Plate Heat exchanger manufacturer, industry solution expert

An effective way to remove and replace the rubber pad of the plate heat exchanger after it is used_

by:DIGUANG     2021-04-06
An effective way to remove and replace the rubber pads of plate heat exchangers after they are worn out

2018-11-22 13:32
The effective method for removing the rubber gasket of 797 plate heat exchanger after it is used. When inspecting the heat exchanger plates, the plates should be free of defects such as cracks, scratches, deformation, etc., and the deviation of uneven plate thickness should not exceed 5%. The periphery of the heat exchanger rubber gasket should be smooth and flat. The shape of the sealing groove should meet the requirements of the drawing. The allowable deviation of its depth is 0.1mm. The sealing surface is not allowed to have irregularities, wrinkles, distortions, scratches and other defects that affect the sealing performance. The allowable deviation of corrugation depth is ±0.2mm, and its unevenness shall not be greater than 1%. During the disassembly process, the width direction deviation of the movable pressing plate shall not exceed 10mm, and the vertical deviation shall not exceed 25mm, and the movable pressing plate shall be kept basically moving in parallel. The maintenance of the plate heat exchanger needs to be carried out by a professional company, and professional plate heat exchanger maintenance services are provided. After the system gas, pressure, temperature and other parameters meet the maintenance requirements, the on-site construction can be entered. The adhesive used should also be within the validity period. For perforated plates, hydrogen arc welding can be used to repair and flatten. Before disassembly, the medium inlet valve should be blocked, and the high-pressure side valve should be blocked first, and then the outlet valve should be blocked, so that the heat exchanger is slowly cooled to 40°C and then discharged, and then the connected pipes are removed and the whole is lifted off. Therefore, it is also a plate heat exchanger. Because of its diversity, it can be used in a wider range of fields and can be used in most heat exchange processes. If these defects cannot be dealt with, the overhaul of the plate heat exchanger will be disintegrated. Due to the large number of plates in the plate heat exchanger, it must be cleaned piece by piece and replaced with new pads. Therefore, it is generally used to lift off the installation position as a whole during overhaul, and disassemble it at a suitable place for overhaul. 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 sink and scrubbed with soft fiber brown wool, or washed with 1-29cg/cmz pressure water or low-pressure steam. The use of acetylene flame heating is prohibited under any circumstances. Before maintenance, the gasket to be replaced must be carefully inspected. The surface should be smooth, consistent in thickness, free of transverse cracks, no bubbles, no gaps, no aging, no signs of overlap and butt joints. First remove the connection pipe, then loosen the fixing bolts in the diagonal direction, and remove the old gasket first. The combination of various forms can meet the needs of different working conditions and is more targeted in use. 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. The overall disintegration of the heat exchanger. After removing the rubber pads and gaskets of the plate heat exchanger, the residual glue in the sealing groove can be installed on the 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 sealing. The groove is bright and clean. For the heat exchanger body, remove the compression bolt protection sleeve, and apply oil to all the bolts; check the sliding surface of the upper beam and wipe it clean; check the upper roller of the movable platen to make it flexible; measure and stack Length 'AAnother example is that the temperature and pressure resistance of welded plate heat exchangers is significantly better than that of detachable plate heat exchangers, which can reach 250°C and 2.5MPa. According to the assembly method, the plate heat exchanger can be divided into detachable, welded, brazed and other forms; according to the corrugation of the heat exchange plate, it can be divided into herringbone wave, flat wave, spherical wave, etc.; according to the gasket can be divided into Adhesive type and buckle type.
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