The present invention provides a piping unit that facilitates downsizing of a cooler by decreasing the temperature of fluid to be introduced into the cooler without reducing the cooling effect of a cooler. A piping unit is for introduction of heated fluid into a cooler, the piping unit being formed from synthetic resin and including a heat exchange structure on an inner peripheral surface.

Disclosed are a stainless steel having a new composition, which has properties of low strength as compared with a conventional stainless steel, that includes, percent by weight, C: 0.03% or less, Si: exceeding 0 to 1.7% or less, Mn: 1.5 to 3.5%, Cr: 15.0 to 18.0%, Ni: 7.0 to 9.0%, Cu: 1.0 to 4.0%, Mo: 0.03% or less, P: 0.04% or less, S: 0.04% or less, N: 0.03% or less, residue: Fe, and incidental impurities, and has an austenite matrix structure and an average diameter of 30 to 60 m, and a system such as an air conditioner including the stainless steel thereof.

A modular pipe and a method of installing the pipe uses a first pipe section positioned in end to end relation with a second pipe section, the first and second pipe sections being precast from a cement-based material, wherein each pipe section has an outer surface, a flow passage, a first end, and a second end. Each end has a connection profile, an axis, and an end face that is perpendicular to the axis. A collar surrounds and secures the connection between adjacent ends. The collar is constructed from a plurality of collar elements. Each collar element overlaps the pipe connection and engages the connection profile along a portion of the perimeter of each of the first end of the second pipe section and the second end of the first pipe section.

The presently disclosed subject matter relates to an improved system for hydrocarbon cracking. In a specific non-limiting embodiment, a hydrocarbon cracker system can include one or more furnace tubes having a plurality of indentations disposed thereon, where the indentations do not project into the interior of the furnace tube.

This invention concerns a tubular element for a gas pressure vessel of an airbag module, in particular of a vehicle, wherein the tubular element (1) consists of high-strength steel, has a first and a second end (17, 18) and from the first end (17) to the second end (18) the tubular element (1) has an undeformed section (11), a transition section (12) and a tapering section (13) and on the tapering section (13) at least one radially outwardly extending collar (14) is formed, characterized in that the collar (14) is separated from the transition section (12) by a first length section (130) having an outer diameter (A1) smaller than the outer diameter (A2) of the collar (14) and the wall thickness of the collar (14) is greater than the wall thickness of the first length section (130). Furthermore, the invention concerns a gas pressure vessel and a process for manufacturing a tubular element according to the invention (1).

Provided herein are components for a fluid network, specifically a U bend structure connected to at least two pipes which is modified for one or more objective functions of interest such as pressure drop, erosion rate, fouling, coke deposition and operating costs. The U bend structure is so designed to have a specific ARQ between 1.0 to 1.02 for 5% of the flow passage from the inlet and from the outlet, and an ARQ from 1.02 to 1.15 over the remaining 90% of the flow passage through an Rb/D ratio being greater than 1 and less than 4.

Flexible tubing or hose is formed from continuously extruded thermoplastic material helically circumferentially wound at a wrapping station around an array of bearing-supported rods that are concurrently but individually turned and are canted relative to an imaginary central axis. The tubing or hose is formed to have a continuous reinforcing rib helically wound therearound and continuously integrally connected thereto. The positions of the rods are progressively altered during formation of at least a contiguous portion of the tubing or hose, causing the resulting contiguous portion to exhibit a progressive continuous change in diameter. The resulting tubing or hose may be transversely severed at intervals along its length, and may be flattened to form cuffs near where severed. A selected portion of the tubing or hose, which may or may not at least partially coincide with the contiguous portion, may be axially compressed and annealed to relieve stress therein.

A metal pipe having a thickened end portion, the metal pipe includes: when viewed in a longitudinal direction of the metal pipe, a thin portion which has a thickness t.sub.0; a first thickened portion which is provided on one end and has a thickness T which is larger than the thickness t.sub.0; and a first taper portion which is provided between the thin portion and the first thickened portion and has the thickness which gradually increases from t.sub.0 to T; when a hardness of an inner surface of the first thickened portion is measured in a circumferential direction and the hardness is plotted with respect to a position in the circumferential direction, in which a waveform representing a high hardness portion having a hardness which is 95% or more of a maximum hardness in the circumferential direction and a waveform representing a low hardness portion having a hardness which is less than 95% of the maximum hardness alternately appear, and a plurality of combinations of the waveform representing the high hardness portion and the waveform representing the low hardness portion appear.

There is provided a technique that includes: a first connector including a first opening including two longitudinally extending parallel sides and configured to provide a detachable connection to an opening of a first counterpart; and a second connector including a substantially circular second opening and configured to be connectable to an opening of a second counterpart; and a pipe including an internal space formed in a shape of a polyhedron and configured to allow fluid communication between the first opening and the second opening.

A tube arrangement for the transport of temperature control medium, comprising a base body (2) made of polymeric material and produced by means of blow molding, wherein at least one functional element (3) is arranged in the base body (2), which element is in operative connection with the temperature control medium.