GasFlow — Natural Gas Pipe Sizing Calculator

01 System Parameters

Gas type Specific gravitySG Heating valueBTU/ft³

Load entry unit CFH BTUH

02 Pipe & Pressure

Pipe material System pressure Pressure drop

Primary table is IFGC 2021 Table 402.4(2): Schedule 40 metallic pipe, natural gas, 0.60 SG, 0.5 in. w.c. pressure drop.

03 Longest Run

Longest run from meter to most remote outletft Apply 1.5× fittings factor to longest run

IFGC longest length method uses the rounded-up longest run column for every segment. Branches do not get their own shorter columns. Bureaucracy with a ruler.

04 Pipe Segments

Segment	From	To	Length	Downstream Load

05 Options

Show utilization percentages Show full pipe capacity reference

Pipe Schedule Summary

Total connected load—CFH

Rounded longest run—ft column

Largest pipe required—nominal

Segments sized—rows

Per-Segment Results

Segment	From	To	Length	Load	Size	Capacity	Utilization

Active Pipe Capacity Table