METHOD OF FABRICATION OF METAL HOSE FOR UNDER WATER COMMUNICATIONS Russian patent published in 2009 - IPC F16L11/15 

FIELD: machine building.

SUBSTANCE: invention refers to production of flexible metal hoses. According to the method first a set of parts is prepared; the set is composed out of not upset or partially upset by length and transverse corrugated chamber with flat end, of wire braiding, of bearing sleeves and of external rings and cartridges. Further the hose is assembled, in the process of which the flat ends of the corrugated chamber are arranged coaxially between the external end and the bearing sleeve and connected between them by contact seam welding. The corrugated chamber is covered from outside with wire braiding. The ends of braiding are arranged coaxially between the external cartridge and the bearing sleeve and welded to each other. The feature of the method is the following: before assembly the corrugated chamber taken from the prepared set is subject to complete upset by length, while coating the corrugated chamber with braiding, coaxial arrangement of its ends between the external cartridge and the bearing sleeve, and connecting ends by welding is performed while the corrugated chamber is compacted with axial force value of which is determined out of expression: where: H is maximal depth of hose submersion during operation, m, γ is density of water, g/cm³; D_y is internal diametre of the corrugated chamber, cm, h is height of corrugation profile, cm.

EFFECT: increased life of metal hose under condition of under water operation.

5 dwg