Motion | Flexible Braided Hoses
Most industrial applications can be reduced to one of five classes of motion: 1) Angular; 2) Axial; 3) Off set; 4) Radial; or 5) Random.
1. Angular Motion Motion that occurs when one end of a hose assembly is deflected in a simple bend with the ends not remaining parallel. Angular motion may be incorporated in an installation to accommodate misalignment and vibration only, but must not be used to accommodate expansion that would result in unloading the braid .
E
L
R
Angular Motion
R 180
L =
L = Live Length (inches) R = C L Bend Radius (inches) E = Angle of Bend (degrees) = 3.1416
2. Axial Motion This type of motion occurs when one end of a hose assembly is deflected along its longitudinal axis (compressed or extended). Axial motion is applicable to annular corrugated, unbraided flexible hose only (See 8782A expansion joints). Neither braided hose nor helical hose like the 8773 (or 8777 flexible nipples) should be used in axial motion applications (compressed or extended). 3. Offset Motion Motion that occurs when one end of the hose assembly is deflected in a plane perpendicular to the longitudinal axis with the end remaining parallel. Offset is measured in inches of displacement of the free end center line from the fixed end center line. In offset motion applications, the offset should never be greater than one-fourth (25%) of the minimum center line bend radius.
R
Y
TAN
Offset Motion
L
L 2
L = √ 6YR + Y 2 L 2 = √ L 2 + Y 2 L M = √ 9R 2 + L 2 + 3R
R
L = Hose Live Length (inches) L 2 = Projected Linear Length at Offset (inches)
R = C L Bend Radius (inches) Y = C L Offset, Motion (inches) Y M = C L Maximum Offset for a given L and R (inches) NOTE: Where offset motion "Y" occurs both sides of C L , the hose live length should be based on total travel or 2 times Y.
Bulletin 8773 Page 9
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