Common symptoms and solutions for hose assembly failures:

• Expired service life
• Improper hose insertion depth
• Fitting crimp diameter not within required dimensions
• Insertion tube damaged during assembly (field attachable fittings)
• Hose twisted (application routing)
• Hose abrasion

• Hose minimum bend radius exceeded
• Fluid incompatibility
• Hose is kinked or crushed
• Dry air aged
• Excessively high/cold temperatures
• Excessive pressures
• Improper use

HOSE MINIMUM BEND RADIUS

SYMPTOM: Hose bursts at outside bend of hose. Has taken a set (usually oval) and remains in bent position yet remains flexible. Possibly some broken wires in area of failure on outside bend of hose. If application is a vacuum or suction, the hose may tend to be flattened out in bend area, which may hinder or restrict the flow. If bend is severe enough, the hose may exhibit a kink.

CAUSE: Violation of the recommended minimum bend radius or starting bend right at the fitting.

SOLUTION: Replace hose assembly. Re-route hose assembly to increase bend radius according to the requirement. The hose should not begin to bend for a minimum distance of two times the inside diameter of the hose then stay within minimum bend requirements. Use the proper clamps as required.

• Minimum Bend Radius is the smallest radius that a hose can be routed in service.
• When determining the bend radius of the application also consider movement, operational changes and flexing.
• General rule: The hose should run straight out of the fitting shell for a distance at least two times its inside diameter before it begins to bend.