Inputs
Example Data Table
| Pipe ID (in) | Adj. Length (ft) | Inlet (psig) | Outlet (psig) | SG | Temp (°F) | Capacity (SCFH) | Energy (BTU/hr) |
|---|---|---|---|---|---|---|---|
| 1.00 | 110.00 | 2.0 | 0.5 | 0.60 | 60 | 15 | 14,896 |
| 1.25 | 150.00 | 2.0 | 0.5 | 0.60 | 60 | Try with form | Download after run |
| 0.75 | 80.00 | 1.0 | 0.3 | 0.60 | 60 | Try with form | Download after run |
Example row uses: E=0.92, fittings allowance 10%, heating value 1,000 BTU/scf.
Formula Used
This uses a Weymouth-style estimate for standard flow when pressure drop is known.
Q ≈ 433.5 · E · D2.667 · √((P1² − P2²) / (SG · T · L))
- D in inches, L in feet (with fittings allowance).
- P1, P2 are absolute pressures (psia = psig + 14.7).
- T in Rankine (°F + 459.67), SG relative to air.
How to Use This Calculator
- Enter inside diameter and base run length.
- Add a fittings allowance to approximate equivalent length.
- Enter inlet and outlet pressures for the segment.
- Set gas properties, then click Calculate.
- Download CSV or PDF for documentation.