Common stress problems of stainless steel seamless elbows in use mainly include stress generated by installation and stress generated by operation.
Installation stress is mainly caused by improper installation of stainless steel seamless elbows. For example, during the assembly of the pipeline system, the stainless steel seamless elbows and other pipe fittings are forcibly connected without considering the thermal expansion and contraction of the pipeline or the manufacturing tolerance of the elbow itself. Large tensile stress or compressive stress will be generated at the elbow. The installation stress will make the stainless steel seamless elbow in a stress state before it is used. After it starts to be used, it will deform or crack under the action of internal pressure and external load.
Operation stress is mainly caused by various stresses during the operation of the pipeline system. In addition to the stress generated by the internal fluid pressure, there is also the influence of thermal stress. For example, in the thermal pipeline system, the pipeline expands and contracts due to temperature changes. As the part where the pipeline changes direction, the thermal stress will be concentrated on the stainless steel seamless elbow. Once the allowable stress is exceeded, it will deform and crack.