A length of a main pipe is provided. The main pipe has an internal surface and an external surface. A plurality of channels, tubes or conduits is attached to the external surface of the main pipe and spaced about a circumference thereof. A spray foam insulation is applied to the external surface of the main pipe. Prior to curing the spray foam insulation, a compressive force is applied against an exposed outer surface of the spray foam insulation to prevent a bulge from forming over the channels, tubes or conduits so that the outer surface of the insulation has a uniform radius.

The present inventive concept includes a duct system and method for using same to map and locate ducts. A preferred embodiment of the duct system includes a duct, a plurality of electronic information modules and an oversheath at least partially covering the plurality of information modules and fixing the information modules to the duct. The plurality of information modules are configured to emit a positional signal to enable location of the information modules and associated duct(s) and/or mapping of the duct system.

The present inventive concept includes a duct system and method for using same to map and locate ducts. A preferred embodiment of the duct system includes a duct, a plurality of electronic information modules and an oversheath at least partially covering the plurality of information modules and fixing the information modules to the duct. The plurality of information modules are configured to emit a positional signal to enable location of the information modules and associated duct(s) and/or mapping of the duct system.

Disclosed in the present invention is a water circulation pipeline, comprising: an interface pipeline, the interface pipeline comprising a first pipeline and a second pipeline, one of the first pipeline and the second pipeline being provided with water inlets, and the other being provided with a water outlet, the water inlets and the water outlet being used for being connected to a water pool body, the second pipeline being nested in the first pipeline; and a pipeline body having a third pipeline, a first port of the third pipeline being in communication with the first pipeline, and a second port of the third pipeline being in communication with the second pipeline. The present invention can reduce the volumes of the water circulation pipeline and a control box. Also disclosed in the present invention are a control box and a massage water pool.

A coaxial tube arrangement for a heat exchanger may include a coaxial tube and a closing cover. The coaxial tube may include an inner core channel and an outer annular channel. The closing cover may close the coaxial tube at a longitudinal end side. The closing cover may have a base region and a circumferential edge. The base region may be aligned transversely to a flow direction through the coaxial tube. The circumferential edge may be aligned with the flow direction and may face the coaxial tube. The circumferential edge may have a thickness, which is defined transversely to the flow direction, that is equal to or greater than a height of the annular channel, which is defined transversely to the flow direction. The circumferential edge may cover the annular channel transversely to the flow direction and may separate the annular channel from the core channel in a fluid-tight manner.

A coaxial tube arrangement for a heat exchanger may include a coaxial tube and a closing cover. The coaxial tube may include an inner core channel and an outer annular channel. The closing cover may close the coaxial tube at a longitudinal end side. The closing cover may have a base region and a circumferential edge. The base region may be aligned transversely to a flow direction through the coaxial tube. The circumferential edge may be aligned with the flow direction and may face the coaxial tube. The circumferential edge may have a thickness, which is defined transversely to the flow direction, that is equal to or greater than a height of the annular channel, which is defined transversely to the flow direction. The circumferential edge may cover the annular channel transversely to the flow direction and may separate the annular channel from the core channel in a fluid-tight manner.

Cryogenic turbopump feed line, comprising a main channel able to transport a cryogenic fluid, a plurality of secondary channels parallel to and disposed around the main channel in which the plurality of secondary channels are disposed on the periphery of an external perimeter of the main channel.

Cryogenic turbopump feed line, comprising a main channel able to transport a cryogenic fluid, a plurality of secondary channels parallel to and disposed around the main channel in which the plurality of secondary channels are disposed on the periphery of an external perimeter of the main channel.

A tube comprising a first channel and a second channel wherein each of said first and second channels extends along the longitudinal axis of said tube, and wherein said tube is constituted by a first heat-sealable polymeric film A and a second heat-sealable polymeric film B. Said polymeric films A and B each have a first surface (A1, B1) and a second heat-sealable surface (A2, B2) respectively. Polymeric films A and B are disposed such that said heat-sealable surfaces A2 and B2 are in contact with and adhered to each other by heat-seal bonds which do not extend across the full surface area of said heat-sealable surfaces A2 and B2. Also described are methods of making the tube, a kit comprising a plurality of polymeric films for forming the tube, and methods for using the tube in the delivery of injectable chemicals.

A tube unit includes multiple tubes and bundling portions that bundle end portions of respective tubes at opposite ends of the tubes. At least one of the end portions of respective tubes has a tube wall portion that tubularly extends in an extension direction of the tubes and also has a protrusion protruding radially outward from the tube wall portion.