials and reduces the production cost compared with the traditional integral forming process.

A pipe fitting system, including a first pipe section with at least one male end, a second pipe section with at least one female end, and a connecting means for releasably connecting the pipe sections together such that the male end is at least partially received within the female end. The connecting means comprising releasably engageable first and second connectors associated with the first and second pipe sections respectively, wherein the first connector comprises at least one outwardly extending protrusion and wherein the second connector comprises corresponding recesses adapted to releasable receive the or each protrusion of the first connector. The pipe fitting system is suitable for applications such as end of line connections, repair/replacement of fixed existing pipes, and in enabling temporary removal of pipes for maintenance or access purposes.

A coupling can include a coupling body having an axis, an axial length, an axial center, axial ends and an inner surface comprising an inner diameter that is substantially constant over an entirety of the axial length. A single shoulder can protrude radially inward relative to the axis from the inner surface, such that the inner surface has no other shoulders. In a version, the single shoulder is not axially aligned with the axial center of the coupling body.

A repair welding method according to at least one embodiment is for a member in which a first end and a second end of a parent material are connected by welding and includes: a step of removing a portion including at least a part of a first heat-affected zone of an existing welded portion of the member; and a step of performing repair welding after removing the portion. In a cross-section including the parent material and the existing welded portion, all intersection portions between the first heat-affected zone of the existing welded portion and a second heat-affected zone due to the repair welding have an intersection angle between the first heat-affected zone and the second heat-affected zone of 70° to 110°.

A rehabilitated pipe system and a method for rehabilitating a pipe system. A lines a host pipe and a coupling member configured for being operatively coupled to a mechanical coupler is positioned adjacent the host pipe so that a connecting section of the liner extends into the coupling member. The connecting section of the liner is adhesively bonded to the coupling member, and the mechanical coupler is installed to fluidly couple the liner to another fluid conducting structure. The connecting section of the liner can be formed in a portion of the host pipe that is removed after lining. The coupling member can be flanged or include a lateral coupling tube. The mechanical coupler can, e.g., be a ductile iron coupler or a bolt.

A pipe loosening device and methods are shown. In one example, the pipe loosening device enables a method wherein a pipe to be replaced is deformed but not burst, and a portion of a sidewall of the pipe is forced outward into the surrounding soil to compact a local region of the surrounding soil and loosen the existing pipe. The pipe may then pulled from the ground along an axis of the pipe.

A universal device for replacing worn or lacerated parts of connecting conduits between components of climate control or cooling or hydraulic systems for the connection between components of new climate control or cooling or hydraulic systems, comprising a metal sleeve provided at an end of a coupling for pipes joined to it in a sealed fashion, designed to be fitted and clamped on a stretch of rigid pipe joined to a connector for connection of the connecting conduit to a component, and at the other end of a fitting for connection with a flexible hose designed to replace the worn or lacerated connecting conduit. The sleeve can be rectilinear or curved with angle of approximately 45 or approximately 90. The previous device is prepared in a kit according to different sizes.