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Flexible flexible metal pipes are generally made of stainless steel. Active anions (such as chloride and sulfide ions) in the medium can easily damage the passive film of stainless steel, and small corrosion holes appear on the base metal, which are the active centers generated by pitting corrosion. The surface potential of the metal inside the etch hole is relatively negative, and the surface potential of the metal outside the etch hole is relatively positive, so the inside and outside of the hole constitute an active-passive micro-galvanic corrosion battery. The battery has a large cathode and small anode area ratio structure. The current density is very large, and the corrosion hole deepens quickly.
Flexible Metal Conduit
Flexible flexible metal pipes used at high temperatures must be adjusted according to the working pressure temperature correction factor of the flexible flexible metal pipes at high temperatures, and the rated working pressure must be reduced to ensure safe use.
3. Fatigue failure
In the dynamic working state, the flexible flexible metal pipe is often subjected to fatigue crack damage under the action of cyclic load. Such damage is a normal failure. In order to prolong the service life, it is necessary to ensure that the hose is designed and selected correctly, the installation is accurate, and does not cause additional stress such as twisting of the hose.
4. Water hammer phenomenon
Water hammer phenomenon is a pressure transient process caused by the sudden change of the medium flow state and the change of the fluid momentum in the pipe. It is a special oscillation phenomenon caused by the unstable flow in the pipe. When the pressure wave that rises and falls sharply is transmitted through the pipeline, it will produce a kind of noise as if hitting the pipeline with a hammer, so it is also called water hammer two blade one. When the water hammer occurs, the impact force on the elbow section of the pipeline becomes stronger. Therefore, the user should follow the requirements of the operating regulations, such as slow heating, steady pressure, reducing the amount of instantaneous flow and pressure changes, and avoiding water hammer.
5. Conveying medium
If the conveying medium in the hose has chemical properties (acidic or alkaline) and is prone to electrochemical reactions, the material of each part of the hose should be reasonably selected according to the corrosion resistance parameter table of the hose material.
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