1. The bending radius is too small
In the actual installation process, due to the limited installation space of the hose, when the length of the selected hose does not match the size of the installation space, for example, the nominal size is DN150, the length of the rigid section of the test piece is 100 mm, and the longitudinal offset is 250 mm, The installation minimum bending radius is 1800 mm, and the theoretical calculation minimum specimen length is 7 525 mm, but the actual length is 10 000 mm. When the length is too large than the theoretical calculation length, due to limited space, part of the hose will be excessively bent, and then It causes deformation of the outer pressure-bearing part mesh and bulge.
2. The net sleeve is too loose
In the working state of the metal hose, the transverse load in the internal pressure caused by the medium is mainly borne by the corrugated pipe, and the outer mesh sleeve mainly bears the longitudinal load. Since the net sleeves are mostly woven by machines, when the net sleeves are woven too loosely and cannot bear the pressure of the longitudinal load, the net sleeve bulge phenomenon will occur.
3. The braid angle is too large
If the weaving angle is too large during the braiding process, the coverage of the mesh sleeve will be too large, the mesh sleeve will be loose, and the mesh sleeve and the corrugated tube will not fit tightly. When the corrugated tube is deformed, it is prone to bulge.