CAPCO
FEL-3 Gas Hydraulics & Line Sizing Engine — Compressible Flow Systems
FEL-3 / AACE CLASS 3
GAS / COMPRESSIBLE
Pipe Specification
Pipe schedule
Sch 40
Sch 80
Sch 10
XS
Nominal diameter (NPS)
2"
3"
4"
6"
8"
10"
12"
16"
20"
24"
Pipe material / roughness
Carbon steel — commercial (0.046 mm)
Stainless steel — drawn (0.0015 mm)
Galvanized steel (0.15 mm)
API 5L line pipe (0.026 mm)
Flow Correlation
General Flow Eq.
Weymouth
Panhandle B
General Flow Equation with Colebrook-White friction factor. Rigorous for all Re. Preferred for plant piping and short-medium pipelines.
Weymouth equation — assumes fully turbulent flow (f ∝ D⁻¹/³). Conservative for large-diameter high-flow transmission lines. Overestimates ΔP at lower flow.
Panhandle B — empirical, calibrated for long-distance interstate gas pipelines. Efficiency factor E defaults to 0.92 (clean pipe). Less accurate for plant or short lines.
API 14E Erosional Velocity Check
C=100 (continuous), C=125 (intermittent), C=150–200 (solids-free)
▶ RUN GAS HYDRAULICS
Flow Regime & Mach Check
—
Re = —
Laminar Transitional Turbulent
Mach number
Ma = —
0
0.3 (design limit)
1.0
Pressure Drop & Line Sizing Results
Key Outputs
Actual velocity (avg)
—
m/s
Vel / Ve ratio
—
— (limit ≤ 1.0)
Outlet pressure calc.
—
barg
Friction factor (f)
—
Darcy
Compressor Sizing Summary
Compression ratio (r)
—
P₂/P₁ abs
Driver power (installed)
—
kW
Spec driver size
—
kW (std frame)
Diameter Sensitivity — Optimal Line Size Selection
NPS ID (mm) Vel (m/s) Ve (m/s)
V/Ve Ma Re f
ΔP fric (bar) Driver (kW) Status
CapCo Engineering Platform — FEL-3 Gas Hydraulics & Line Sizing Engine v1.0
AACE Class 3 | Compressible Flow | General Flow Eq. / Weymouth / Panhandle B