Testing, maintenance and failure analysis
Technical reference and selection guides on testing, maintenance and failure analysis.
15 guides
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How to read a hydrostatic test report
A hydrostatic test report must link the result to a specific hose assembly and a defined test method. The statement ‘tested’ alone is not a sufficient technical explanation, because it does not show the test conditions,…
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Determining test pressure and hold time
Test pressure and hold time are not determined by a single factor picked from the internet. They are defined by an authorized technical person after reviewing together the applicable edition of the relevant product and …
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Defects to record during visual inspection
Visual inspection is a systematic check covering the hose body, connections, markings and routing. The absence of a visible leak is not proof of acceptability on its own; the type of damage and the service conditions of…
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The difference between a leak test and a burst test
A leak check, a proof test and a burst test are not performed for the same purpose. While one evaluates tightness or behavior under a defined load, the burst test is a destructive evaluation aimed at the strength limit …
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Calibration certificates and measurement traceability
Calibration helps to understand the reference chain on which a measurement result is based and its uncertainty. A label on the instrument does not, on its own, show that the test result is accurate enough for its purpos…
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Hose maintenance plan and traceability record
A hose maintenance plan starts with a record that identifies each hose assembly. Location of use, service conditions, inspections and replacement decisions must be tracked together. A universal maintenance plan that app…
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Checklist for storing hoses
Hose storage must be arranged to protect the product from contamination, deformation, environmental effects and incorrect identification. Storage conditions vary by material family; the manufacturer's storage and handli…
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Distinguishing shelf life from service life in hoses
Shelf life relates to the product being kept in storage, while service life relates to the exposures and loads during use. Production date, assembly date and commissioning date must not be used interchangeably; there is…
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Building a critical hose inventory
A critical hose inventory shows which assembly is used where and what consequences its failure could have. Unlike a product list, it holds the physical assembly identification, application conditions, inspection history…
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Storage and rotation of spare hoses
Spare hose management is not just about stock quantity. It aims to ensure that the correct assembly revision is available, stored under suitable conditions and ready for use. Rotation decisions must take into account pr…
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Root cause investigation form for hose failures
Root cause analysis of a hose failure investigates use, assembly, material and operating conditions together, rather than simply labeling the damage as a product defect. The final point of rupture may not be where the f…
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Kinking or puncture at the base of the fitting
Damage occurring near the fitting requires an examination of the movement and load transfer at the hose's connection exit. Insufficient straight section, torsion, tension, vibration or incorrect routing are among the po…
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Outer surface abrasion and protection
External abrasion can result from the hose rubbing against another surface or from environmental contact. An abrasion-resistant sleeve can reduce the risk; however, it does not eliminate incorrect routing, improper supp…
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Separation, swelling and cracking of the inner layer
Swelling, layer separation and cracking are different signs of damage. Chemical attack, temperature, aging or mechanical stress must be investigated; a single cause or a safe remaining life cannot be determined from ext…
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Non-hose causes of recurring leaks
With a recurring leak, the loads on the system and the compatibility of the connection must be investigated instead of simply retightening the fitting. Pressure surges, vibration, line stress, contamination or the wrong…
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