Industry information

Metal hoses are not far from being scrapped once these six conditions occur

2019-11-05 09:38:19 7

There is no doubt that stainless steel metal hoses have high corrosion resistance and long service life, but in the long-term use, due to problems in the product itself and in use, stainless steel metal hoses will reach the scrapping standards in advance. Scrapped products, today's stainless steel metal hose manufacturers summarize the situation:


1, the weld cracked. The flexible corrugated pipe section in the stainless steel metal hose mainly adopts the longitudinal seam welded pipe. Frequently due to the quality defects of the longitudinal seam welding itself, the strength of the pipe is insufficient to cause cracking at the weld. This kind of damage is a problem of the quality of the longitudinal weld of the bellows, so the control of the quality of the weld should be strengthened.


2, the pressure is not enough to cause blasting. Due to the pressure of the conveying medium, the temperature is too high, and the bellows has insufficient pressure resistance to cause a detonation. All kinds of damage and damage design selection errors, should be selected in strict accordance with the hose design selection criteria, determine the bellows parameters and net sets parameters.


3, fatigue damage. In the dynamic working state, the metal hose is subjected to cyclic distortion and fatigue cracking often occurs. In order to extend the service life, the hose design should be selected correctly.


4, stainless steel metal hose wire mesh pull off. Due to the quality of the welding caused by the virtual welding, the hose, the ring and the wire mesh sleeve cause the partial welding of the steel wire (over-burning) or the final welding in the process of welding in the trinity.


5, the wire mesh is broken. During the installation process, the hose will be stretched and twisted due to improper installation or excessive pressure. When the stress caused by stretching or twisting exceeds the ultimate strength of the hose wire mesh, the softness is reduced. The net sleeve of the three-in-one welded part or the net sleeve of other parts is broken. The slender tube causes the outer drum of the hose to be stretched and damaged, causing the medium to leak. The displacement should be designed and selected accurately, and the installation is correct.


6, stainless steel metal hose joints (internal connection parts) welding quality defects, resulting in hose seal failure. When the hose body is welded to the hose joint, when it is not properly operated, welding defects may occur, and these defects are difficult to find during the pressure test. When the metal hose is connected to the medium conduit, the defect may be cracked or broken due to fatigue or the like after a long period of use, and finally the medium of the conveying pipeline leaks.


According to these possible situations, it can also help you find the cause of the failure of the stainless steel metal hose, so as to solve the problem from the source, so that the stainless steel metal hose reaches the original additive.