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Bore Step Calculator
Compare DN2, DN3 and DN4 on the three things bore actually decides: flow area, the volume the line has to fill before the gauge reads, and how hard the bore resists flow.
Choose a bore and length, then compare.
| Bore | Flow area | Fill volume per metre | Fill volume at your length | Relative flow at equal pressure drop |
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Model: flow area is the circle area of the nominal inside diameter; the resistance comparison uses the fourth-power relation for laminar flow of an incompressible fluid, with length, viscosity and pressure difference otherwise unchanged. A diagnostic hose is a dead-ended sensing line, so treat the resistance column as a comparison between bores and the fill-volume column as what governs settling time. Working and burst pressure are properties of the construction, not of the bore, and are confirmed on your drawing.
