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Water ring vacuum pump was originally used as self suction pump. It is composed of impeller, pump body, suction and exhaust disc, water ring formed by water in the inner wall of pump body, suction port, exhaust port, auxiliary exhaust valve, etc. In many industrial processes, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture regain and vacuum degassing, water ring pump has been widely used. Due to the rapid development of vacuum application technology, water ring pump has been paid attention to in the aspect of obtaining rough vacuum. Because the gas compression in the water ring pump is isothermal, it can extract flammable and explosive gas, in addition to the gas containing dust and water. Therefore, the application of water ring pump is increasing day by day.

The mechanical properties of cast iron parts of water ring vacuum pump are relatively poor, and cracks are easy to occur due to impact, uneven stress or freezing crack. Before repairing, the location and size of the crack must be found out. The simple method of kerosene test is often used to identify the inconspicuous crack defects.

First, one side of the suspicious part is coated with an aqueous solution of chalk powder. After drying, the other side is coated with kerosene. Because kerosene has the ability to penetrate tiny cracks, kerosene can permeate through the parts when there are tiny and inconspicuous cracks, and the kerosene can infiltrate into the white hard powder and change its color. Therefore, we can judge whether there are defects, and the shape and location of the defects according to whether the chalk powder changes color or not, and the shape and size of the color change. The general welding method and epoxy resin bonding crack repair method can be used to repair the part crack.