Pneumatics · Preliminary sizing

Pneumatic line: flow and pressure drop

Estimate pressure drop, outlet pressure, and allowable normalised flow for a hose and fittings.

ISO6358

Inputs

Inlet pressure (gauge; bar(g))

bar

Normalised flow (at 1.01325 bar(a), 20 °C)

Nl/min

Hose length

Inner diameter

Air temperature

°C

Roughness

µm

Local loss coefficient Σζ

–

Allowable pressure drop

bar

Results

Complete the inputs and calculate.

Model

Pressure drop is estimated with Darcy-Weisbach, a friction factor, and local losses at inlet conditions.

Scope

Results are preliminary engineering estimates. Manufacturer curves, loads, temperature, leakage, cushioning, and the complete safety and pressure-equipment assessment remain separate.

Standards

ISO 1219-1 and ISO 6358-1 provide symbols, terminology, and test-method context; ISO 4414 is used as a safety context. No standards compliance is certified.