With more and more skyscrapers rising from the ground, the problem of high-rise fire protection has become more and more prominent. As far as current technology is concerned, the general fire-fighting height of domestic ladder fire trucks can only reach 200 meters, which is more than 200 meters. , The fire can only be fired through the fixed fire extinguishing inside the building, the response speed and fire fighting efficiency are low, and the high pressure fire water pump came into being.
In the process of using the high pressure fire water pump, there will be many failures. However, the occurrence of failure is not accidental. On the contrary, there is a basis. For example, if the impeller is damaged, it may cause blockage, slow down the operation of the fire pump, or become too serious to operate.
In addition to simply protecting the internal system of the fire pump, the pump casing of the fire pump can also realize energy conversion, effectively converting kinetic energy into pressure energy, and connecting other components into a whole, playing a supporting role. In addition, the pump casing of the fire pump also plays the role of evenly introducing the liquid into the impeller, and also collects the liquid that is transferred from the impeller at a high speed, so that it is sent into the outlet to play the role of export. For this reason, the material of the pump casing of the fire pump is not arbitrarily selected. Generally speaking, the casing material of fire pumps needs to meet the following requirements.
1. The material selected for the pump casing must have sufficient strength and rigidity;
2. The selected material is as light as possible;
3. The selected material needs a high degree of tightness;
4. The surface of the selected material should be smooth and clean, and it can be used for a long time and is not easy to wear;
5. The selected material needs a high degree of corrosion resistance.
Generally speaking, most of the fire pump casings are cast iron parts, because the hardness is enough, so even if the cast iron fire pump casing is not light, it is widely used. The fire pump casing made of iron may crack due to mechanical or thermal stress. So it is very prone to failure. In addition, the pump casing of the fire pump is painted with red paint to protect the pump casing from external corrosion.
Under special circumstances, such as the fire pump site is a chemical plant, used for the transportation of special corrosive media, the pump casing of the fire pump will be made of stainless steel. So as to avoid corrosion of the pump casing. But even the fire pump casing made of stainless steel is easy to rupture when it is frozen due to the impact of cavitation during work or the water in the pump casing is not released in winter. If the damage is serious, the pump casing needs to be replaced. .
It is recommended to inspect the pump casing every 3 months to effectively ensure that the fire pump is not affected by the pump casing. Even as a protection, the fire pump casing needs to be taken care of!