Dimensions and markings
Dimensions and markings: scope, limits of use and technical checkpoints.
5 guides
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Why inch-to-millimeter conversion is not a nominal size match
One inch is exactly 25.4 millimeters. This length conversion is not an actual diameter match for a nominal hose size or a pipe thread. In an order, keep the numerical conversion separate from the product size definition.
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DN, dash and nominal hose sizes
DN, dash and inch expressions are not the same kind of dimension. DN is a nominal size designation; in many hose families, dash is used as a size code in sixteenths of an inch. However, the meaning of the code must be v…
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How to read the markings on a hose
The layline is the identification and property marking on the outer surface of the hose. It may include manufacturer, series, nominal size, pressure or standard information; the content varies by product family. A photo…
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Measurement references for hose length and end connections
A length order must give a start and end reference along with the number. Fitting ends, sealing surfaces, elbow axes and bare hose ends can be different references. Unless the supplier and customer use the same referenc…
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Pressure units and the gauge vs. absolute pressure distinction
bar, MPa and psi are pressure units; the terms gauge and absolute indicate the reference of the pressure. Unit conversion does not change the reference. Especially in vacuum, gas and steam assessments, it must be clear …
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