Embodiments of the invention are directed to a device and a method for unloading particulate material from a reactor tube of a catalytic reactor comprising an array of substantially vertically aligned reactor tubes. The device comprises an air lance (11, 111-113) for loosening the particulate material inside the reactor tube using pressurized air, an air lance unit (10) for feeding the air lance in and out of the reactor tube, and a flexible guide tube (12, 121-123) on one end connectable to the air lance unit and on the other end connectable to a cleaned reactor tube (7, 71-73) for guiding the air lance from the reactor tube to the cleaned reactor tube for storing a part of the air lance that has not been fed into the reactor tube within the first cleaned reactor tube.

A build material management system for a 3D printing system is described in which a non-fused purged build material port is to output purged non-fused build material from a build material transportation system. An emptying of substantially all non-fused build material from at least a portion of the build material transportation system to the non-fused purged build material port in response to a received purge signal is controlled by processing circuitry of the build material management system.

A build material management system for a 3D printing system is described in which a non-fused purged build material port is to output purged non-fused build material from a build material transportation system. An emptying of substantially all non-fused build material from at least a portion of the build material transportation system to the non-fused purged build material port in response to a received purge signal is controlled by processing circuitry of the build material management system.

A method includes the following steps. A wafer is disposed on a wafer-mounting surface of a wafer holder that is disposed in a chamber. The wafer-mounting surface is in parallel with a gravity direction. A gas is flown from a gas source to vacuum sealing device. An inductive coil wrapping around a vacuum sealing device excites the gas into plasma. The plasma is injected to the wafer.

An apparatus for treating waste of a nuclear reactor pressure vessel includes: a suction unit inserted into the nuclear reactor pressure vessel through a plurality of through-pipes passing through a lower portion of the nuclear reactor pressure vessel to suck waste inside the nuclear reactor pressure vessel; a waste treatment part connected to the suction unit to treat the waste; and a lower collection part connected to the waste treatment part to be positioned under the nuclear reactor pressure vessel with the suction unit therebetween.

A declogging assembly (20) is configured for use with a suction conduit (10). The suction conduit has a head (14) at a first end (15) and a vacuum tube connection (16) at a second end (17). The assembly includes a body (30). The body defines a first aperture (32), a second aperture (34), and a third aperture (36). The assembly also includes a plug (40) disposed within the body (30). The plug has a surface (42) configured to contact the head (14) of the suction conduit (10) so as to move the plug from a first position, in which the first aperture (32) is in fluid communication with the second aperture (34), to a second position, in which the first aperture (32) is in fluid communication with the third aperture (36). The assembly (20) also includes a biasing member (50) configured to bias the plug into the first position.

A plumbing clog removal apparatus that includes a vacuum chamber having an inlet, an outlet, and a compressor port. The clog removal apparatus also includes an inlet seal disposed at the vacuum chamber inlet. The vacuum chamber inlet seal is movably coupled to the vacuum chamber inlet and is movable between an open position and a closed position. The plumbing clog removal apparatus also includes, an outlet seal disposed at the vacuum chamber outlet. The outlet seal is movably coupled to the vacuum chamber outlet and is movable between an open position and a closed position. The vacuum chamber also includes an air compressor fluidically connected to the vacuum chamber compressor port. The compressor is configured to remove air from the compressor chamber and form a low pressure condition inside the vacuum chamber.

A plumbing clog removal apparatus that includes a vacuum chamber having an inlet, an outlet, and a compressor port. The clog removal apparatus also includes an inlet seal disposed at the vacuum chamber inlet. The vacuum chamber inlet seal is movably coupled to the vacuum chamber inlet and is movable between an open position and a closed position. The plumbing clog removal apparatus also includes, an outlet seal disposed at the vacuum chamber outlet. The outlet seal is movably coupled to the vacuum chamber outlet and is movable between an open position and a closed position. The vacuum chamber also includes an air compressor fluidically connected to the vacuum chamber compressor port. The compressor is configured to remove air from the compressor chamber and form a low pressure condition inside the vacuum chamber.

Disclosed is a method of maintaining fluid flow through a plumbing system, comprising sealing an opening of all but one of the plurality of plumbing fixtures to result in a first unsealed plumbing fixture; connecting a vacuum assembly to an opening of the plumbing system below the horizontal pipe line by connecting a first end of a vacuum conduit to a vacuum source and a second end of the vacuum conduit to the opening of the plumbing system; connecting a pump assembly to the unsealed plumbing fixture by connecting a first end of a fluid conduit to a tank and a second end of the fluid conduit to an opening of the first unsealed plumbing fixture; activating the vacuum source; and introducing a volume of fluid from the pump assembly through the fluid conduit into the opening of the unsealed plumbing fixture. Also disclosed are systems for maintaining fluid flow.

Disclosed is a method of maintaining fluid flow through a plumbing system, comprising sealing an opening of all but one of the plurality of plumbing fixtures to result in a first unsealed plumbing fixture; connecting a vacuum assembly to an opening of the plumbing system below the horizontal pipe line by connecting a first end of a vacuum conduit to a vacuum source and a second end of the vacuum conduit to the opening of the plumbing system; connecting a pump assembly to the unsealed plumbing fixture by connecting a first end of a fluid conduit to a tank and a second end of the fluid conduit to an opening of the first unsealed plumbing fixture; activating the vacuum source; and introducing a volume of fluid from the pump assembly through the fluid conduit into the opening of the unsealed plumbing fixture. Also disclosed are systems for maintaining fluid flow.