Advanced Gas Splitter Input Form
Enter gas loads, diversity, branch lengths, fitting allowance, and pipe diameter. The calculator estimates flow split and pressure loss.
Formula Used
Adjusted Load: Connected Load × Diversity Factor
Flow CFH: Adjusted Load ÷ Gas Heating Value
Design Flow: Flow CFH × (1 + Safety Factor)
Velocity: Flow ft³/s ÷ Pipe Area ft²
Estimated Pressure Drop: f × (L ÷ D) × (ρ × V² ÷ 2gc), converted to inches of water column.
Remaining Pressure: Supply Pressure − Estimated Pressure Drop
How to Use This Calculator
- Enter the gas heating value from your supplier or project standard.
- Add supply pressure, minimum outlet pressure, and allowable pressure drop.
- Enter each appliance or branch load in BTU per hour.
- Adjust the diversity factor when all branches may not run together.
- Add straight pipe length and equivalent fitting length.
- Enter internal pipe diameter, not nominal trade size.
- Submit the form and review split percentage, velocity, and pressure drop.
- Export CSV or PDF for records, site discussions, and project checking.
Example Data Table
| Branch | Load BTU/h | Diversity % | Run ft | Fittings ft | Diameter in |
|---|---|---|---|---|---|
| Kitchen Range | 65,000 | 100 | 35 | 8 | 0.622 |
| Water Heater | 40,000 | 100 | 45 | 10 | 0.622 |
| Furnace | 90,000 | 100 | 55 | 12 | 0.824 |
| Outdoor Grill | 50,000 | 80 | 65 | 15 | 0.824 |
Gas Splitter Planning Guide
Why Gas Splitting Matters
A gas splitter layout divides one supply into several branches. Each branch may feed an appliance, room, area, or future connection. Good planning helps the system deliver enough fuel when demand is high. It also helps reduce pressure problems at the farthest outlets. A small branch can fail if the pipe is too long or too narrow.
What the Calculator Checks
This calculator compares connected gas load, diversity, flow, pipe size, run length, and fitting allowance. It converts BTU demand into cubic feet per hour. Then it adds the chosen safety factor. The tool estimates velocity and pressure drop for every branch. It also shows each branch share of total design flow.
Using Diversity Carefully
Diversity can make a design more realistic. Some appliances rarely run at full load together. A future stub may also need a lower planning factor. Yet diversity should be used with care. Critical equipment may need full demand. Local rules may also require connected load without reduction.
Pipe Size and Pressure
Pipe diameter has a strong effect on pressure loss. A small diameter raises velocity. Higher velocity usually increases loss. Long runs and many fittings also add resistance. The remaining pressure should stay above the required outlet pressure. If a branch shows review, increase pipe size, shorten the path, reduce fittings, or verify the load.
Field Use
Use the exported report during early estimating, layout review, and coordination. Compare the results with approved sizing tables. Check material type, elevation effects, regulator data, and code limits. Final installation should be reviewed by a qualified gas professional.
Frequently Asked Questions
1. What is a gas splitter calculator?
It estimates how gas demand divides across branch lines. It also checks design flow, pressure drop, remaining pressure, and branch status for planning.
2. What does CFH mean?
CFH means cubic feet per hour. It shows the approximate gas volume needed to serve the adjusted appliance or branch load.
3. Why is gas heating value important?
Heating value converts BTU demand into gas volume. A higher heating value means less gas volume is needed for the same load.
4. What is equivalent fitting length?
Equivalent fitting length adds resistance from elbows, tees, valves, and connectors. It helps represent fittings as extra straight pipe length.
5. What does diversity factor do?
Diversity reduces the connected load when equipment is unlikely to run together. Use it only when codes and project rules allow it.
6. Why does a branch show review?
A branch shows review when pressure drop is too high or remaining pressure is too low. Larger pipe may be needed.
7. Can this replace code sizing tables?
No. It is a planning calculator. Always compare results with local codes, approved gas tables, and professional design requirements.
8. What pipe diameter should I enter?
Enter internal diameter in inches. Internal diameter is different from nominal pipe size and can change by material and schedule.