Abstract: A concrete structure with a corrugated bottom surface has a pipe passing through a passage in the structure. A fire stop assembly has a first portion with a split plate, split cage, split intumescent ring, split inner smoke ring and split outer smoke ring each fastened together to rotate together about a hinge on the split cage. The fire stop assembly has a second portion of the split plate, split cage, split intumescent ring, split inner smoke ring and split outer smoke ring fastened together to rotate together about a hinge. The first and second portions have free ends that spread apart to fit around the tube in an open position, and close around the tube in a closed position.

Abstract: A concrete floor has a pipe passing through a hole in the floor. A drop-in fire stop assembly has a clam-shell configuration having first and second portions of a fire ring, split cage, split retainer ring, split intumescent ring, split inner smoke ring and split outer smoke ring each fastened together to rotate about a hinge on the split cage to open and close. The first and second portions have free ends that spread apart to fit around the tube in an open position, and close around the tube in a closed position. A latch on the free ends of the cage hold the two portions together in the closed position.

Abstract: A concrete structure with a corrugated bottom surface has a pipe passing through a passage in the structure. A fire stop assembly has a first portion with a split plate, split cage, split intumescent ring, split inner smoke ring and split outer smoke ring each fastened together to rotate together about a hinge on the split cage. The fire stop assembly has a second portion of the split plate, split cage, split intumescent ring, split inner smoke ring and split outer smoke ring fastened together to rotate together about a hinge. The first and second portions have free ends that spread apart to fit around the tube in an open position, and close around the tube in a closed position.

Abstract: A concrete floor has a pipe passing through a hole in the floor. A drop-in fire stop assembly has a clam-shell configuration having first and second portions of a fire ring, split cage, split retainer ring, split intumescent ring, split inner smoke ring and split outer smoke ring each fastened together to rotate about a hinge on the split cage to open and close. The first and second portions have free ends that spread apart to fit around the tube in an open position, and close around the tube in a closed position. A latch on the free ends of the cage hold the two portions together in the closed position.

Abstract: A concrete structure with a corrugated bottom surface has a pipe passing through a passage in the structure. A fire stop assembly has a first portion with a split plate, split cage, split intumescent ring, split inner smoke ring and split outer smoke ring each fastened together to rotate together about a hinge on the split cage. The fire stop assembly has a second portion of the split plate, split cage, split intumescent ring, split inner smoke ring and split outer smoke ring fastened together to rotate together about a hinge. The first and second portions have free ends that spread apart to fit around the tube in an open position, and close around the tube in a closed position.

Abstract: A concrete floor has a pipe passing through a hole in the floor. A drop-in fire stop assembly has a clam-shell configuration having first and second portions of a fire ring, split cage, split retainer ring, split intumescent ring, split inner smoke ring and split outer smoke ring each fastened together to rotate about a hinge on the split cage to open and close. The first and second portions have free ends that spread apart to fit around the tube in an open position, and close around the tube in a closed position. A latch on the free ends of the cage hold the two portions together in the closed position.

Abstract: A water hammer arrester and a process for making a water hammer arrester. The arrester includes a includes a cylindrical tube that contains a sliding piston separating the interior into a gas portion and a liquid portion. The gas portion is enclosed by a cap. The liquid portion has a pipe fitting for connection to a liquid-carrying pipe. The process includes assembling the piston, cylinder, fitting, and cap together outside of a pressured chamber used to charge the gas portion. A pressure chamber receives the cap and open end of the cylinder, and tabs around the cap allow fluid flow into the gas portion of the cylinder. Increasing gas pressure in the pressure chamber simultaneously increases gas pressure inside the gas portion. At this raised pressure, an ultrasonic welding horn engages the cap and/or cylinder to weld the two together trapping the gas therein under pressure.

Abstract: A method is provided for the formation of a molded article comprising the steps of: providing at least one liquid plastisol composition, providing an injection molding apparatus including an injection barrel, feeding the at least one liquid plastisol composition to the injection barrel, heating the at least one plastisol composition within the injection barrel to the fusion temperature of the plastisol, and injecting the at least one plastisol composition to the mold.