[0032] The present invention will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement it with reference to the description.
[0033] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial sources unless otherwise specified; in the description of the present invention, The terms "landscape", "portrait", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", The orientation or positional relationship indicated by "inside" and "outside" is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the indicated device or element must have The particular orientation, construction and operation in the particular orientation are therefore not to be construed as limitations of the invention.
[0034] like figure 1 As shown, the present invention provides a method for degreasing and cleaning pipelines, which comprises the following steps:
[0035] a. Derusting treatment on the inner wall of the pipeline: use oil-free compressed air to push the leather bowl steel brush pig to move in one direction in the pipeline, wherein one end of the leather bowl steel brush pig is a sealed rubber ring, and the The rubber ring is in contact with the inner wall of the pipe, a rotatable cylindrical magnetic body is arranged on the rubber ring, the axis of the cylindrical magnetic body is coincident with the axis of the pipe, and the axis of the cylindrical magnetic body is coincident with that of the pipe. The surface is provided with a steel brush to clean the inner wall of the pipe.
[0036] Specifically, a leather bowl steel brush pig is installed into the launching device, and the pressure value is set according to experience. The leather bowl steel brush pig moves in the pipeline at a suitable speed under the push of compressed air. During the moving process During the process, the cylindrical magnetic body rotates to drive the steel brush to rotate, and scrape the inner wall of the pipeline with great force, so that the mechanical residues such as rust, rolling scraps, welding slag and other mechanical residues adhering to the inner wall of the pipeline are peeled off. The mechanical residual substances after peeling are adsorbed and sent to the cylindrical magnetic body, and the substances that are not adsorbed on the cylindrical magnetic body will also be pushed out of the pipe by the leather cup, so as to obtain higher cleanliness. It should be noted that, in order to prevent the steel brush from being attracted by the cylindrical magnetic body, the steel brush is made of austenitic stainless steel, and the steel brush and the cylindrical magnetic body are detachably connected to be selected according to the pipe material. Bristles of the same material, similar hardness, and different densities.
[0037] b. Dust removal treatment in the pipeline: Put the foam pig into the launching device, use oil-free compressed air to push the foam pig to remove the residue in the pipeline, and repeatedly launch the foam pig until the foam from the receiving device is cleared. The particle permeability of the tube is less than the preset value.
[0038] Specifically, particles will still adhere to the inner wall of the pipeline cleaned by the leather bowl steel brush pig. In order to completely remove these particles, a foam pig is used to clean the pipeline, and the foam pig is repeatedly launched until the foam from the receiving device is received. If the particle permeability of the pig is less than 5mm, it is considered that the dust removal in the pipeline is qualified.
[0039] c, Degreasing treatment of the inner wall of the pipe.
[0040] It should be noted that long-distance oxygen and other oil-avoiding medium pipelines are long, mostly several kilometers, and some even tens of kilometers. Before the pipeline is completed and put into operation, it must be degreased and cleaned to avoid explosion accidents during use.
[0041] Specifically, the step of degreasing treatment includes:
[0042] In step c1, a degreasing train with a liquid-inclusion pig is used to move in one direction in the pipeline under the push of oil-free compressed air, to remove the grease in the pipeline and wash the inner wall of the pipeline with water;
[0043] In step c2, the liquid clipping pig is repeatedly launched until the degreasing test is qualified.
[0044] d, the inner wall of the pipeline is dried.
[0045] Specifically, the interior of the pipeline is intermittently purged with compressed air, wherein the interval between each purge and discharge is set according to the length of the oxygen pipeline, and the interval time is generally greater than 20 minutes. Air purging should try to use the large compressor and gas storage tank in the system to accumulate pressure. The purging pressure should not exceed the design pressure of the gas storage container and pipeline, and the flow rate should be greater than 30m/s.
[0046] e, Pipe finished product protection.
[0047] Qualified pipelines should be sealed and protected, and no modification operations such as cutting and opening should be carried out. When modification operations must be carried out, methods such as mechanical cutting or opening can be used. Back-sealing welding shall be carried out, otherwise, the pipeline shall be partially segmented and processed according to the original requirements. Further, if the dried pipeline cannot be put into use in time, it is necessary to temporarily protect the pipeline with inert gas pressure to prevent the pipeline from being eroded by the external environment.
[0048] In a preferred embodiment of the present invention, before the step c1, it further includes:
[0049] Step c01, adopt the ultraviolet lamp device with camera to move at a constant speed in the pipeline, and transmit the video data to the terminal in real time;
[0050] Step c02, the terminal marks the positions of key oil stains in the pipeline according to the analysis of the video data, and records them as oil stain marks;
[0051] Step c1 includes:
[0052] The degreasing train using the liquid-inclusion pig is driven by oil-free compressed air to move in one direction in the pipeline to remove the grease in the pipe and wash the inner wall of the pipeline. When the point is marked, the control pig is reduced to the preset speed to move.
[0053] In this embodiment, before degreasing the inner wall of the pipeline, an ultraviolet lamp device is used to analyze the oil pollution on the inner wall of the pipeline, and the position of the area with heavy oil pollution is obtained. During the process, the pressure value is controlled and the speed of the train is adjusted, so that the degreasing liquid stays for a long time in the area with heavy oil pollution, so as to ensure the cleaning effect, ensure the completion of one-time degreasing, and reduce the process. Specifically, when the end section of the last ball is irradiated under an ultraviolet lamp, no oily light is qualified for the degreasing test. Or, when the end of the last ball is sliced and the oil content is not more than 125mg/㎡ detected by the oil concentration analyzer, the degreasing test is qualified.
[0054] In an embodiment of the present invention, the liquid-inclusion pig degreasing train includes first, second, third and fourth skin-cup pigs sequentially arranged along the moving direction of the liquid-inclusion pig. A water-based degreaser is placed between the pig and the second pig pig, the neutralizer used with the water-based degreaser is placed between the second and third pig pigs, and the third and fourth pigs Clean water is placed between the pigs, wherein the water-based degreaser, the neutralizer and the clean water are of the same volume.
[0055] Because the water-based degreaser has a small corrosion rate, is non-flammable and non-explosive, and the corrosion amount per square meter per hour is less than 1 mg per hour, it will not cause harmful corrosion to the pipeline during the cleaning process, and the degreasing effect is good. Environment friendly. In addition, neutralizing the water-based degreaser with a neutralizer on the inner surface of the degreasing pipeline can make the PH of the inner wall of the pipeline reach 6-9 to prevent the degreaser from remaining; To thoroughly clean the inner wall of the pipeline to prevent chemical residues, so as to avoid corrosion of the pipeline.
[0056] Specifically, the water-based degreaser, by weight, included 2.3% trisodium phosphate, 1.2% sodium hydroxide, and 0.4% surfactant; the neutralizing agent was compounded by 2.3% phosphate and 1.2% polyphosphate match.
[0057] In another embodiment of the present invention, the step a includes:
[0058] In step a1, a magnet is arranged on the welding mouth of the oxygen pipeline, and a Hall device is arranged on the leather bowl steel brush pig;
[0059] Step a2, use oil-free compressed air to push the leather bowl steel brush pig to move in one direction in the pipeline;
[0060] In step a3, when the Hall device encounters the magnet on the welding junction, it sends a control signal to the compressor to control the steel brush pig to stop moving until the steel brush is used to continuously clean the inner wall of the pipeline for a preset time.
[0061] In the process of pipeline welding, many mechanical impurities are often generated, so special cleaning is required at the welding place. The welding position is positioned by the Hall device to control the steel brush pig to stay in the welding place for a period of time, so that the steel brush This area can be cleaned more to improve cleanliness. It should be noted that since the cylindrical magnetic body on the steel brush pig pig is sensed by the Hall device, the signal should be processed when detecting the magnetic parts on the welding joint, so as to accurately judge the magnetic substances on the pipeline. . Of course, other ways can also be used to locate the welding place.
[0062] In order to achieve these objects and other advantages according to the present invention, a degreasing and cleaning device is also provided. One end of the degreasing and cleaning device is a sealed rubber ring, the rubber ring is in contact with the inner wall of the pipe, and the rubber A rotatable cylindrical magnetic body is arranged on the ring, the axis of the cylindrical magnetic body is coincident with the axis of the pipe, and the surface of the cylindrical magnetic body is provided with a steel brush to clean the inner wall of the pipe.
[0063] The degreasing cleaning device proposed by the present invention can move in the pipeline at a suitable speed under the push of compressed air. During the moving process, the cylindrical magnetic body rotates to drive the steel brush to rotate, and scrape the inner wall of the pipeline with great force. , so that the mechanical residues such as rust, rolling chips, and welding slag adhering to the inner wall of the pipeline are peeled off. The mechanical residual substances after peeling are adsorbed and sent to the cylindrical magnetic body, and the substances that are not adsorbed on the cylindrical magnetic body will also be pushed out of the pipe by the leather bowl, so as to obtain a higher degree of cleanliness, so that the subsequent use of water-based degreasing agent , neutralizer and clean water to prepare the pipeline for degreasing and cleaning in turn.
[0064] Preferably, the steel brush and the cylindrical magnetic body are detachably connected to select bristles of the same material, similar hardness and different densities according to the pipe material.
[0065] Although the embodiment of the present invention has been disclosed as above, it is not limited to the application listed in the description and the embodiment, and it can be applied to various fields suitable for the present invention. For those skilled in the art, it can be easily Therefore, the invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the appended claims and the scope of equivalents.
