Maintenance and repair of clean room refrigeration system

Maintenance and repair of clean clean room modular refrigeration system

If the refrigeration equipment loses its working ability, it should be repaired according to the inspection results. The early warning force of the bolts at the connection of the flange is not appropriate. If it is loose, use a wrench to tighten the nuts symmetrically to make the force even, but not too tight, such as bolts If the deformation or corrosion is serious, the bolts should be replaced; welding...

Text label: clean clean room modular system, refrigeration system maintenance and repair

Maintenance and overhaul of clean clean room modular refrigeration system

If the refrigeration equipment loses its working ability, it should be repaired according to the inspection results. The early warning force of the bolts at the connection of the flange is not appropriate. If it is loose, use a wrench to tighten the nuts symmetrically to make the force even, but not too tight, such as bolts If the deformation or corrosion is serious, the bolts should be replaced; if the welding seam is not tight, it should be repaired by welding; if the flange is warped during welding and does not meet the assembly requirements, it should be turned or replaced; the centerlines of the two flanges are inconsistent during installation. The flanges screwed on by prying the pipe have uneven contact surface, so the pipe should be cut off and re-aligned before welding. When the equipment pipeline is corroded and the thickness is reduced, the inspection should be carried out first. There are two inspection methods: drilling method. When the equipment is corroded, drill a hole with a diameter of 2-4mm in the suspicious place, and then use the hooked wire to probe into the measurement. Make a record. If the repair size is not exceeded, fill the small hole with a tap or seal it with a screw. If the size is exceeded, repair is required; the pipe cutting method, according to the use time of the equipment pipeline and the rust condition, in the off-season of production, When the equipment is overhauled, during inspection, the severely corroded pipeline can be derusted, and the loss of the outer diameter of the pipe can be measured with a vernier caliper. After inspection, if the thickness of the pouring condenser and evaporator is less than 1.5mm, new pipes should be replaced. If the entire balance of the high-pressure container is corroded, it should be replaced in time.

Repair of cracks and pinholes, for equipment with small cracks and pinholes, generally repaired by welding repair, if a wide crack is found on the container, it can be repaired by plate repair , the width of the repair plate should not be less than 250mm, and should be 50-100mm longer than the gap. If gas welding is used to repair the leakage, the welding repair point should not exceed 2 times, otherwise the pipe should be replaced. For the leakage of the tube at the porous steel plate, it can be repaired by welding or replacing a new tube. Generally, the method of welding is not used for the condenser of the expanded tube, and the method of replacing the new tube and re-expanding can be used. If there is no new tube to replace , the method of re-expansion can be used; the leakage of the pipe itself, the number of pipes is not large, because the production cannot be stopped, or when there is no spare pipe, the pipe can be blocked and replaced when it is overhauled; the difference between the inner diameter of the orifice plate and the outer diameter of the pipe The general limit is between 0.25-0.75mm, and it is not allowed to be less than or less than this number to ensure the tightness of the expanded tube. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and clean workshops.

The valves used in the refrigeration system are generally medium-pressure valves. The valves are divided into ammonia valves and fluorine valves according to the working fluid of the system. The ammonia valves are generally made of cast steel or cast iron, while the fluorine valves are made of cast copper or cast iron. Steel, the valve stem is double-sealed with packing and bonnet; the valve is generally easy to leak during use, and its leakage accounts for a large proportion of the leakage of the entire refrigeration system, so it cannot be ignored. In the process of conveying the working medium, due to the large temperature change of the working medium, especially when the valve is closed too tightly, the preheating and expansion will cause the valve stem to bend; the corroded valve stem after bending will cause the valve stem to bend when it is opened and closed. The wear is accelerated, and the sealing packing will also be pulled out, resulting in hard damage and leakage. Therefore, during normal maintenance, the tightness of the valve stem should be appropriate. In refrigeration engineering, for large-diameter valves, the valve core is sealed by a layer of babbitt alloy or fluoroplastic, and the back of the valve core also has a layer of babbitt alloy, which can seal the working medium when it is reversed to the maximum position. Leaks out along the valve stem; when the valve is disassembled, first straighten the valve stem to remove burrs, and then replace the babbitt alloy of the valve core. At the same time, the valve seat should also be ground to make the valve core and valve seat tight to each other; the valve After the overhaul, the air tightness test shall be carried out according to the relevant requirements.

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