A pipeline construction usable for internally insulating a welded joint between pipes with an internal protective coating. A device for internally insulating a welded pipeline joint includes a sealing assembly including a cylindrical housing and a coaxially-fastened cylindrical working member that radially expands upon generation of excess pressure in a cavity thereof. Inside the housing are a sealing compound feed assembly, a dosing device formed by a piston assembly for sealing compound components, and a pneumatic control assembly. In the dosing device, working cavities for each component are connected to the feed assembly. The elastic working member has a conduit connected to the feed assembly for feeding sealing compound into an annular gap in a welded joint region, and a conduit for pumping air out of the gap. The pneumatic control assembly controls dosing device and feed assembly functioning and generates excess air pressure in the working member cavity.

A sleeve is provided for covering a pipe joint formed between two pipes that are coupled to one another to form a tube. The sleeve comprises a heat-shrinkable material that is configured to conform to the first and second pipes when heated to cover the pipe joint.

The present invention provides a metal pipe coated on at least a section of the metal pipe with a polyolefin coating system, wherein the system consists of the following layers: (a) optionally, a corrosion protective layer of a chromate, phosphate or other salt; (b) a polyolefin based adhesive, preferably in a thickness of 0.3-5 mm; (c) a PE or PP coating layer, preferably in a thickness of 1-10 mm; (d) optionally, an adhesion promoting layer between the polyolefin based adhesive and a PE or PP layer; wherein the polyolefin based adhesive contains an organic phase consisting of substantially saturated hydrocarbons, and wherein the adhesive contains amorphous polypropylene, ethylene-propylene copolymers or poly(iso)butylene (co)polymers, said adhesive being flowable when a pressure of 10 kgf/cm.sup.2 is applied, wherein the PE or PP coating is a continuous layer over the coated section, and wherein said polyolefin based adhesive adheres to both the metal pipe and to said PE or PP coating.

An apparatus for shrouding the coated field joint area of connected line pipe segments, the shroud having first and second housing halves which have end walls which cooperate to form registering openings matching the diameter of the pipe to be shrouded, the housing halves forming a chamber. The housing can be of a clamshell design, being hinged on one side and having hasps, latches or the like on the other side to keep the shroud positioned once it is placed around the coated field joint area of a pipeline. An environment monitor is disposed in the chamber to measure conditions such as relative humidity and temperature.

The present invention provides a metal pipe coated on at least a section of the metal pipe with a polyolefin coating system, wherein the system consists of the following layers: (a) optionally, a corrosion protective layer of a chromate, phosphate or other salt; (b) a polyolefin based adhesive, preferably in a thickness of 0.3-5 mm; (c) a PE or PP coating layer, preferably in a thickness of 1-10 mm; (d) optionally, an adhesion promoting layer between the polyolefin based adhesive and a PE or PP layer; wherein the polyolefin based adhesive contains an organic phase consisting of substantially saturated hydrocarbons, and wherein the adhesive contains amorphous polypropylene, ethylene-propylene copolymers or poly(iso)butylene (co)polymers, said adhesive being flowable when a pressure of 10 kgf/cm.sup.2 is applied, wherein the PE or PP coating is a continuous layer over the coated section, and wherein said polyolefin based adhesive adheres to both the metal pipe and to said PE or PP coating.

A method of joining a non-metallic pipe to a metallic pipe. The pipe may be wrapped with one or more sheets of reinforcement material (e.g., pre-impregnated fiberglass, carbon fiber, or aramid fiber) and then fitted with an adapter or fitting that is connectable to a metallic pipe. The reinforcement material may be heated using a heating apparatus which allows the material to bond to the pipe to strengthen the joint.

A welded connection kit for joining first and second lined pipes together includes a coupling sleeve to connect the first and second pipes together. The coupling sleeve has a thermal break in it. The coupling sleeve includes a first coupling member that attaches to the first pipe and a second coupling member that attaches to the second pipe. The first and second coupling members attach to each other to connect the first and second pipes. A first liner lines the first pipe and includes a first flange. A second liner lines the second pipe and includes a second flange. The first and second coupling members compress the first and second flanges together to form a fluid seal.

A welded connection kit for joining first and second lined pipes together includes a coupling sleeve to connect the first and second pipes together. The coupling sleeve has a thermal break in it. The coupling sleeve includes a first coupling member that attaches to the first pipe and a second coupling member that attaches to the second pipe. The first and second coupling members attach to each other to connect the first and second pipes. A first liner lines the first pipe and includes a first flange. A second liner lines the second pipe and includes a second flange. The first and second coupling members compress the first and second flanges together to form a fluid seal.

A pipeline having a series of interconnected pipe sections forming Field Joints, each pipe section having a coating with a thermal insulation layer which extends over a substantial portion of a length of the pipe section, and an anti-corrosion layer situated underneath the thermal insulation layer. The pipeline has a Field Joint Coating (FJC) at connection regions where ends of the adjacent pipe sections are interconnected. Each FJC has an anti-corrosion coating layer, an intermediate coating layer of a thermoplastic material which covers the anti-corrosion coating layer, and a FJC thermal insulation layer which covers the intermediate coating layer.

A flame coating machine for coating field joints of a pipeline has a flame spray system having two flame spray units configured for heating and/or coating with a thermoplastic polymer an annular junction portion and two annular end portions of an existing coating delimiting the annular junction portion; a control system having two temperature sensors configured for acquiring temperature values along the surface collectively defined by the annular junction portion and the annular end portions, and a control unit configured for actuating the flame spray unit in a polymer flame spraying mode or in a flame heating mode as a function of the detected temperature values and at least one threshold value.