Elbow is a common connector in pipeline system, which is widely used in various industries, such as oil, natural gas, chemical industry, hydropower, construction, etc. The design of elbow includes not only material and angle, but also the choice of bending radius, which directly affects the resistance of fluid flow and the stability of pipeline system. According to the different bending radius, elbow can be divided into long radius elbow and short radius elbow. So, what is the difference between these two elbows? What occasions are they suitable for?