Steel elbows formed by hot pressing or forging processes are stainless steel elbows. Stainless steel elbows are welded to steel pipes by butt welding. The two workpieces are welded together along the entire end face through resistance heating. There are usually two methods of resistance butt welding and flash butt welding. They have high productivity and are easy to achieve automation, so they have been widely used. When using ball valves, stop valves and gate valves with stainless steel elbows, It is not allowed to be used for flow regulation. It can only be fully opened or fully closed to avoid corrosion of the sealing surface and accelerated wear. The gate valve and threaded stop valve are equipped with reverse sealing devices inside. The handwheel should be turned to the upper position and tightened to prevent the medium from leaking from the packing.
Most stainless steel elbow fittings are used for welding. To improve the welding quality, grooves with certain angles and edges are opened at both ends. The surface quality and mechanical properties of the elbow are basically the same as those of the pipe. To facilitate welding, the steel of the pipe to be connected should be the same. Stainless steel elbows can resist the erosion of various chemical media except for a few hydrogenation agents.
Stainless steel elbows are a relatively common type of industrial equipment at present. After long-term use, scaling may occur. If the scaling is severe, it will affect the normal use of the equipment. Therefore, we should take some measures to solve this problem and make the equipment more effectively used.
1The hardness of circulating cooling water
The operation process of circulating water in the equipment is quite similar to that of the boiler water in a low-pressure hot water boiler. Therefore, managing water quality in accordance with the water quality standards for hot water boilers can not only prevent scaling on stainless steel elbows but also prevent corrosion.
2Temperature control of circulating cooling water
The temperature difference between the water ring inside the stainless steel elbow and the water temperature of the softened water tank is an important factor leading to scaling. Therefore, increasing the circulating water supply volume to enhance the cooling effect is an important guarantee for minimizing the scaling rate to the greatest extent.
Therefore, during the operation of the circulating cooling water, it is also necessary to monitor the return water temperature and return water volume of each stainless steel elbow to ensure that the normal water supply volume and return water temperature of each pump do not exceed the limit40℃The regulations. The water supply volume can be controlled by valves. If the return water temperature exceeds the specified limit, measures such as supplementing low-temperature cold water or using other heat dissipation and cooling methods should be taken to lower the temperature of the softened water in the softening water tank.
3Regularly flush the pump body
The drain gate valve of the pump body is not only used to normally discharge the accumulated water inside the pump, but also can use the water pressure generated by the operation of the pump body to regularly flush the dirt and water sludge inside the pump during operation. On the one hand, it can prevent the accumulation of dirt, and on the other hand, it can also prevent water sludge from transforming into scale.
The above is an introduction to the methods of preventing scaling on stainless steel elbows. To prevent the impact and harm caused by scaling on equipment, we should keep abreast of the usage progress of the equipment in a timely manner during daily use. Once scaling occurs, we should promptly carry out cleaning and maintenance work. Only in this way can the service life of the equipment be prolonged.
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