Views: 0 Author: Site Editor Publish Time: 2023-10-31 Origin: Site
How to repair cracks in fluoroplastic chemical pumps
The fluoroplastic chemical pump is an energy-saving pump. The performance and technical requirements of the pump are designed according to the performance and dimensions stipulated in the standard. The product layout is reasonable, the range of user selection is wide, the maintenance is convenient, and the efficiency and suction lift reach the highest level. Corrosion-resistant and high-temperature resistant, it can transport corrosive media such as acids, alkalis, and oxidants of any concentration (strength) without being damaged. It has high mechanical strength, small size, compact structure, easy use and maintenance, smooth flow channels, high efficiency, and savings. energy. The main reason why it can achieve this purpose is that the material it uses is polyperfluoroethylene-propylene. Products made of this material have good corrosion resistance and good rigidity, as well as excellent impact resistance and distortion resistance. .
Fluoroplastic chemical pumps are widely used in industry, urban water supply and drainage, and can also be used for farmland and orchard drainage and irrigation to transport clean water or other liquids with physical and chemical properties similar to clean water. Fluoroplastic chemical pumps are widely used in corrosive media transportation, chlorine wastewater treatment and acid addition processes in ion membrane caustic soda projects, electrolyte transportation in non-ferrous metal smelting, pickling processes in automobile manufacturing, and pharmaceuticals, petroleum, and electroplating. , dyes, papermaking, food and other industries, it can transport strong corrosive media such as sulfuric acid, hydrochloric acid, nitric acid, aqua regia, strong alkali, strong oxidants, etc. of any concentration under the temperature condition of -20℃~120℃ for a long time without being damaged.
The pump casing of the fluoroplastic chemical pump is an energy conversion closed body. It has to withstand the pressure of the liquid and is also affected by the temperature of the liquid. Cracks often occur due to mechanical stress or thermal stress. Therefore, the pump casing should be inspected regularly. . The inspection and repair methods are as follows:
1. Inspection of cracks:
Tap the shell lightly with a hammer. If there is a cracking sound, it means it has cracked. You should carefully look for the location of the crack in the fluoroplastic chemical pump. If necessary, use a magnifying glass or colored flaw detection method to inspect and determine the location and length of the crack.
2. Crack repair method:
(1) If the crack is in a part that does not bear pressure or has no sealing effect, in order to prevent the crack from continuing to expand, a round hole with a diameter of 3 mm can be drilled at the beginning and end of the crack to eliminate local stress concentration.
(2) If the crack is in a part that is under pressure, the repair method is as follows.
Before welding, drill a small hole at both ends of the crack, then shovel a groove along the crack, and install bolts on the groove to prevent nearby materials from pulling apart during cooling and shrinkage.
The diameter of the additional bolts should be equal to 40% of the thickness of the welded part and should not be greater than 13mm; the distance between bolts should be 2-4 times the diameter, and the drilling depth should be equal to 2-4 times the diameter (but not drilled through) . Use a tap to set the threads, and after tightening the bolts, first build up a layer of welding on the surface, and then gradually and evenly thicken it. After each layer is welded, welding slag and impurities should be removed before welding the next layer. In order to eliminate the internal stress of the welded metal, except for the first layer and the subsequent layer, each layer of the fluoroplastic chemical pump must be lightly tapped with a hand hammer after welding to prevent the weld from cracking.