Knowledge Center
From selection to assembly, from standards to maintenance: sourced technical guides on hose and connection technology.
215 guides
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Hose-fitting compatibility and system approval
A hose and a fitting having the same nominal size does not prove that they can be safely crimped together. The hose series, fitting series and assembly data must be treated as a verified system. A brand name alone is no…
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How is crimp data verified?
Crimp data must be linked to the hose, fitting, ferrule, size, machine and manufacturer instructions. A crimp diameter taken from another brand or a similar hose does not provide safe equivalence; a verified combination…
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Defining skive and no-skive assembly
Hose preparation can differ between skive and no-skive fitting systems. Which layer is prepared, where and to what extent is taken only from the manufacturer's instructions for the relevant hose-fitting system; there is…
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Cleanliness check after hose cutting
Hose cutting and cleaning are part of the assembly; particles that get inside are not merely a cosmetic problem. The cutting method, cleaning and protection of the ends must be determined by the manufacturer's instructi…
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Post-crimp measurement and record checklist
A post-crimp record must show the actual assembly and inspection result, not just the machine setting. The hose, fitting, ferrule, instruction revision, measured values, equipment and assembly identification must be kep…
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How to interpret minimum bend radius
Minimum bend radius is the geometric limit specified for a hose under the relevant service condition. The static/dynamic distinction in the catalog and the measurement reference of the radius must be checked; the fact t…
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Torsion and tensile load on hoses
A hose must not be used as a tension member or a torsion spring. The end orientations and routing must be arranged so that no unwanted tensile or torsional load is transferred to the hose throughout the motion; minimum …
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Hose length and motion envelope on moving equipment
Hose length is not the shortest distance between two connections. It must be determined by evaluating together the end geometry, all positions of the motion, the minimum bend radius, the straight sections and the suppor…
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Straight length requirement at the fitting exit
At the fitting exit, the straight section and bending conditions required by the manufacturer must be maintained rather than forcing the hose into a sharp turn immediately. The required length depends on the product fam…
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Using hose guides, supports and protectors
Protective sleeves and supports complement correct hose routing; they do not automatically correct a wrong installation. The choice of protection must address rubbing, heat, impact and maintenance access together, and m…
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How are the A and B ends of a hose assembly defined?
Defining the A and B ends of a hose assembly separately prevents the two different connections of the same hose from being confused. For each end, the connection family, size, orientation, sealing, material and, where a…
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Distinguishing cut length from overall length
Cut length is the length of the hose body to be prepared; overall assembly length is the completed dimension between defined end references. Without knowing the fitting contributions and the measurement method, no relia…
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Designing a hose production batch record
A production batch record links the assemblies prepared under the same production conditions and the components used. Batch information does not replace individual hose identifications; it serves to show which products …
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What information should a hose label contain?
A hose label must link the physical assembly to its technical records. The identification, product or assembly designation and the necessary service information must be legible; unverified pressure, temperature or certi…
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The difference between a serial number and a batch number
Batch traceability follows a common production group, while individual serial traceability follows each physical hose. If maintenance, test and service history is specific to one hose, an individual identification is re…
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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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