Abstract:
A heat exchanger with a corrosion resistant, preferably titanium tube (25), housing a medium, usually a refrigerant, surrounded by an outer tube, preferably a flexible PVC see-through spa hose (26), carrying liquid moving in the opposite direction to the refrigerant, to provide a device that is repairable, simple to install or remove, simple to ship, resistant to corrosion, erosion, and UV light damage, to prevent heat exchanger failure in an industry plagued with this problem.
Abstract:
A method of correcting defects in a metal workpeice. A location of a defect in a workpiece is determined. The defect comprising a void or an inclusion in a workpiece substrate. The workpiece substrate is comprised of a metal alloy. Material of the workpiece substrate at the location of the defect is removed to form cleaned area in the workpiece substrate. The cleaned area in the workpiece substrate is coated with a high-density coating. A sintering heat treatment is performed on the coated workpiece substrate to remove entrapped gas from the coating material prior to a step of hot isostatic pressing treating. Then, hot isostatic pressing treating is performed on the coated workpiece to produce diffusion bonding bewteen the workpiece substrate and the high-density coating. The material can be removed by techniques such as sandblasting or grinding. A high-density coating process such as hyper-velocity oxy-fuel thermal spray process or a detonation gun process is used to apply the high-density coating to the substrate at the location of the cleaned area. The high-density coating may have the same metal alloy composition as the metal alloy substrate. The metal alloy substrate may comprise a nickel or cobalt-based superalloy, and the high-density coating may have the same nickel or cobalt-based super alloy composition as the metal alloy substrate.
Abstract:
Disclosed are a method for assembling a polishing while inspecting for air leakage in the polishing head and an apparatus for performing the same. By the present invention, a polishing head may be tested for air leakage at each assembly step thereof, so that the polishing head may be assembled free of air leakage, thereby reducing testing time of the polishing head, and failure of the polishing head due to air leakage may be prevented. The apparatus includes a housing supporting the polishing head and having coupling lines coupled with ends of tubes provided in the assembled polishing head, or the polishing head being assembled. A pneumatic pressure regulating section selectively supplies positive pressure or vacuum to the tubes through the coupling lines. A sensor section detects the pressure and level of vacuum in the tubes. A determining section determines if there is air leakage in the polishing head.
Abstract:
A method for restoring thickness to load-bearing components of gas turbine engines, and for repairing a honeycomb structured gas turbine engine component. A surface of the component such as the backing surface of a honeycomb component after honeycomb removal is roughened and cleaned. A selected build-up material is deposited onto the substrate by high velocity oxy-fuel deposition or low pressure plasma spray. The component is heat treated to enhance the bond between the deposited material particles, and between the deposited material and the substrate by diffusion.
Abstract:
The present invention relates to a method for repairing a turbine blade having a crack in a trailing edge portion of the blade. The method comprises the steps of cutting back a first surface of the turbine blade adjacent the blade trailing edge portion where the crack is located, and cutting back a second surface of the turbine blade adjacent the blade trailing edge portion where the crack is located. Each cut back step comprises cutting back the respective surface by a depth greater than the length of the crack and less than the trailing edge radius to remove the crack and form a cut back trailing edge portion. A compound radius is used to prevent a blunt transition into the trailing edge that would result in aerodynamic losses and to reduce the airfoil root stresses. The method also includes applying a thermal barrier coating to the turbine blade to increase service life. Prior to applying the coating, the tip portion of the turbine blade is modified to account for the change in the thermal characteristics of the turbine blade.
Abstract:
A modular submersible repairing system is capable of dealing with various tasks somewhat inefficiently, though, and of being inserted and installed in a reactor instantly, and highly maneuverable. A repairing method is carried out by the modular submersible repairing system. The modular submersible repairing system comprises a working unit including at least one type of tool module (1) capable of repairing structures in a reactor, a scanning/pitching module (2) capable of being selectively connected to or disconnected from the tool module, and provided with a scanning/pitching shaft for scanning or pitching the tool module, a submersible fan module (3) capable of being selectively connected to or disconnected from the scanning/pitching module, and a first buoyant module (4) for keeping the orientation of the tool module; and a base unit including a manipulator module (5) internally provided with an actuator driving mechanism, a adsorbing module (6) capable of being detachably mounted on the manipulator module and of adsorbing to a wall, and a second buoyant module (8) for keeping the orientation of the manipulator module. Each of at least the scanning/pitching module and the manipulator module is provided with a submersible connecting device (18, 21) capable of being operated in water for engagement and disengagement. The configuration and functions of the modular submersible repairing system can be changed or modified according to various purposes of work in the reactor by properly combining those modules. The modules can be connected together in the reactor by remotely operating the submersible connecting devices.
Abstract:
A method for extending the life of the attachments that attach blades to rotors, particularly for aerojet engines. Such a method is notable in that it employs intensive ultrasonic peening of the grooves and of the roots of the blades, this peening being performed with an Almen intensity at least equal to F8A, so as to increase the compressive prestress in the contact surfaces without increasing the roughness of these surfaces.
Abstract:
A stuck locking pin is removed from a turbine rotor by forming an aperture in the locking pin. The diameter of the aperture is less than the diameter of the locking pin, such that a thin shell portion remains in the locking pin receiving slot of the rotor. The locking pin then can be easily removed by any suitable means, such as by driving a high-strength metal rod into the aperture. The driving force stretches the thin shell portion, which easily separates from the rotor.
Abstract:
Apparatus and method of repairing a coolant system associated with an engine for a vehicle, including disconnecting a gooseneck connected to the engine and removing from the engine its thermostat; disconnecting a bottom radiator hose connected to the engine and flushing the engine with water; reconnecting the bottom radiator hose and reconnecting the gooseneck; refilling the engine's radiator with an antifreeze solution; opening a drain valve on the radiator and allowing a predetermined amount of coolant to drain out of the engine corresponding to a volume of a treatment composition to be added, the treatment composition comprising an aqueous silicate mixture comprising 50%-80% sodium silicate, based on a total amount of silicates in the mixture, and 50%-20% potassium silicate, based on the total amount of silicates in the mixture, the total amount of silicates comprising about 40%-50% of the mixture, a glycol in an amount of at least 10% by volume of the composition and the balance being water; starting the engine when the engine is cold, and turning on the engine's heater; adding the composition to the radiator of the engine while the engine is cold and idling; running the engine until the composition causes leakage and/or vapor in the engine's exhaust stream is substantially stopped; and stopping the engine and allowing the engine to cool.
Abstract:
A method and apparatus is disclosed for expanding the ends of a sleeve that has previously been installed into a defective section of inaccessibly located soft metal heat exchanger tubing. The sleeve ends are expanded using an apparatus of a plastic bladder connected to a series of connectable sections of sufficient length to reach the ends of the installed sleeve. The expansion is performed by locating the plastic bladder inside the sleeve at one end and hydraulically compressing the plastic bladder and forcing it to expand in diameter as a function of Poisson's ratio to thus expand the sleeve end into the tube.