อัปเดต 2026-09-07

Liquid pipe velocity

API RP 14E erosional limit

Converts flow rate and pipe ID into bulk velocity, classifies it against an application velocity band, and checks it against the API RP 14E erosional-velocity ceiling.

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Continuity for bulk velocity; API RP 14E's C-factor erosional criterion (scaled from the standard's US-customary ft/s, lb/ft³ basis to SI).

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Bulk velocity

v = \frac{Q}{A} = \frac{4 Q}{π D ^{2}}

Q = volumetric flow (m³/s), D = inner diameter (m)

Erosional velocity (API RP 14E §2.5)

v_{e} = 1.21990 \cdot \frac{C}{ρ}

C = 100 continuous service / 122 intermittent service; ρ = fluid density (kg/m³); 1.21990 is the ft·s→m·s unit-carry factor

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