Precision Hose & Expansion Joints’ corrugated metal hose is designed to provide the longest lasting service life when properly installed. Improper installation, or movements that exceed the design capabilities of the hose, as well as careless handling of the assembly, will all reduce the useful service life of the hose and possibly cause premature failure to the hose assembly. The following handling and installation procedures should be used to achieve the best service life from your corrugated metal hose assembly.
Avoid over bending.
Repetitive bending of a hose to a smaller radius than the radius listed in the product specification tables for corrugated hose can cause premature hose failure. Make sure to provide sufficient length, which will prevent over bending and reduce strain on the hose.
In-plane lateral offset installation.
Prevent out-of-plane flexing in an installation. Make sure to always install the hose so that flexing takes place only in one plane. This plane must be the plane in which the bending occurs.
Provide support.
Provide support for the arms when installing the assembly in a horizontal loop. This will stop the hose from sagging.
Do not extend or compress axially.
Piping systems that utilize metal hoses to absorb movement must be properly anchored and/or guided. Ensure you are supporting the piping to prevent the excessive weight from compressing the hose and then relaxing braid tension.
Avoid torque.
Do not twist the hose assembly during installation when aligning the bolt holes in a flange or in making up pipe threads. The utilization of floating flanges or pipe unions will minimize this condition. It is recommended that two wrenches be used in making the union connection; one to prevent the hose from twisting and the other to tighten the coupling.
Avoid sharp bends.
Utilize sound configurations that avoid sharp bends in the hose assembly, especially near the end fittings of the assembly.
Handle with care during hose installation.
Avoid careless handling of the hose assembly. Always lift or carry metal hose to prevent abrasion damage particularly to braided corrugated hose. Store metal hose assemblies in protected areas where it would not be subjected to spillage, corrosive fumes, weld splatter, and general damage, etc.
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