Metal hose individual failure cause analysis.

Metal hose armored wire mesh sleeve pull off or fracture so that the bellows outer drum failure.
The stainless steel wire mesh sleeve in the metal hose is mainly for the bellows to play a protective role and bear the role of the medium pressure (mainly axial force) in the bellows. The mesh sleeve is wrapped around the outside of the bellows, and the ends are welded to the bellows and end rings and joints.
 
False welding causes the screen sleeve to pull off.
Due to the quality of welding, so that the bellows, ring and wire mesh sleeve in the trinity of the welding process caused part of the wire over-burning or end welding on. This hose into the pipeline due to uneven stress on the steel wire, under the pressure of the medium, the falsely welded steel wire first pulled off, so that the entire wire mesh set pulled off, resulting in the failure of the outer drum bellows, the danger. In order to prevent the occurrence of this situation, should improve the quality of welding, metal hose factory should be water pressure and gas-tight test assessment before leaving the factory, after passing.
 
Improper installation, resulting in wire mesh pull off.
Hose in the installation process, due to improper installation, or bear the pressure is too high, the hose will be subject to stretching and twisting, when the stretching or twisting stress exceeds the strength of the hose wire mesh sleeve, will make the hose three one welding parts of the mesh sleeve or other parts of the mesh sleeve pull off, and then the bellows outer drum stretching damage, causing media leakage, this should require accurate design and selection, the installation is correct.