Introduction to the complete process of plate heat exchanger repair_
Introduction to the complete process of plate heat exchanger maintenance
The complete process introduction of 789 plate heat exchanger maintenance, including preparation before disassembly, disassembly process, replacement of rubber pads and plate cleaning, plate defect inspection, plate assembly requirements, hydraulic test, etc., click Explain the complete process of specific plate heat exchanger maintenance. It is recommended that professional plate heat exchanger maintenance personnel come in and operate. Preparation before disassembly: The maintenance period of the plate heat exchanger is generally about 2 years. Before overhauling, check the heat exchanger as a whole, the aging degree of gaskets, the surface of the equipment, and the adhesive used, etc., and all bolts should be derusted and coated with anti-rust oil, and the entire equipment surface should be cleaned and inspected. Whether the equipment accessories are normal, and record its size for reference when reinstalling. The process of disassembly: When disassembling, wait for the various parameters of the equipment to meet the maintenance requirements and start disassembly. First remove the connecting pipe, and then loosen the bolts in the diagonal direction as when installing. During the disassembly, the width direction deviation of the pressure plate shall not exceed 10 mm, and the vertical direction shall not exceed 25 mm, so that the movable pressure plate is basically kept parallel. When removing the board, as long as the side of the board is offset by an angle of 10-20 degrees, it can be removed, and it must not be removed forcibly to avoid damage to the board. Replace the rubber pad and clean the plate: After disassembling the equipment, remove the old rubber pad first. Be careful when removing it. You can use a hair dryer to heat the bottom of the sealed groove to soften it, and then peel it off slowly. It is forbidden to use acetylene flame for heating. After the gasket is removed, there will be some residual glue, and the residual glue must be removed to keep the seal groove smooth. The cleaning of the plates generally uses manual or chemical cleaning. Steel balls or other sharp objects should not be used to prevent scratches on the plates. The scale on the plate can be cleaned with a soft brush in a special sink, but the water must not contain sulfur, alkali, chlorine and other ingredients to prevent corrosion. Check the defects of the plates carefully to check whether the plates are damaged, and replace them in time to avoid accidents during use. Plate assembly requirements: After the entire equipment is cleaned, when installing the plates, according to the process, place a side without rubber pads against the fixed pressure plate, and then separate the plates according to the interval. Tighten the long bolts when all are hung up. During the installation process, the balance of the movable pressing plate shall be maintained, and the length of the plate stack shall not exceed the deviation after the installation. Water pressure test: Perform a water pressure test after the installation is completed, first slowly increase the pressure to the design pressure and then maintain the pressure for about 30 minutes. During the period, there is no problem and it is qualified. After being qualified, it can be installed and used.