Calculation and reference tools
Calculation and reference tools: scope, limits of use and technical checkpoints.
5 guides
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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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