Motion Frequency

The frequency of a particular class of motion to which a flexible metal hose may be subjected by repeated flexing or bending. The frequency of motion may be divided into three basic categories: namely vibration, intermittent, and continuous. The minimum live length required for these notion categories may be selected as follows:

1. Vibration:

For the normal vibration encountered in industrial applications, such as pump and compressor discharge lines and engine exhaust installations, the hose live lengths should be taken from the Minimum Live Length For Vibration column on Technical Data Pages. Normal vibration is shown as the unshaded area of the chart below. If the expected combination of double amplitude (total motion excursion) and frequency falls into the shaded area, consult Senior Flexonics Engineering. Caution: Avoid hose resonance. If resonance is anticipated, consult Senior Flexonics Engineering.

2. Intermittent motion:

Motion that occurs on a regular or irregular cyclic basis normally the result of thermal expansion and contraction or other noncontinuous actions. The intermittent flexing bend radius shown on Hose Technical Data Pages shall be used in the formulas for angular, radial and offset motion when determining hose live length for intermittent motion.

3. Continuous motion:

Motion that occurs on a regular cyclic basis normally at a slow cyclic rate and constant travel. For Continuous Lateral Offset Motion double the minimum centerline bend radius required for Intermittent Flexing shown on Hose Technical Data Pages.

4. Static Bend:

The minimum center line bend radius to which a flexible metal hose may be bent for installation. No further motion is to be imposed other than normal vibration