API RP 14E Erosional Velocity Calculator
Enter the selected empirical C factor and flowing gas-liquid mixture density. The calculator returns the API RP 14E screening velocity in ft/s; document how both inputs were established.
Calculation context and source notes
The API RP 14E erosional velocity equation divides an empirical C factor by the square root of flowing mixture density to produce a screening velocity for gas-liquid production piping.
Use the result as one screening check within the scope of API RP 14E and the applicable design basis. Published reviews emphasize that the simple C-factor relationship does not represent all erosion, corrosion, solids, geometry, materials, or flow-regime mechanisms.
Solves for
V_e (ft/s)
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Formula, variables, and sourceRelated source-backed guides
Formula, variables, and default calculation
Reproducible default result
With the default values shown below, the calculation returns V_e = 28.523024 ft/s. Defaults demonstrate the implementation; they are not recommended field values.
100
12.29161306450595
Input definitions
C
empiricalAPI RP 14E Empirical C Factor
rho_m
lb/ft3Gas-Liquid Mixture Density
Output definitions
V_e
Erosional Velocity
C
API RP 14E Empirical C Factor
rho_m
Gas-Liquid Mixture Density
Engineering use, assumptions, and limits
Use the result as one screening check within the scope of API RP 14E and the applicable design basis. Published reviews emphasize that the simple C-factor relationship does not represent all erosion, corrosion, solids, geometry, materials, or flow-regime mechanisms.
Assumptions
- Mixture density represents the flowing gas-liquid stream at the pressure and temperature being checked.
- The selected C factor is justified for the service, operating mode, and design practice.
- The equation is being used as a screening criterion rather than a complete erosion model.
Limitations
- Does not directly account for entrained solids, corrosion chemistry, droplet or particle impact, elbows, welds, material resistance, or flow regime.
- A velocity below the screening value does not by itself demonstrate integrity or acceptable erosion-corrosion risk.
Common mistakes
- Using gas density or liquid density alone instead of representative mixture density.
- Choosing C=100 or another common value without documenting service-specific justification.
- Treating the calculated velocity as a universal code limit.
Frequently asked questions
What inputs does the API RP 14E Erosional Velocity calculator need?
The calculation uses API RP 14E Empirical C Factor (C), Gas-Liquid Mixture Density (rho_m). Enter values on the units shown beside each field.
What result does this calculator return?
The primary result is erosional velocity in ft/s. The formula section shows the declared relationship, variables, and a reproducible default calculation.
What should I check before using the result?
Confirm the unit basis, source applicability, and input quality. Does not directly account for entrained solids, corrosion chemistry, droplet or particle impact, elbows, welds, material resistance, or flow regime. Using gas density or liquid density alone instead of representative mixture density.
Source and record status
Source metadata identifies the relationship implemented by the calculator. Check the cited edition, unit basis, and scope against the engineering case before operational use.
Review of the API RP 14E erosional velocity equation, Eq. 1 and listed API C-factor guidance.
Open source reference