Hose Assemblies
Measuring
Assembly Lengths
Each assembly is measured according to the type and
angle of the coupling. Assemblies with straight couplings are
measured from extreme end to end.
For assemblies that have flanged couplings, the measurement is taken to the centerline of the sealing surface.
Bent tube ends and flange head couplings can be oriented at different angles to one another and must be specified when ordering. Per the above illustration, the orientation angle is measured with the first coupling pointing downward and looking at the assembly from the second coupling. The angle between the two is measured clockwise.
On assemblies that contain OFT style (O-ring face seal) couplings, the overall measurement is taken from flange end to flange end. The measurement is taken with the nut pulled back to expose the flange end (see illustration below).
Correct Assembly Installation
Satisfactory performance and appearance depend upon proper hose installation. Excessive length destroys the trim appearance of an installation and adds to the cost of equipment. Hose assemblies of insufficient length to permit adequate flexing, expansion or contraction will cause poor transmission power and shorten the life of the hose.
The diagrams below offer suggestions for proper hose installation to obtain the maximum in performance and economy.
Since hose may change in length from +2% to -4% under the surge of high pressure, provide sufficient slack for expansion and contraction.
Avoid sharp twist or bend in hose by using proper angle adapters. Where the radius falls below the required minimum, an angle adapter should be used as shown below to avoid sharp bends in hose.
