The present invention relates to a sprinkler system, and more specifically, to a sprinkler system which can be assembled without welding. To this end, the sprinkler system according to the present invention comprises: a main pipe through which fluid is supplied from an externa source; a first branch pipe for branching the fluid supplied through the main pipe; a second branch pipe for branching the fluid supplied through the first branch pipe so that said fluid is supplied to a sprinkler; and a detachable first coupler for interconnecting the main pipe, the first branch pipe, and the second branch pipe.

A pipe system includes a first pipe section and a second pipe section arranged, and together defining a total length, along a longitudinal axis. The first and second pipe sections are movable with respect to each other so as to shorten or lengthen the total length. A fixation member clamps a portion of the second pipe section to a portion of the first pipe section. The fixation member includes an insulator which is electrically insulating and passes no electrical current between the first and second pipe sections.

A pipe system includes a first pipe section and a second pipe section arranged, and together defining a total length, along a longitudinal axis. The first and second pipe sections are movable with respect to each other so as to shorten or lengthen the total length. A fixation member clamps a portion of the second pipe section to a portion of the first pipe section. The fixation member includes an insulator which is electrically insulating and passes no electrical current between the first and second pipe sections.

A restraint device assembly that couples adjoining pipes together is provided. The restraint device assembly includes a ring portion having an arcuate inner periphery surface that encircles an outer wall surface of a pipe. The ring includes a first tie rod opening located adjacent a first location and a second tie rod opening located adjacent a second location. The first and second tie rod openings are spaced apart from each other by a first distance. The second ring portion includes a third tie rod opening located adjacent the first location, a fourth tie rod opening located adjacent the second location. The fourth tie rod opening is spaced apart from the third tie rod opening a second distance.

A restraint device assembly that couples adjoining pipes together is provided. The restraint device assembly includes a ring portion having an arcuate inner periphery surface that encircles an outer wall surface of a pipe. The ring includes a first tie rod opening located adjacent a first location and a second tie rod opening located adjacent a second location. The first and second tie rod openings are spaced apart from each other by a first distance. The second ring portion includes a third tie rod opening located adjacent the first location, a fourth tie rod opening located adjacent the second location. The fourth tie rod opening is spaced apart from the third tie rod opening a second distance.

An embodiment of the invention may include a sealing apparatus. The sealing apparatus may include a first component having a body, where the body has an outer surface and a first arm protruding from the outer surface. The first arm includes an inner surface facing the outer surface of the body. The sealing apparatus may include a second component engaged by the first arm of the first component. The second component may have a first portion arranged inside a space between the inner surface of the first arm and the outer surface of the body and a second portion arranged outside of the space and adjacent to an outer surface of the first arm.

An embodiment of the invention may include a sealing apparatus. The sealing apparatus may include a first component having a body, where the body has an outer surface and a first arm protruding from the outer surface. The first arm includes an inner surface facing the outer surface of the body. The sealing apparatus may include a second component engaged by the first arm of the first component. The second component may have a first portion arranged inside a space between the inner surface of the first arm and the outer surface of the body and a second portion arranged outside of the space and adjacent to an outer surface of the first arm.

A system including a rod shaped and configured to be formed into a U-bolt, the rod including a body having a pair of opposed threaded ends. The system further includes a blackening coating on an outer surface of the body, and an anticorrosive coating on the blackening coating.

A system including a rod shaped and configured to be formed into a U-bolt, the rod including a body having a pair of opposed threaded ends. The system further includes a blackening coating on an outer surface of the body, and an anticorrosive coating on the blackening coating.

Tension-controlled U-bolts are disclosed having a curved rod with first and second threaded arms extending therefrom. A shearable spline is provided at the end of at least one of the threaded arms. An annular recessed channel is provided between the shearable spline and the threaded arm that provides a shear zone when a predetermined amount of torque is applied to the shearable spline.