Hose Configuration Requirement  - Hose Assemblies are usually connected at both ends in service.  They may then either remain in a fixed or static configuration or in a flexing or dynamic configuration.

When static or dynamic, the 1st Rule concerning the configuration of the hose is that the bend radius of the hose must never be less than the Minimum Bend Radius (MBR) for the hose as listed in the relevant hose brochure.

The most common situation when this is likely to occur is when the hose is flexed at the end fitting with stress being applied to the hose at an angle to the axis of the end fitting.  Typically this happens either because the length of the hose is too short, or because the weight of the hose plus contents creates a stress at an angle to the end fitting.

The 2nd Rule, therefore, if possible is to design the configuration to ensure that any flexing in the hose takes place away from the end fittings.

The 3rd Rule is that the hose configuration should always be designed, and supported where necessary, to avoid any possibility of external abrasion.

In some case, the length, configuration and angle of the hose can be designed to avoid abrasion. In others, static or moving support frames or support wheels are required.

The Fourth Rule is that the hose must not be subjected to torque, either during connection, or as a result of the flexing cycle.

Torque (twist) in the hose can be applied during connection if the hose is accidentally twisted, or if the second end being connected is a screwed connection, and the hose is subjected to torque during final tightening.

In a flexing application, if any flexing cycle of the hose occurs in 3 dimensions instead of 2, then torque will also occur.

Both Corroflon and Bioflex hose have good resistance to a small level of torque, much better resistance than rubber of SS hose types, but it is still the best practice to take whatever steps are necessary to eliminate torque. If in doubt, consult Aflex Hose.