What environmental factors should be noted for metal hoses?
The following five main factors affect the quality of metal hose, let huanzhong to tell you . 1、Corrosion Metal hose material is generally stainless steel, the presence of active anions in the medium, easy to destroy the stainless steel passivation film, small corrosion holes in the metal at the base, which is the active center of pitting corrosion generation. Etching hole in the metal surface potential is more negative, etching hole outside the metal surface potential is more positive, so the hole and outside the hole constitutes an active a blunt state micro-electro-couple corrosion battery, the battery has a large cathode small anode area than the structure, the anode current density is very large, etching hole deepen very quickly. 2、Temperature Metal hose used at high temperatures, according to the working pressure temperature correction factor of metal hose at high temperatures, reduce its rated working pressure, to ensure that the use of safe conditions. 3、Fatigue failure In the dynamic working condition, metal hose by the cyclic load often fatigue crack damage. This kind of damage is normal failure. In order to extend the service life should ensure that the hose design selection is correct, the installation is accurate and does not make the hose twist and other additional stress. 4、Water strike phenomenon Water strike phenomenon is due to a sudden change in the state of media flow, the pressure transient process generated by the change in fluid momentum in the tube, is a special oscillation phenomenon caused by the unstable flow in the tube. The sharp rise and fall of the pressure wave through the pipeline will produce a noise as if with a hammer when the pipeline is struck. When the water strike occurs, the impact on the bend section of the pipe is even stronger. Therefore, users should follow the requirements of the operating procedures, such as slow heating, smooth pressurization, reduce the amount of instantaneous flow and pressure changes to avoid the phenomenon of water shock. 5、Conveying medium If the medium conveyed in the hose is acidic or alkaline, prone to electrochemical reactions, the material of each part of the hose should be reasonably selected according to the table of corrosion-resistant performance parameters of the hose material.
