Hose length and motion envelope on moving equipment

Technical explanation

A short assembly can cause tension or a sharp bend; an excessively long assembly can cause rubbing, sagging or snagging. In a moving application, the initial position alone is not sufficient. The manufacturer's length change and dynamic service conditions must be taken into account. Cut length and completed assembly length are different; the effective length contribution of the fittings is calculated separately. For this reason, the correct length cannot be found in all applications by adding a universal percentage.

Source: S017, S024, S031

Topic-specific checkpoints

Source: S017, S024, S031

How to evaluate it in practice

Add the fully open, fully closed and critical intermediate positions to the routing drawing. Define the sealing or reference surfaces of the A/B ends. Mark hot surfaces, sharp edges and moving parts along the route. Check the manufacturer's radius on the drawing at true scale. If a sample is needed, carry out a safe motion check before final series production. Fix the accepted length and end orientation with a revision-controlled drawing; do not pass the field copy to the workshop as a verbal dimension.

Original editorial recommendation; not a clause of a standard.

Frequently asked questions

Can I add the same percentage allowance to every hose?

A general percentage is not suitable for all applications. Manufacturer and routing conditions must be used as the basis.

Source: S017, S024, S031