Abstract: A connection structure of a corrugated pipe is provided that may include a corrugated pipe, a clamping nut located outside of the corrugated pipe, a confinement ring mounted on a valley of the corrugated pipe and disposed within the clamping nut, a connection body having an insertion portion inserted into the clamping nut and having male threads threaded to the clamping nut, and a packing member located between an end of the corrugated pipe and the insertion portion to compress and deform the end of the corrugated pipe when the clamping nut is clamped and to provide a sealing between the end of the corrugated pipe and the insertion portion. As the packing member provides the sealing between the insertion portion of the connection body and the end of the corrugated pipe, a gap may minimally occur and reliability is increased.

Abstract: A spiral-type flexible pipe connector is provided that includes a socket, into which one end of a spiral-type flexible pipe is inserted, a nut coupled to the socket to fix the spiral-type flexible pipe to the socket, and a packing and a support ring located between the one end of the spiral-type flexible pipe and the socket. The packing includes a sealing portion, into which a tip of the one end of the spiral-type flexible pipe is inserted, such that the sealing portion surrounds the tip of the one end of the spiral-type flexible pipe, thereby sealing a connection part of the spiral-type flexible pipe.

Abstract: The flexible pipe connected with the flexible pipe connecting structure according to an embodiment of the present invention, wherein the connecting structure includes a body part, and a connecting part configured to have a smaller thickness than a thickness of the body part, wherein the first end portion is inserted into and welded to the connecting part, wherein the ledge is a step part provided between the body part and the connecting part.

Abstract: According to the present invention, a connection structure of a corrugated pipe comprises a corrugated pipe, a clamping nut located outside the corrugated pipe, a confinement ring mounted on a valley of the corrugated pipe and held in position of the clamping nut, a connection body having an insertion portion inserted into the clamping nut and having male threads threaded to the clamping nut, and a packing member located between an end of the corrugated pipe and the insertion portion to compress and deform the end of the corrugated pipe when the clamping nut is clamped and to provide sealing between the end of the corrugated pipe and the insertion portion. Since the packing member provides sealing between the insertion portion of the connection body and the end of the corrugated pipe, a gap may minimally occur and reliability is increased.

Abstract: The flexible pipe connected with the flexible pipe connecting structure according to an embodiment of the present invention, wherein the connecting structure includes a body part, and a connecting part configured to have a smaller thickness than a thickness of the body part, wherein the first end portion is inserted into and welded to the connecting part, wherein the ledge is a step part provided between the body part and the connecting part.

Abstract: A welding apparatus of a stainless steel pipe comprises a welding torch jetting argon gas for shielding oxygen into a gap of the steel pipe rolled in a circular shape, while fusing any one of base metal and a welding material; and a gas supply pipe installed inside the steel pipe, the gas supply pipe having a jetting nozzle which jets argon gas at a rate of 4 to 20 l/min toward the inner surface of a welding bead portion, where welding has been already completed and which is positioned backwardly at a predetermined distance from a welding bead portion where welding is being performed by the welding torch.

Abstract: Disclosed is a spiral-type flexible pipe connector. The spiral-type flexible pipe connector includes a socket, into which one end of a spiral-type flexible pipe is inserted, a nut coupled to the socket to fix the spiral-type flexible pipe to the socket, and a packing and a support ring located between the end of the spiral-type flexible pipe and the socket, and the packing includes a sealing part, into which the tip of the end of the spiral-type flexible pipe is inserted such that the sealing part surrounds the tip of the end of the spiral-type flexible pipe, thereby improving watertightness of a connection part of the spiral-type flexible pipe and efficiency in a coupling process of a product.

Abstract: A welding apparatus of a stainless steel pipe comprises a welding torch jetting argon gas for shielding oxygen into a gap of the steel pipe rolled in a circular shape, while fusing any one of base metal and a welding material; and a gas supply pipe installed inside the steel pipe, the gas supply pipe having a jetting nozzle which jets argon gas at a rate of 4 to 20 l/min toward the inner surface of a welding bead portion, where welding has been already completed and which is positioned backwardly at a predetermined distance from a welding bead portion where welding is being performed by the welding torch.

Abstract: A structure and a method for coupling a protective net to a flexible tube, comprising shaping the flexible tube, wrapping the flexible tube with the meshed protective net made of stainless steel, and welding both ends of the flexible tube to both ends of the protective net. A solution heating process for the flexible tube and welding process for the flexible tube and the protective net are simultaneously carried out under the same condition in the same furnace. As a result, the protective net and the flexible tube are uniform in terms of physical properties. Furthermore, intergranular corrosion of stainless steel by inevitable stress generated upon welding a flexible tube and a protective net using any one of conventional methods, and crevice corrosion between a welding ring and a flexible tube, are prevented.

Abstract: A mounting device for mounting a reducer support beam of a sprinkler system to a ceiling support rail of a drop ceiling in a building. The mounting device comprises an adjustable clamp portion and a mount portion. The clamp portion has opposing ceiling support rail engagement portions separated by a clamping space sized and shaped for receiving a portion of the ceiling support rail of the drop ceiling. The clamp portion is adapted to adjustably move the rail engagement portions relative to one another between a loosened position and a clamped position to vary the clamping space separating the rail engagement portions. The clamping space is sized to receive the ceiling support rail when the rail engagement portions are in the loosened position. The rail engagement portions are adapted to securely engage the ceiling support rail when the rail engagement portions are in the clamped position.

Abstract: A structure and a method for coupling a protective net to a flexible tube, comprising shaping the flexible tube, wrapping the flexible tube with the meshed protective net made of stainless steel, and welding both ends of the flexible tube to both ends of the protective net. A solution heating process for the flexible tube and welding process for the flexible tube and the protective net are simultaneously carried out under the same condition in the same furnace. As a result, the protective net and the flexible tube are uniform in terms of physical properties. Furthermore, intergranular corrosion of stainless steel by inevitable stress generated upon welding a flexible tube and a protective net using any one of conventional methods, and crevice corrosion between a welding ring and a flexible tube, are prevented.

Abstract: A mounting device for mounting a reducer support beam of a sprinkler system to a ceiling support rail of a drop ceiling in a building. The mounting device comprises an adjustable clamp portion and a mount portion. The clamp portion has opposing ceiling support rail engagement portions separated by a clamping space sized and shaped for receiving a portion of the ceiling support rail of the drop ceiling. The clamp portion is adapted to adjustably move the rail engagement portions relative to one another between a loosened position and a clamped position to vary the clamping space separating the rail engagement portions. The clamping space is sized to receive the ceiling support rail when the rail engagement portions are in the loosened position. The rail engagement portions are adapted to securely engage the ceiling support rail when the rail engagement portions are in the clamped position.

Abstract: Disclosed herein is a flexible spiral tube for fire extinguishing systems. This invention provides a flexible spiral tube, which is not only highly flexible but also resistant to elongation, so that the tube is not easily ruptured by bending to allow the fire extinguishing sprinkler system to be easily installed in the interior of a ceiling, and is not excessively elongated by the high pressure of a fire extinguishing fluid to prevent the sprinkler head of the sprinkler system from being undesirably removed from the ceiling. The flexible spiral tube is preferably dimensioned to have an outer diameter ranging from 26.0 to 27.5 mm, a thickness ranging from 0.3 to 0.4 mm, a pitch ranging from 5.9 to 6.5 mm, the width of its groove ranging from 2.4 to 2.5 mm, and the height of its ridge ranging from 2.65 to 2.75 mm.

Abstract: A device for mounting a sprinkler to a ceiling support rail in a building is disclosed. This device consists of two vertical sidewalls integrated into a U-shaped single structure by a top wall. The two sidewalls are bent inwardly at their lower ends to form clip flanges for gripping the head of the ceiling support rail positioned between the two sidewalls. A first bolt hole is formed at the lower portion of each sidewall. A first locking bolt is threaded into the bolt holes of the two sidewalls so as to tighten the lower portions of the two sidewalls and allow the two sidewalls to firmly grip the ceiling support rail. Each of the two sidewalls also has a notch at its upper portion and seats the reducer support beam in the notch. The top wall has a second bolt hole. A second locking bolt is threaded into the second bolt hole so as to hold the reducer support beam seated in the notches of the two sidewalls.