Disclosed herein is a system for surface treating an internal surface of a part. The system comprises a tank within which the part is locatable. The system also comprises a fluid within the tank and capable of submersing the part when the part is located within the tank. The system further comprises a nozzle submersed in the fluid and configured to generate a stream of cavitated fluid directed in a first direction. The system additionally comprises a deflection tool submersed in the fluid and comprising a deflection surface that redirects the stream of cavitated fluid from the first direction to a second direction. The first direction is away from the internal surface of the part and the second direction is toward the internal surface of the part.

A system for cutting an underwater structure, the system comprising: a cutting head, said cutting head comprising: an abrasive water jetting nozzle; a cryogenic nozzle; said abrasive water jetting nozzle and cryogenic nozzle mounted in fixed spaced relation; said cutting head arranged to position tips of the nozzles proximate to a cutting surface, and arranged to form a cutting zone defined by the nozzle tips and cutting surface; wherein a water repelling shield is located about said cutting zone and arranged to hinder water entering said cutting zone.

In an exhaust gas purification apparatus or other apparatuses that are supplied with ammonia generated from a urea aqueous solution and causes selective reduction and purification of nitride oxides, a shot peening treatment is applied to a welded portion of its exhaust pipe which is made of a ferritic stainless steel plate and through which exhaust gas containing ammonia and hydrogen passes. By shot peening the welded portion of the exhaust pipe, a tensile residual stress in the welded portion of the exhaust pipe can be replaced with a compressive residual stress, and further the diameter of metal crystal grains in the welded portion can be reduced. In this way, the durability of the exhaust pipe can be improved.

A method for cleaning the interior of a freight container of ISO type having an access opening for receiving goods, wherein the method comprises: providing a cleaning tool comprising a framework, a robot movably connected to the framework and having a nozzle for supplying a cleaning medium including dry ice, and an actuating unit arranged to move the robot relative to the framework; gripping the framework of the tool with a truck designed for gripping and carrying freight containers of ISO type; driving the truck carrying the tool to the container to be cleaned; moving the robot into an interior of the container by means of the actuating unit; and moving the nozzle by means of the robot along a programmed cleaning path while cleaning the interior of the container by means of dry ice blasting.

Blasting apparatus are disclosed relating to abrasive blasting that include a blasting pot and a blast pot discharge assembly connected to the blasting pot below the blasting pot. The blast pot discharge assembly may contain an elbow section and an eccentric reducer section and may also have an injector in the elbow section that injects liquid into the elbow section toward the eccentric reducer section.

An apparatus for blasting a media onto a surface comprises an oscillating nozzle, a mount and a power source. The mount attaches the nozzle to tooling, enabling the nozzle to be raised and lowered about a vertical axis, and enabling the nozzle to be repositioned about a horizontal axis. The power source enables the nozzle to oscillate. The blasting media is sprayed through the nozzle onto the surface. The oscillating nozzle projects an enlarged dispersion pattern of the blasting media onto the surface being treated. The apparatus may include a basket positioned near the mount, enabling an operator to be positioned upon a truss and control the blasting of the media onto the surface, the basket being mounted via a swivel bearing, enabling the basket to self-level. Also, the media blasting apparatus may be controlled by an operator positioned in a remote control computer area.

The present disclosure provides a trenchless multi-stage pipe cleaning device and method combining an artificial tornado and dagger-like mechanical sand. The trenchless multi-stage pipe cleaning device includes a primary pipe cleaning device and a secondary pipe cleaning device that are connected. An outer wall of the pipe cleaning device is provided with multiple air inlet joint pipes evenly distributed in a circumferential direction. The air inlet joint pipes are connected to an air compressor. Each of the air outlet joints is connected to a nozzle. The primary pipe cleaning device is connected to a vibrating screen. The trenchless multi-stage pipe cleaning device further includes a back-end sewage discharge device. The trenchless multi-stage pipe cleaning method includes: supplying compressed air into an inner chamber of the primary pipe cleaning device to mix with mechanical sand, so as to form a primary gas-solid mixed flow; allowing the primary gas-solid mixed flow to enter the secondary pipe cleaning device; forming an artificial tornado by multiple streams of diagonally tangential high-speed air entering an inner chamber of a secondary pipe cleaning device body; changing, by the artificial tornado, a movement trajectory of the primary gas-solid mixed flow into a spiral shape, tangential with an inner wall of a cleaning target; and driving the primary gas-solid mixed flow to move forward to form a secondary gas-solid mixed flow; where during this process, the mechanical sand continuously scrape and collide with the inner wall of the cleaning target, so as to achieve a desired efficient trenchless water-free pipe cleaning effect.

This application relates to the technical field of coal-fired boilers, and provides a method and an apparatus for improving steam oxidation resistance of a small-diameter boiler tube in a coal-fired boiler. The method includes the following steps: cutting a boiler tube panel from a ceiling of the boiler, vertically hoisting and fixing the boiler tube panel, and cutting out a section from a bottom portion of a lower bend of the boiler tube panel; cleaning an inner tube wall of each tube body in the boiler tube panel; performing oxidation resistance coating sintering on the inner tube wall of each tube body in the boiler tube panel; and performing a welding repair on each tube body in a sintered boiler tube panel. All construction processes of this method can be completed in a furnace during shutdown and maintenance, production efficiency is high, and maintenance duration can be significantly reduced. In addition, a steam oxidation resistance layer can be formed on an inner wall of the small-diameter boiler tube, so that a steam oxidation resistance capability of a small-diameter boiler tube in a service coal-fired boiler can be greatly improved.

The disclosure relates to the cleaning of oilfield tools made of metal, particularly to the method of reclamation oilfield tools, already used in the mechanical deep-pumping extraction of oil, as well as to the product made with the help of the mentioned method. The method of remanufacturing of standard length rods includes cleaning the rod with at least one cryogen to eliminate environmental contamination and to assist in workplace safety.

A trenchless multi-stage pipe cleaning device and method combining an artificial tornado and dagger-like mechanical sand is provided. The trenchless multi-stage pipe cleaning device includes a primary pipe cleaning device and a secondary pipe cleaning device that are connected. An outer wall of the pipe cleaning device is provided with multiple air inlet joint pipes evenly distributed in a circumferential direction. The air inlet joint pipes are connected to an air compressor. Each of the air outlet joints is connected to a nozzle. The primary pipe cleaning device is connected to a vibrating screen. The trenchless multi-stage pipe cleaning device further includes a back-end sewage discharge device. In the trenchless multi-stage pipe cleaning method, the mechanical sand continuously scrape and collide with the inner wall of the cleaning target, so as to achieve a desired efficient trenchless water-free pipe cleaning effect.