The present invention relates to bolt and nut loosening prevention assemblies for preventing a bolt and a nut adapted to fix a first member and a second member to each other from loosening, including: loosening prevention members fitted to the bolt and the nut coupled to the first member and the second member, respectively; caps detachably coupled to the loosening prevention members, respectively, to prevent the loosening prevention members from rotating; and dual washers fixedly coupled to the insides of the loosening prevention members, respectively, to prevent the bolt and the nut from loosening.

A fracturing manifold system includes a first manifold assembly in a side-by-side arrangement with a second manifold assembly. The first manifold assembly includes a plurality of first junctions, each having multiple inlet ports facing a first side of the fracturing manifold system. The second manifold assembly includes a plurality of second junction, each having multiple inlet ports facing a second side of the fracturing manifold assembly. Inlet ports on a single junction may be angled relative to each. The inlet ports may also be angled relative to a manifold flow path.

An assembly component for a vacuum chamber, comprising a body and a flange, has a surface configured to press a seal against another mechanical part. The flange is made of an aluminum alloy and the surface is covered with a metal deposit mostly comprising nickel.

An assembly component for a vacuum chamber, comprising a body and a flange, has a surface configured to press a seal against another mechanical part. The flange is made of an aluminum alloy and the surface is covered with a metal deposit mostly comprising nickel.

A tube assembly comprising first and second tubes connected by means of fittings welded to ends of the respective tubes. The fittings are placed adjacent to each other and then coupled using a clamp, thereby placing the first and second tubes in fluid communication. At least one of the fittings is an orifice fitting configured to restrict the flow of fluid. Each fitting is configured with at least one projection that assists a clamp to hold the fittings together. Preferably the projections are annular. In some embodiments, the orifice fitting comprises a cylindrical wall and a plate extending radially inward from the cylindrical wall and having a circular orifice. The orifice has a radius less than the inner radius of the tube assembly, so that flow will be restricted by the orifice.

A dissimilar metal connection arrangement comprising a dissimilar metal connection between a first member made of a first metal and having a first end, and a second member made of a second metal different from said first metal with regard to its metallurgical behavior, and having a second end, wherein the first end of the first member is fixedly connected to the second end of the second member. An increased lifetime of the connection is achieved by arranging a heating means at said dissimilar metal connection for controlled heating of said dissimilar metal connection.

A seawater suction system (10) is provided comprising first and second conduits (12, 14) connected to one another so as to form an internal fluid passage allowing fluid communication between the two conduits (12, 14), wherein the first conduit (12) is formed from at least two layers of a first material and the second conduit (14) is formed from a single layer of a second material which is different from the first material.

A seawater suction system (10) is provided comprising first and second conduits (12, 14) connected to one another so as to form an internal fluid passage allowing fluid communication between the two conduits (12, 14), wherein the first conduit (12) is formed from at least two layers of a first material and the second conduit (14) is formed from a single layer of a second material which is different from the first material.

A protection structure of a sampling tube of a tank truck is provided. A positioning and protecting base is provided around an outer circumference of the sampling tube. The sampling tube includes a sampling output port for connection with a sampling output hose. The positioning and protecting base includes a through hole. The sampling output port extends through the through hole to partly project outside of the positioning and protecting base. With such an arrangement, the stiffness and strength of the entire sampling output port are enhanced for resisting impact and hit, and readiness of connection between the sampling output port and a sampling output hose is not negatively affected to thereby improve usage performance of the sampling tube.

A flange joint assembly includes a first structure including a first flange and a second structure including a second flange coupled to the first flange to form a joint therebetween. The second flange includes a radially outer surface. The flange joint assembly also includes a compression ring coupled to at least the radially outer surface and configured to apply a compressive force to the radially outer surface to reduce an amount of tension stress within said second flange.