Plate Heat exchanger manufacturer, industry solution expert

Maintenance and cleaning method and process of plate heat exchanger gasket_

by:DIGUANG     2021-04-21
Repair and cleaning method and process of plate heat exchanger sealing gasket

2020-03-19 10:58
436 plate heat exchanger gaskets are prone to failure, aging, and deformation after long-term use without maintenance, which affects the actual use effect. Therefore, we must regularly repair and clean the gaskets. For aging and damaged gaskets Replace it in time, and clean the dirty gasket in time. Let's take a look at the maintenance and cleaning method and process of the plate heat exchanger gasket. When removing the plate, make the plate skew 15°-20° to one side, and it can be removed by a slight upward lift. It must not be disassembled forcibly to prevent the upper positioning groove from being deformed or damaged, and then follow the order of the piece device. Good code. For plates with severe deformation, aluminum or copper models can be used for correction. When checking the heat exchanger plates, the plates should be free of defects such as cracks, scratches, deformation, etc., the uneven thickness of the plate should not exceed 5%, the periphery of the plate should be lubricated and flat, the shape of the sealing groove should meet the requirements of the pattern, and the depth of the plate should allow the error It is 0.1mm, and its sealing surface is not allowed to have defects such as bumps, wrinkles, distortion, scratches, etc., which affect the sealing function. The corrugation depth of the plate is allowed to have an error of ±0.2mm, and its unevenness shall not be greater than 1%. In the process of disassembling, the width direction deviation of the movable platen should not exceed 10mm, and the deviation of the straight direction should not exceed 25mm, and the movable platen should always be kept moving in parallel. After the system gas, pressure, temperature and other parameters reach the repair requirements, it can enter the construction site. The adhesive used should also be within the useful life. Regarding the perforated plates, hydrogen arc welding can be used to repair and flatten. Before disassembling, close the medium inlet valve, and close the high-pressure side valve first, and then close the outlet valve, so that the heat exchanger is slowly cooled to 40°C before discharging, and then the connected pipes are removed and the whole is lifted. Because the plate heat exchanger has a large number of plates, and it must be sorted one by one, and all the new pads are replaced, the overall lifting device orientation is generally selected during the overhaul, and the overhaul is collapsed in a suitable place. When the scale on the plate is very thin and the scale layer is easily soluble in water, the plate can be placed in a special water tank and scrubbed with soft fiber brown wool. It can also be washed with 1-29cg/cmz pressure water or low-pressure steam. Do not use acetylene flame heating under any circumstances. Before overhaul, the gaskets to be replaced need to be carefully checked. The appearance should be lubricated, the thickness should be common, there should be no transverse cracks, no bubbles, no gaps, no aging, no signs of overlap and butt joints. Remove the old gasket first, and then loosen the fixing bolts in the diagonal direction. The combination of various methods can meet the needs of different working conditions and is more targeted in application. One hand holds the electric heating wind along the bottom of the sealing groove to heat, and when the adhesive becomes softened by the heat, the other hand pulls up the mat and slowly peels it off. After the gasket is removed, the residual glue in the sealing groove can be installed on a tangential grinder with a stainless steel wire wheel with a diameter of 40-50mm and a width of 8-10mm to grind away the residual glue to ensure a smooth and clean sealing groove. For the heat exchanger body, remove the compression bolt protection sleeve, and derust and oil all the bolts; check the sliding surface of the upper beam and scrub it clean; check the upper roller on the movable platen to make it move sensitively; measure and stack Length 'AAnother example is that the temperature and pressure resistance of the welded plate heat exchanger is significantly better than that of the detachable plate heat exchanger, which can reach 250°C and 2.5MPa. The above is the description of the maintenance and cleaning method and process of the plate heat exchanger gasket, I hope it will be helpful to you. For more information on the model and brand of plate heat exchanger gaskets, please visit the official website of Diguang Heat Transfer. Welcome everyone to browse.
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