Knowledge Center
From selection to assembly, from standards to maintenance: sourced technical guides on hose and connection technology.
215 guides
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How to read a hose standard and check its edition
A standard number alone is not enough: the edition, the scope and any amendments must be checked. A publicly available summary of a standard does not replace the full technical requirements. Product conformity must also…
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Navigating between SAE, EN and ISO codes
SAE, EN and ISO references belong to different standards systems. The fact that they describe a similar hose construction does not mean that all dimensional, test and performance conditions are equivalent; comparison mu…
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The difference between a product standard and a test standard
A product standard addresses which product and performance framework is being discussed; a test standard addresses how a specific property is to be measured. The presence of a test method number in a report does not, on…
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Distinguishing standard scope from application suitability
A product that falls within the scope of a standard and a product whose conformity to the standard has been verified are not the same thing. The scope says which subject the document addresses; conformity requires evide…
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How to handle catalogs that cite outdated standards
When an outdated standard reference is found, the status of the document and any superseding edition are investigated first. Publication of a new edition does not automatically make an older product unsafe or compliant …
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Technical documents to request with a hose assembly
The delivery file of a hose assembly must show the identity of the ordered product and the requested checks in a traceable way. The scope of the file is determined by the application and the contract; it is not correct …
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Distinguishing an inspection document from a declaration of conformity
An inspection document, a test report and a declaration of conformity can be issued for different purposes. Who issued it, what it covers and which product it is linked to matter as much as the name of the document; one…
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Distinguishing material documents from finished product performance
A material certificate provides information on the material properties of a part; on its own, it does not show the pressure, sealing or cyclic performance of the completed hose assembly. Material correctness and assembl…
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How to record the scope of a manufacturer approval letter
A manufacturer approval must be based on an explicit document showing that a specific product or combination has been evaluated for specific conditions. A general catalog statement, a sales conversation or data for a pr…
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Revision and change management in the technical file
Revision management makes it possible to track a changed product or piece of information without deleting the previous record. When the hose, fitting, material, assembly method or service condition changes, it must not …
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Regulatory research path for food contact suitability
Food contact research starts by determining the country where the product will be used and the contact conditions. The material name or the term ‘food grade’ alone is not sufficient; the applicable legislation, the prod…
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Expert review questions on pressure equipment scope
How a hose or hose assembly is to be evaluated under the PED is determined by the role of the product, the design conditions and the scope of the relevant regulation. Statements such as ‘it operates under pressure’ or ‘…
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Separating ATEX claims from the electrical properties of hoses
Electrical conductivity and ATEX conformity are not the same concept. A hose being described as antistatic does not automatically show that the entire assembly is suitable for every use in an explosive atmosphere or tha…
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Scope of REACH and RoHS declarations
REACH and RoHS requests are based on different regulations; they are not interchangeable general quality certificates. The information to be requested from the supplier must be defined according to the product's composi…
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Country and application scope of drinking water conformity documents
In a drinking water application, conformity is evaluated according to the target country, the product's components in contact with water and the scope of the relevant document. A food contact declaration or a color or o…
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A hose inventory approach for refinery maintenance
A refinery hose inventory must track fluid hazards and operating conditions together with the physical assembly identification. The same stock code can carry different risks in different units; selection and maintenance…
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Hose selection questions for shipyards and marine applications
In shipyard and marine applications, hose selection takes into account the external environment and the facility or vessel requirements as much as the fluid conveyed. It is not assumed that every hose to be used in a ma…
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Hose management in mining and construction machinery
In mining and construction machinery, a hose is evaluated with respect to movement, impact, abrasion and contamination in addition to pressure load. A higher pressure class alone does not provide a longer service life; …
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Transfer hose checklist for food plants
Hose inspection in a food plant must cover product contact, cleanability and assembly integrity together. Seals, connections, cleaning conditions and the arrangement of use in the field are as important as the declarati…
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Hose risk classification in chemical plants
In chemical transfer, risk classification is not done by looking only at the name of the chemical. The hazards of the substance, concentration, temperature, quantity, transfer method and the possible consequences of a l…
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Hose requirements for data center liquid cooling
In data center liquid cooling, hose and connection selection addresses coolant compatibility, cleanliness, low leak risk, flow performance and the maintenance method together. It is not assumed that a general water hose…
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Fluid transfer questions in battery manufacturing
In battery manufacturing, the evaluation of a transfer line starts with the process step and the actual composition of the substance. Selecting a single ‘battery hose’ for all liquid, powder and cleaning duties in a pla…
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Expert approval for hose selection in hydrogen lines
In hydrogen applications, hose and connection selection requires a dedicated technical assessment. Gas permeation, material behavior, pressure and cycling conditions must be examined together; general knowledge about hy…
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Hose and fitting requirements in cryogenic service
In cryogenic applications, it is not enough to select an inner tube that withstands low temperatures. Connections, seals, movement, thermal change and the integrity of the assembly must be evaluated together; catalog va…
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Flexible connections in robotic and moving lines
In robotic applications, hose selection is based on the direction and number of repeated movements and on the routing. Static bend radius information alone does not show adequate performance under multi-axis motion or c…
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Inch-millimeter length converter
For length conversion between inches and millimeters, 1 inch = 25.4 mm is used. However, the inch value in a thread or pipe nominal name is not always a measurable actual diameter; unit conversion and product size match…
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Bar, MPa and psi pressure converter
bar, MPa and psi are pressure units used for the same physical quantity. Changing the unit does not change the strength of the product or the permitted working limit. The distinction between absolute pressure and gauge …
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Calculating mean flow velocity from flow rate and inside diameter
In a circular cross-section, mean flow velocity is calculated by dividing the volumetric flow rate by the actual flow cross-section: v = Q/A. This result is the mean velocity; on its own, it does not determine pressure …
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Calculating theoretical inside diameter from a target velocity
For a given flow rate and a selected mean velocity, the theoretical inside diameter is found from the relationship d = √(4Q/πv). The velocity input must be set by the person responsible for design; this tool does not by…
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Data required for a pressure loss calculation
Flow rate and nominal diameter alone are not sufficient for a pressure loss calculation. The actual inside diameter, length, fluid properties, temperature, connections and flow regime are required. A single reliable los…
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