Natural Gas - Pipe Sizing Calculator

Calculate the capacity of low pressure natural gas pipelines using the Spitzglass formula. Determine flow rates based on pipe diameter, pressure drop, length, and gas specific gravity.

Calculator

Inputs

Results

K Factor-- dimensionless
Gas Flow Rate-- cfh
Heat Output-- MBH
Pipe Diameter (in)Pressure Drop (in WC)Pipe Length (ft)Specific GravityFlow Rate (cfh)Heat Output (MBH)
0.50.25500.6=3550*SQRT((0.5^5)/(1+3.6/0.5+0.03*0.5))*SQRT(0.25/(50*0.60))=3550*SQRT((0.5^5)/(1+3.6/0.5+0.03*0.5))*SQRT(0.25/(50*0.60))
0.50.51000.6=3550*SQRT((0.622^5)/(1+3.6/0.622+0.03*0.622))*SQRT(0.5/(100*0.60))=3550*SQRT((0.622^5)/(1+3.6/0.622+0.03*0.622))*SQRT(0.5/(100*0.60))
0.750.51000.6=3550*SQRT((0.75^5)/(1+3.6/0.75+0.03*0.75))*SQRT(0.5/(100*0.60))=3550*SQRT((0.75^5)/(1+3.6/0.75+0.03*0.75))*SQRT(0.5/(100*0.60))
10.51000.6=3550*SQRT((1.0^5)/(1+3.6/1.0+0.03*1.0))*SQRT(0.5/(100*0.60))=3550*SQRT((1.0^5)/(1+3.6/1.0+0.03*1.0))*SQRT(0.5/(100*0.60))
1.250.51000.6=3550*SQRT((1.25^5)/(1+3.6/1.25+0.03*1.25))*SQRT(0.5/(100*0.60))=3550*SQRT((1.25^5)/(1+3.6/1.25+0.03*1.25))*SQRT(0.5/(100*0.60))