A heating device for in-service welding of oil and gas pipeline, which comprises a heating section, a heat dissipation section and a constant temperature section, wherein the heating section and the heat dissipation section are mounted on an oil and gas pipeline. The heating section heats the oil and gas pipeline to simultaneously heat the wall of the oil and gas pipeline and fluid in the oil and gas pipeline. A work station to be welded is heated by utilizing flowing of the fluid and heat conduction of the wall of the oil and gas pipeline. The heat dissipation section is mounted on the oil and gas pipeline. The heat dissipation section recovers the heat of the oil and gas pipeline by utilizing state change of a heat transfer medium in the heat dissipation section and also transfers the heat to the heating section through the constant temperature section

A multi-part line, wherein line parts are provided, at ends of said line parts, with at least one connector assembly having at least one retaining element, wherein a connector part of the connector assembly of a line part and a coupling part of the connector assembly of the adjacent line part can be or are connected by overplugging and locking the at least one retaining element. At least one insulating element is arranged in the overplugging region of the connector part of the connector assemblies that can be or are connected to each other, which insulating element is designed as an axially compressible closed ring made of a material that has low heat conduction at least in the outer region of the insulating element, which ring has an inner passage opening in order provide insulation in the overplugging regions between the connector assemblies, in which overplugging regions no heating by, for example, the engine of a vehicle or other heat sources occurs, which insulation enables economical and also effective insulation during the operation and also during the standstill of a vehicle and is protected against unintentional or inadvertent removal.

A multi-part line, wherein line parts are provided, at ends of said line parts, with at least one connector assembly having at least one retaining element, wherein a connector part of the connector assembly of a line part and a coupling part of the connector assembly of the adjacent line part can be or are connected by overplugging and locking the at least one retaining element. At least one insulating element is arranged in the overplugging region of the connector part of the connector assemblies that can be or are connected to each other, which insulating element is designed as an axially compressible closed ring made of a material that has low heat conduction at least in the outer region of the insulating element, which ring has an inner passage opening in order provide insulation in the overplugging regions between the connector assemblies, in which overplugging regions no heating by, for example, the engine of a vehicle or other heat sources occurs, which insulation enables economical and also effective insulation during the operation and also during the standstill of a vehicle and is protected against unintentional or inadvertent removal.

A reinforcing connecting assembly is applied for a plurality of water pipes each of which includes a mouth portion defining an opening. The mouth portion includes a first curved portion. The reinforcing connecting assembly comprises a plurality of linking pieces and a connecting plate. Each of the linking pieces includes a connecting wall and two opposite side walls connected with the connecting wall. The connecting wall has a first surface abutting the first curved portion and a second surface opposite to the first surface. Each of the side walls includes a reinforcing portion. The reinforcing portions of the side walls are distant from each other and extend from two sides of the connecting wall toward a direction opposite to the first surface. The connecting plate connects the connecting wall of each of the linking pieces.

A reinforcing connecting assembly is applied for a plurality of water pipes each of which includes a mouth portion defining an opening. The mouth portion includes a first curved portion. The reinforcing connecting assembly comprises a plurality of linking pieces and a connecting plate. Each of the linking pieces includes a connecting wall and two opposite side walls connected with the connecting wall. The connecting wall has a first surface abutting the first curved portion and a second surface opposite to the first surface. Each of the side walls includes a reinforcing portion. The reinforcing portions of the side walls are distant from each other and extend from two sides of the connecting wall toward a direction opposite to the first surface. The connecting plate connects the connecting wall of each of the linking pieces.

Described herein is an apparatus and method for avoiding frost and ice buildup in and on vent pipes that transport a stream of gas from the inside to the outside of a building. The apparatus and method comprise a heat-conducting path that extracts heat energy from the stream of gas exiting the vent pipe, and transfers this energy to the frost and ice condensing surfaces at or near the terminus of the vent pipe. The heat-conducting path comprises a heat pipe. In one embodiment the heat-conducting path further comprises a heat exchanger. The passive transfer of heat energy via the heat-conducting path, from the stream of gas to the condensing surfaces of the vent pipe, avoids frost and ice buildup in or around the terminus of the vent pipe.

A system for depressurizing a gas in a pipeline is described. The system com-prises an expander configured and arranged for generating mechanical power by expanding gas from a first pressure to a second pressure. The system further comprises a heat pump and a heat transfer circuit containing a heat transfer fluid circu-lating therein, for receiving heat from the heat pump and delivering heat to the gas through a heat exchanger. A controller is further provided, configured and arranged for modulating a flow rate of the heat transfer fluid circulating in the heat transfer circuit as a function of a heat rate to be transferred from the heat transfer fluid to the gas, particularly as a function of temperature differentials between the gas and the heat transfer fluid at a gas inlet side and a gas outlet side of the heat exchang-er.

A method is shown for installing a heat tube on a section of pre-insulated piping. A metal carrier pipe is covered with a first layer of foam insulation. Next, a routing device is used to cut a longitudinal slot along the length of the pipe so that the pipe exterior surface is exposed from the insulation. A heat tube is then installed within the longitudinal slot, whereby the heat tube contacts the exterior surface of the metal carrier pipe. A second layer of foam insulation is then sprayed onto the exterior of the metal carrier pipe, covering the previously formed longitudinal slot and installed heat tube. A polyolefin coating is then applied over the insulation to form a protective outer jacket for the insulated pipe.

A method is shown for installing a heat tube on a section of pre-insulated piping. A metal carrier pipe is covered with a first layer of foam insulation. Next, a routing device is used to cut a longitudinal slot along the length of the pipe so that the pipe exterior surface is exposed from the insulation. A heat tube is then installed within the longitudinal slot, whereby the heat tube contacts the exterior surface of the metal carrier pipe. A second layer of foam insulation is then sprayed onto the exterior of the metal carrier pipe, covering the previously formed longitudinal slot and installed heat tube. A polyolefin coating is then applied over the insulation to form a protective outer jacket for the insulated pipe.

A line connector for a fluid and a ready-made medial line including the line connector. The line connector includes a connecting piece with a flow-through channel in the interior thereof and extending in a longitudinal direction of the connecting piece. The connecting piece has at each of its two ends a coupling section that is designed such that a flexible media line or a tubing or an aggregate can be connected to an aggregate connector. The flow-through channel is provided with an electrical heating unit. In the region of the flow-through channel, between the connecting sections, a circumferential enclosed receiving housing is formed on the coupling piece and in which an optical sensor unit is disposed for measuring characteristics of the fluid flowing in the flow-through channel. The ready-made media line includes the line connector and a tubular media line connected on one or both ends thereof.