Abstract: An apparatus for removing an obstruction within a pressurized fluid service pipeline which includes a flexible rod; a module for connecting to the service pipeline in which the module defines a channel and a first opening in which the first opening communicates with and between the service pipeline and the channel and permits the channel to receive the pressurized fluid from the pipeline in which the module defines a second opening which communicates with and between the channel and an outside of the module; and a flexible seal in which the seal defines an opening and in which the seal is positioned to abut the module and align the opening of the seal with the second opening for receiving the insertion of the flexible rod through the opening of the seal to engage the obstruction in the pipeline, in which at least a portion of the flexible seal engages the flexible rod inhibiting the pressurized fluid in the channel from moving along the flexible rod to the outside of the module, and in which at least a portio

Abstract: The present invention involves the removal of catalyst particles adhering to catalyst tubes by means of automated ram rods. The rods are moved up and down in the catalyst tubes by means of rotating wheels having cams which cyclically raise and drop the rods.

Abstract: A method for preventing formation of a sediment layer at the bottom of a tank containing a liquid mixture such as crude oil, refinery products and petrochemical products which tends to form a precursor in the form of a thickening precipitation zone above the bottom. The deposit of sediment is prevented by disturbance of the precipitation zone. The disturbance is created in the form of an overall disturbance pattern with local disturbance regions with vibrating bodies such as strings or bells strings excitable to vibrate and immersed in the liquid mixture. Exciting elements including push and pull units cause the strings or bells to vibrate in fundamental and harmonic overtones and deflect components of the mixture as a function of the amplitude of said sound wave components.

Abstract: A cleaning plug for cleaning and preventing contamination from entering the interior of a piece of tubing. The cleaning plug is compressible such that it may be compressed to a size smaller than the interior of the tubing and inserted into the tubing without abrading or otherwise leaving contamination on the interior walls of the tubing. The cleaning plug is then allowed to expand such that it contacts and forms a seal with the interior wall of the tubing. The cleaning plug is made from a material which is nonabrasive, non-contaminating and nonreactive with liquids to be passed through the tubing. When used for preventing contamination from entering the tubing, the cleaning plug is inserted adjacent to the opening of the tubing. When used for cleaning, the cleaning plug is inserted into the tubing and moved longitudinally along the inside of the tubing to mechanically remove any contamination.

Abstract: A novel method for cleaning high precision optical equipment. The method involves applying a curable coating to an optical or optical forming surface which has been contaminated with undesirable foreign matter, then allowing the coating to dry to form a resilient dried film, and then removing the dried film to remove along therewith the undesirable foreign debris which has contaminated the optical surface. Preferably, the curable coating is formed from an aqueous polyurethane emulsion. The method allows foreign debris to be removed with a very high degree of reliability and completeness, so that when the method is used with compact disc stampers, the stampers are restored to a like new condition.

Abstract: A method for treating liquid stored in a tank includes the steps of installing a liquid jetting device having a nozzle in a tank, providing the device with separate power sources for swinging the nozzle in the vertical and horizontal directions, jetting liquid from the nozzle at high pressure, monitoring the jetting of liquid from outside the tank, and controlling the power sources from outside the tank. The liquid jetting device used in the method includes a frame mounted on the tank, a casing provided to be swingable inside the frame, a first shaft extending laterally inside the casing, a jet nozzle for jetting liquid provided to be swingable by the first shaft in a direction perpendicular to the swinging direction of the casing, a first power source for swinging the casing, a second power source for swinging the jet nozzle in the direction perpendicular to the swinging direction of the casing, and means enabling the driving of the first and second power sources to be controlled from outside the tank.

Abstract: A method of treating an inner surface of a high-pressure gas vessel is disclosed. In the method, abrasive containing rust preventive is charged into the vessel made preferably of manganese steel or chrome-molybdenum steel and a wet-grinding step is carried out to obtain a maximum inner surface roughness of the vessel of 3 .mu.m or less. Thereafter, the inner surface is rinsed with an acidic rinsing solution.

Abstract: The invention is an expandable pipeline pig for separating different liquids and gases in a flexible oil/gas export riser feeding to a larger diameter rigid oil/gas export pipeline.

Abstract: An apparatus and a method for cleaning the inner wall of a pipeline, which includes providing a pig component, of the type having a pig body, a plurality of spacers around the pig body, the spacers making contact with an inner surface of the pipeline wall, a forward end of the pig having a plurality of pressure nozzles positioned thereon for allowing fluid under pressure to flow therefrom onto the inner wall of the pipeline; a bore through the pig body extending from an opening in a rear end of the pig, to the forward end of the pig; a valving member on the forward end of the pig for moving to the open position to allow the fluid to flow to the pressure nozzles when sufficient fluid pressure is placed on the valving member; providing a fluid under pressure, such as water or chemicals, to the rear and front of the pig, the fluid forcing the pig to move forward under pressure; encountering an obstruction, such as paraffin, formed along the inner wall of the pipeline fo such amount to hinder the forward movement

Abstract: A portable launcher/receiver which allows the high capital costs of pigging facilities to be distributed over a plurality of sites. The launcher is transported to the site on a mobile trailer to a docking station where it is aligned with and is releasably connected to an inlet section of a pipeline. A pig is then launched from said launcher/receiver into the pipeline through the inlet section. After the pig has been launched, the launcher/receiver is drained of fluids and is then disconnected and removed from inlet section and can then be moved to another site to launch or receive another pig.

Abstract: An assembly for cleaning a tube bundle including a plurality of elongated tubular lances movable within an outer shell. A flexible fluid hose within the shell extends to the manifold in the lower portion of the assembly, which in turn transmits pressurized fluid to the plurality of lances. The hydraulic motor powers a rack and pinion assembly to reciprocate the lances, while a plurality of spring biased plates each cover a slot in the lance housing. The assembly of the present invention utilizes a receiving manifold and a lance manifold connected by a plurality of nipples for a desirable low pressure drop. A pair of series connected valves allows the hydraulic fluid flow and the pressure to the drive motor to be separated controlled.

Abstract: Polar-side-group-containing extrusion adjuvants, such as ethylene diamine tetraacetic acid or ionomer, that counteract the deleterious effect of certain additives such as zinc stearate, used in polyolefins on the performance of fluoropolymer processing aids in polyolefins are taught.

Abstract: A method for cleaning furnace headers using a cleaning module for cleaning pipes, having a flexible body with a cleaning surface and a nose at each end, the nose being tapered to a tip. The dimensions of the cleaning module are such that the ratio of the overall length to the diameter is about 1.5 to about 1.75 and the ratio of overall length to nose length is about 5 to about 10.

Abstract: A decontaminating apparatus for removing a layer of contaminated material, such as radioactively contaminated concrete, includes two material removing devices which are driven, alternately, towards and away from one another. Each material removing device includes two rotatable scabbling drums enclosed in a shroud from which removed material is conveyed to a waste collection skip. The material removing devices are mounted at the free ends of two pivotable arms arranged to be driven in mutually opposite directions by a common drive mechanism. A frame supports the two material removing devices, the frame being connected to an articulated arm which extends from a remotely-operated vehicle. The vehicle is located on a platform which can be raised and lowered to facilitate access by the material removing devices to the entire surface under treatment.

Abstract: A method of removing animal growth organisms and such foreign material from the inside surface of an underwater pipe extended at its outlet end into a wet well at a pumping shore station, by inserting a bladed cleaning device in the pipe at the wet well and pulling it to a spaced inlet end of the pipe, the cleaning device having stationary rigid circumferential and radial cutting edges suited to core chuncks of foreign matter free from the pipe surface and dice them into smaller pieces of the foreign material. The method further provides injecting fluid under pressure from the cleaning device toward the bottom of the pipe as a fluid stream of sufficient velocity for raising the foreign matter chuncks and pieces into suspension with water in the pipe, and pulling the cleaning device axially within the pipe back toward the wet well.

Abstract: The present invention provides a process for decontaminating a surface of nuclear or fissile materials or both. The process includes impacting ortho-boric acid crystals onto the surface. The present invention also provides an abrasive media comprising ortho-boric acid crystals having a boron-10 content of at least 19 percent by weight.

Abstract: A method for cleaning an interior cavity of a container including the following described steps. Firstly, insert a hard pliant card with rapid elastic recovery to within 96% of original into an interior cavity of a container. Secondly, exert a force upon the card until the card deforms to assume an arcuate shape substantially conforming with the interior contours of the container. Thirdly, move the card along the interior contour of the container in a scraping action such that an edge of the card scrapes residue from the interior contour of the container.

Abstract: A rod driver is used to drive a rod so as to move a broach through a continuous vacuum chamber in the axial direction. The broach is provided at the leading end of the rod with cutting and finishing edges at a plurality of stages in the axial direction. The cutting edges each have chip breakers in their outer periphery. The broach is moved in the vacuum chamber to cut the inner surface of the vacuum chamber, so that a new surface is formed. During the cutting at least one of an inert gas, nitrogen, and a mixture of the inert gas and nitrogen is supplied to the cutting edges. The outer diameter of the finishing edge is same as the desired inner diameter of the vacuum chamber and the finishing edges are effective in forming such a vacuum chamber with greater precision and the least friction.

Abstract: A process for removing accumulated meltable matter from a pipe includes introducing inside a pipe a cylindrical travelling element or pig made of low density, high elasticity foam. A mixture of reagents which, after a certain period of time will cause a highly exothermic reaction to occur, is introduced inside the pig so that by displacing the pig the meltable deposits within the pipe will melt and will be carried by the pig to a place from which they will be removed together with the pig.

Abstract: A method for cleaning tubes or vessels utilizes a composition which contains a ceramic particulate spherical or conical in shape in an amount of 1-20 wt % of the total composition, and a liquid organic solvent in an amount of 80-99 wt % of the total composition, wherein the ceramic particulate is dispersed within the liquid solvent and wherein the solvent also has present in it N-methyl-2-pyrrolidone in an amount of 1-15 wt % of the total composition.

Abstract: A process for pipe cleaning using a cleaning module which is propelled through the pipe by a hydraulic fluid and has at least two cleaning tips attached in a particular alternating sequence. The hydraulic fluid is inspected to determine when no further abrasive cleaning is required. When such a determination is made, another tip is applied to finish the surface of the pipe.

Abstract: A process cleans inductor channels of furnaces melting non-ferrous metal alloys wherein the coating alloy has a minimum of zinc content of 50% by weight which is subject to softening, dilution and floating of DROSS heavy slag which obstructs the inductor channels. The slag is removed by mechanical action of hammer-shock powered lances with slicing fins presented at a contact end of the lances. Cleaning of the slag is aided by a nitrogen gas stream acting within inductor channels.

Abstract: Cleaning methods for rail cars that haul freight, such as covered hoppers, open hoppers, box cars, tank cars, autoracks, locomotives, flat cars, remove the residue from materials transported by the rail car itself. The rail cars have at least one surface. Freight includes, but is not limited to, agricultural products, industrial products, foodstuffs, living beings, and packaged goods. Methods include the steps of vacuuming excess materials remaining in rail car, removing clinging or otherwise persistent materials with a forced air system, which may be augmented with abrasive materials to a surface of the rail car, and vacuuming up or otherwise removing all remaining dust and debris, and repeating some or all of the steps as necessary. In addition, methods wipe down the surface with a dry rag (e.g., paper or cloth) and/or wipe down the surface with a damp rag. A rag could also be used to apply a sterilizing agent, which would depend upon the application and materials removed and shipped.

Abstract: A method for cleaning bulk bags which have been utilized to transport dry bulk, the method including the steps of providing a first bulk bag to be cleaned; mounting the bulk bag on a frame through its inlet and outlet spouts; providing a vertically inclined brush substantially the same length as the mounted bulk bag; introducing air in the mounted bulk bag from the frame to inflate the bulk bag to its filled configuration; rotating the brush against the wall of the bag which in turn causes the bag to rotate on its axis, thus cleaning the exterior wall of the bag, and shaking material off of its interior wall; suctioning off material removed from the brush; collecting the material from the interior of the bag in a collection compartment; and mounting a second bag on the frame while the first bag is being cleaned; following the cleaning of the first bag, rotating the frame to place the second bag in alignment with the brush; inflating the second bag; and rotating the brush against the wall of the second bag to

Abstract: A method of removing undesired coatings from the interior surface of tubes includes inserting a fluid-dynamically unstable impact head into the tube, providing or maintaining fluid flow through the tube and altering the length of a tether attached to the impact head to move the impact head along the tube. As a result of the fluid flow, the impact head moves chaotically within the tube, impacting the interior surface of the tube and removing undesired coatings therefrom. An apparatus for accomplishing the method preferably includes an impact head, a flexible retaining line and a carriage moveable within the tube, the carriage aiding in the centering of the retaining line.

Abstract: A method for cleaning surgical implements comprising attaching to a support surface a device having a base and upstanding bristles, including at least one sharp vertical edge and a flat top. The bristles of one section are short and rigid, the bristles of the second section are long are relatively flexible, and the bristles of an intermediate section vary in length from short to long with a substantial portion of the intermediate bristles being relatively rigid so that a suction tube can be cleaned by pressing it downwardly over the bristles. The base carries a resilient pad and a securing member such as a double-faced adhesive tape for mounting the unit upon a support surface.

Abstract: A method for cleaning a curing mold to be used for manufacturing elastomer articles, and in particular a cleaning method by removing curing residual of elastomer stuck to the mold without damaging the mold. The method for cleaning the curing mold includes a process of eliminating curing residual of elastomer stuck to the mold in a treatment vessel under plasma conditions.

Abstract: An extension tube system for a dust particulate dispenser and a method of using the extension tube system are disclosed. The system includes a flexible duster extension tube having a central body portion with a first diameter, a first coupling end with a larger diameter, and a second dispensing end with a smaller diameter. Additionally, the second dispensing end includes a dust particulate collection region which serves to prevent dust particulates from spilling out of the duster extension tube when such action is not desired. The first coupling end is inserted over an outlet region of a dust particulate dispenser. Additional extension tubes can be connected to the second dispensing end of an extension tube to extend the reach to an area where dust particulates must be applied. A flexible duster extension tube cleaner having a cleaning element is used to clean remaining dust particulates from within the extension tubes.

Abstract: An apparatus and method for cleaning the tubes of a heat exchanger of a type having at least one header that defines a manifold chamber having a plurality of tubes extending therefrom, the tubes and the header defining tube openings to provide open communication between the tubes and the manifold chamber, the tube openings defining a peripheral seating surface, there being bores in the header, respective ones of which are in register with respective ones of the tube openings, the apparatus comprising a tubular member having a first end and a second end, the tubular member being dimensioned such that the first end can be received through at least one of the bores, a force transmitting lever assembly connected to the tubular member and operatively connected to the header whereby the tubular member can be urged toward the seating surface of a tube opening in register with a bore through which the tubular member is received, there being a seal formed between the tubular member and the seating surface.

Abstract: In an apparatus for detecting a property of a liquid, light is emitted from a light emitting element towards an interface between a liquid to be measured and a prism in an interface channel. Reflected light from the interface is received by a light receiving device, and a refractive index of the liquid is obtained from the total reflection critical angle. A cleaning member capable of contacting the interface by the flow of the liquid is provided. The cleaning member may be a small body or a floating member, a tape/string member having one end fixed to a channel wall, or a wiper swingable by the flow of the liquid.

Abstract: A method and apparatus for cleaning ducts such as used in HVAC systems includes as part of the apparatus a propeller having pitched, flexible blades for rotatably engaging the interior duct surface for dislodging soot and propelling a cloud of soot along the duct to an evacuation point. The method includes establishing a temporary block in the duct, moving the propeller along the duct for dislodging soot and generation a dust cloud, and evacuating the duct by drawing the soot cloud created by the propeller.

Abstract: A novel method and a novel article for cleaning a metal, glass, or plastic surface without scratching or scoring the surface. The novel method includes wiping the surface with the novel article, which is made from an open cell, hydrophilic, static-dissipative, polyurethane foam, and which is laundered so that the article in deionized water releases fewer than 36.0.times.10.sup.6 per square meter of apparent surface area of the article for particles of a size greater than about 0.5 .mu.m and fewer than about 2.5 parts per million of chloride, fluoride, sodium, sulfate, sulfite, or silicon ions. The novel article may be a wiper, a sponge, a roller, a swab mounted on a handle, or a plug having a generally cylindrical shape when unstressed and having particular utility where the surface is the interior surface of a metal, glass, or plastic tube. The plug is propelled through the tube, as by means of compressed air. The novel method also may include washing the surface with deionized water.

Abstract: Preventive maintenance to sewer lines is made more effective by using a predictive knowledge based assessment of those sewer lines most likely needing maintenance. Such predictive methods, are methodically applied to a sewer line system, to provide rodding to those sewer lines in need of maintenance or likely to need maintenance in the near future. Hence, non-problematic sewer lines are identified by default and are not unnecessarily serviced. Sewer lines are identified for preventive maintenance by identifying root intrusion, grease, and grit accumulation sources.

Abstract: A method for cleaning one or more orifice slots (2, 3) of a blow box (1) or similar object particularly in the press or dryer section of a paper machine or similar equipment. The orifice slot (2, 3) is subjected to treatment from inside the blow box by means of one or more mechanical cleaning elements (4) and/or a cleaning jet (8, 9, 23). The invention also concerns an apparatus suited for implementing said method.

Abstract: An apparatus and method for removing debris from the bore of a barrel lock is disclosed. The apparatus is a cleaning tool comprising a handle, the handle having a first end having a rod with a sharp end for picking and dislodging debris and a second end having a rod with a brush for clearing away the debris. The apparatus comprises several alternative types of handles including a hollow handle for storing detachable rods. The rods may be permanently or detachably connected to the handle. The sharp end of the rod may be curved. The invention comprises several means for detachably connecting the rods to the handle.

Abstract: A bladed cylindrical member with high pressure fluid jet nozzles cuts and sweeps aquatic foreign matter from the inside surface of underwater pipes. The method for removing the foreign matter includes reciprocally pulling the device through the pipe and injecting high pressure air into a containment area to force any extricated foreign matter to the surface.

Abstract: A system for cleaning contaminants from small areas with minimal uncontained waste. The invention (10) includes a nozzle (60) having a first aperture for ejecting a fluid and a second aperture for providing suction. The first nozzle ejects a pressurized fluid and the second nozzle provides suction. In a particular embodiment, the first and second apertures are coaxial. Thus, contaminants and residues are dislodged and dissolved by cleaning solvent ejected through the first aperture while the second aperture effectively removes the waste material from a small cleaning area.

Abstract: A fluidized bed gas cooler assembly includes a fluidized bed gas cooler with a metal inlet duct for directing hot process or flue gases into the cooler as fluidizing gas. In order to remove deposits which form on the duct inner surface a cooling fluid is passed into and then out of contact with the outer surface of the inlet duct so that the cooling fluid increases in temperature (but does not change phase) and so that deposits which form on the inlet duct interior surface become brittle and readily disengageable. The deposits are disengaged at different times by pulsation of the cooling fluid (especially where the inlet duct is a metal spiral tube), effecting pulsation of the temperature of the cooling fluid, or subjecting an enclosure surrounding the duct or the exterior surface of the duct itself to a sudden mechanical force.

Abstract: A rubber composition for cleaning a metal mold comprises a rubber, an aminoalcohol, a glycol, an adsorptive, and if desired, an organic silane of the formula, Z.sup.1 -Alk.sup.1 -S.sub.n -Alk.sup.2 -Z.sup.2 where Z.sup.1 and Z.sup.2 are--Si(R.sup.1) (R.sup.2)(R.sup.3) where R.sup.1, R.sup.2 and R.sup.3 are C.sub.1-4 alkoxy, Alk.sup.1 and Alk.sup.2 are C.sub.1 -C.sub.6 hydrocarbylene, n is 2-6, or an organic peroxide having a predetermined half-life due to decomposition.Metal molds are cleaned by bringing the above-mentioned rubber composition into contact with a surface of a dirtied metal mold and heating.

Abstract: A process for cleaning the seats of a double seat valve having two independently movable closing elements, each of the closing elements being associated with a respective one of the valve seats, which closing elements can be moved into simultaneous fully open positions when the double seat valve is in an open state, and at least one of the closing elements is movable to a partly open position independently of the other closing element, in which partly open position a passage is defined between said at least one closing element and the seat associated with said at least one closing element, comprising: periodically alternately moving said at least one closing element to the partly open position and reversing the moving to move said at least one closing element to the closed position in partial stroke movements, the reversing of partial stroke movements of the closing elements from opening to closing movement and from closing to opening movement is done by a control unit in response to the passage of time, to t

Abstract: An extension tube system for a dust particulate dispenser and a method of using the extension tube system are disclosed. The system includes a flexible duster extension tube having a central body portion with a first diameter, a first coupling end with a larger diameter, and a second dispensing end with a smaller diameter. The first coupling end is inserted over an outlet region of a dust particulate dispenser. Additional extension tubes can be connected to the second dispensing end of an extension tube to extend the reach to an area where dust particulates must be applied. A flexible duster extension tube cleaner having a cleaning element is used to clean remaining dust particulates from within the extension tubes. After the dust particulates are dispensed through the extension tube system, each extension tube is disconnected, and the tube cleaner is gripped at one end so that the cleaning element at the other end can be inserted into each flexible duster extension tube.

Abstract: A cleaning preparation for machines for processing plastics, consisting of or containing a powder-form acrylonitrile/butadiene/styrene polymer containing 20 to 80% by weight water which has been obtained from a latex by precipitation with magnesium sulfate or sodium phosphate and a process for cleaning processing machines for plastics in which the cleaning preparation is fed into the processing machine.

Abstract: Methods and additives for purging thermoplastic extruders and associated apparatus are included which involve the addition of a purging additive to a follower thermoplastic resin which additive when heated causes the follower resin to froth as it passes through the unit, the passage of frothed resin thereby causing the removal of the contents of the unit, which contents includes resident resin along with resident additives, degraded materials and any other undesired materials which may be present in the unit.

Abstract: Described is a method and cleaning composition for cleaning tubes or other vessels, comprising a ceramic particulate spherical or conical in shape in an amount of 1-20 wt % of the total composition, and a liquid organic solvent in an amount of 80-99 wt % of the total composition, wherein the ceramic particulate is dispersed within the liquid solvent and wherein the solvent also has present in it N-methyl-2-pyrrolidone in an amount of 1-15 wt % of the total composition.

Abstract: A system for washing a tank and recovering and treating residual tank liquid comprises a first system unit equipped with a suction device for sucking and discharging residual tank liquid, a second system unit equipped with an oil-water separator for separating oil from the discharged residual liquid, a device for treating the separated oil and a pump for supplying a washing liquid into the tank, a third system unit equipped with an inert gas generator, and first, second and third conveyance vehicle for conveying the first, second and third system units to the tank to be treated. The invention also provides a method of operating the system.

Abstract: The present invention relates to a method of removing alkaline earth sulfate scale from the interior surface of downhole production tubing comprising contacting the scale with a solvent having a specific gravity of at least 1.2 while simultaneously milling the scale with a rotating mill head connected to a downhole motor.

Abstract: Hydrocarbon conversion processes having a susceptibility to coke formation on the internal surfaces of processing equipment are improved by inhibiting the formation of coke with the use of a glass bead treatment for the metal surfaces. After treating with ordinary glass bead cleaning methods, metal surfaces are found to inhibit coke formation. The glass bead treatment is easily performed and, therefore, offers advantages over other chemical treatments for the deposition of silica on reactor internals.

Abstract: A method for cleaning the interior of a molding machine having a residual thermoplastic resin after molding comprises the step of cleaning the interior of a molding machine with a cleaning composition which comprises:(A) 100 parts by weight of a thermoplastic resin;(B) 2 to 100 parts by weight of a polyalkylene oxide glycol having a viscosity-average molecular weight ranging from 10,000 to 1,500,000; and(C) 0.5 to 5 parts by weight, per 100 parts by weight of the sum of the foregoing components (A) and (B), of an alkylsulfate represented by the following general formula (I):R.sub.1 --O--SO.sub.3 M (I)wherein R.sub.1 represents an alkyl group having 8 to 20 carbon atoms and M represents an ion selected from the group consisting of K, Na and NH.sub.4 or a fatty acid salt represented by the following general formula (II):R.sub.2 COOX (II)wherein R.sub.2 represents an alkyl group having 7 to 23 carbon atoms and X represents an ion selected from the group consisting of K, Na, Ca, Mg and Zn.

Abstract: A process for use in gas pipelines, where the condensate liquid is withdrawn by passing a cylinder made out of a spongy polymeric material through the pipeline, includes propelling the cylinder by a small pressure difference between the trailing part of the cylinder and the front part of the cylinder, so that the displacement of the cylinder along the interior surfaces of the pipeline pushes the above mentioned condensate. The piston is made out of a spongy material, preferably flexible spongy polyurethane with a density lower than 40 kg per cubic meter so that the piston only suffers a maximum dimensional loss of 0.50% after traveling pipelines with a total length of more than 1000 km.

Abstract: A method for removing radioactive barium sulphate from fluid carrying equipment includes immersing the equipment and scale in liquid nitrogen or other cyrogenic liquid, followed by immersing the equipment and scale in water or other aqueous solution, and subsequent impacting of the equipment and scale to remove the scale.