Flexible Metal Conduit
Metal Conduit
Zhejiang Flexible Technology Co., Ltd.
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What Working Conditions and Environments Should be Paid Attention to for Flexible Metal Conduits?

Feb. 26, 2021

As an Electrical Flexible Conduit Factory, share with you.

1. Corrosion

Coilable metal conduits 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 metal surface potential inside the etch hole is relatively negative, and the metal surface potential 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.


The coilable metal conduit used at high temperature must be adjusted according to the temperature correction coefficient of the working pressure of the coilable metal conduit at high temperature, and its rated working pressure should be reduced to ensure the use under safe conditions.

Flexible Electrical Conduits

Flexible Electrical Conduits

3.Fatigue failure

In the dynamic working state, the flexible metal conduit 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 the hose does not produce additional stress such as twisting.

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 conduit. It is a special oscillation phenomenon caused by the unstable flow in the conduit. When the rapidly rising and falling pressure wave is transmitted through the conduitline, it will produce a kind of noise as if hitting the conduitline with a hammer, so it is also called water hammer two blade one. When water hammer occurs, the impact force on the elbow section of the conduitline 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 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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