Modular connectors for rigid tubing are provided. An assembly according to embodiments of the present disclosure may include a rigid tube connected to a coupling assembly, the coupling assembly including a main body having a first tubular section and a second tubular section. The assembly may further include a connector head coupled to the coupling assembly, the connector head including a first section coupled to a second section, wherein the first and second sections define an internal cavity for housing an electrical connector, and wherein the first tubular section extends within the internal cavity.

Modular connectors for rigid tubing are provided. An assembly according to embodiments of the present disclosure may include a rigid tube connected to a coupling assembly, the coupling assembly including a main body having a first tubular section and a second tubular section. The assembly may further include a connector head coupled to the coupling assembly, the connector head including a first section coupled to a second section, wherein the first and second sections define an internal cavity for housing an electrical connector, and wherein the first tubular section extends within the internal cavity.

A magnetic crawler configured to navigate on and inspect a ferromagnetic cylindrical surface is provided. The crawler includes a chassis, a controller configured to control the crawler, a probe configured to inspect the cylindrical surface under the control of the controller, and only three articulated magnetic wheels configured to tangentially contact and magnetically adhere to the cylindrical surface. The wheels include two drive wheels respectively coupled to the chassis by two articulation joints and configured to drive the crawler in a desired direction on the cylindrical surface by actively rotating the two drive wheels independently about respective drive axes of rotation by respective drive motors under the control of the controller; and a rear wheel coupled to the chassis by a rear articulation joint and configured to passively rotate about a rear drive axis of rotation in response to the active rotations of the two drive wheels.

A magnetic crawler configured to navigate on and inspect a ferromagnetic cylindrical surface is provided. The crawler includes a chassis, a controller configured to control the crawler, a probe configured to inspect the cylindrical surface under the control of the controller, and only three articulated magnetic wheels configured to tangentially contact and magnetically adhere to the cylindrical surface. The wheels include two drive wheels respectively coupled to the chassis by two articulation joints and configured to drive the crawler in a desired direction on the cylindrical surface by actively rotating the two drive wheels independently about respective drive axes of rotation by respective drive motors under the control of the controller; and a rear wheel coupled to the chassis by a rear articulation joint and configured to passively rotate about a rear drive axis of rotation in response to the active rotations of the two drive wheels.

A stainless steel pipe of a predetermined composition is provided that has an axial tensile yield strength of 689 MPa or more, an axial compressive yield strength/axial tensile yield strength ratio of 0.85 to 1.15, and a microstructure that is 20 to 80% ferrite phase by volume with the remainder containing an austenite phase, the stainless steel pipe having pipe end portions at least one of which has a fastening portion for an external thread or an internal thread, and having a curvature radius of 0.2 mm or more for a corner R formed by a bottom surface of a thread root and a pressure-side flank surface of the thread, measured in an axial plane section of the fastening portion.

A stainless steel pipe of a predetermined composition is provided that has an axial tensile yield strength of 689 MPa or more, an axial compressive yield strength/axial tensile yield strength ratio of 0.85 to 1.15, and a microstructure that is 20 to 80% ferrite phase by volume with the remainder containing an austenite phase, the stainless steel pipe having pipe end portions at least one of which has a fastening portion for an external thread or an internal thread, and having a curvature radius of 0.2 mm or more for a corner R formed by a bottom surface of a thread root and a pressure-side flank surface of the thread, measured in an axial plane section of the fastening portion.

Provided is a clad welded pipe or tube that has improved pipe or tube mechanical properties by reducing the width of a weld without its function as a clad pipe or tube being impaired. A clad welded pipe or tube comprises: a first layer made of base metal; and a second layer placed on one surface of the first layer, and made of first cladding metal that is a material different from the base metal, wherein a pipe or tube circumferential length L1 of weld metal at a pipe or tube inner surface and a pipe or tube circumferential length L2 of the weld metal at a pipe or tube outer surface in a weld are each 0.0010 mm or more and 1.0 mm or less, and the base metal is not exposed at a first cladding metal-side surface of the clad welded pipe or tube in the weld.

The present invention relates to an air conditioner. The air conditioner according to the present embodiment has a refrigeration capacity of 7 kW to 11 kW, inclusive, and uses a refrigerant R32 as a refrigerant, and since a refrigerant pipe therein is made of a ductile stainless steel material having 1% or less of a delta-ferrite matrix structure with respect to the grain size area thereof, and includes a suction pipe guiding the suction of the refrigerant into a compressor and having an outer diameter of 15.88 mm, the refrigerant pipe can maintain strength and hardness as good as or better than those of a copper pipe, while also maintaining good processability.

The present invention relates to an air conditioner. The air conditioner according to the present embodiment has a refrigeration capacity of 7 kW to 11 kW, inclusive, and uses a refrigerant R32 as a refrigerant, and since a refrigerant pipe therein is made of a ductile stainless steel material having 1% or less of a delta-ferrite matrix structure with respect to the grain size area thereof, and includes a suction pipe guiding the suction of the refrigerant into a compressor and having an outer diameter of 15.88 mm, the refrigerant pipe can maintain strength and hardness as good as or better than those of a copper pipe, while also maintaining good processability.

The present application provides an anti-corrosion super-slippery aluminum capillary tube and method and device for preparing the same. The preparation starts with the etching and drying of the inner walls of an aluminum capillary tube, which leads to the formation of an alumina capillary structure surface with micro-nano scale roughness. Next, the alumina capillary structure surface is modified to form a low surface energy modifying layer. Finally, the modified alumina capillary structure surface is wetted by a prewetting solution, so that a continuous film of the prewetting solution is formed on the inner wall of the aluminum capillary tube to function as a lubricating layer. The lubrication layer, on one hand, reduces the flow resistance for convey of liquid media, on the other hand, prevents the conveyed liquids from directly contacting the aluminum capillary tube body, thereby avoiding the corrosion of the aluminum capillary tube by corrosive liquids.