For natural gas the nominal BTU/cf varies from about 900 to 1100 BTU/cf. In general it is common to set
The specific gravity of natural gas varies from 0.55 to 1.0. Typical values are in the range 0.6 - 0.7.
The downstream pressure in a houseline after the meter/regulator is in general in the range of 7 to 11 inches Water Column, or about 1/4 psi.
The capacity of a 100 ft natural gas pipe with a nominal diameter 0.5 inches (actual ID 0.622 in) and 0.5 inches WC pressure drop can be calculated as
k = [((0.622 in))5/(1 + 3.6 / (0.622 in) + 0.03 (0.622 in))]1/2
q = 3550 0.117 ((0.5 in) / ((100 ft) 0.60) )1/2
= 37.9 (cfh)
Specific gravity of natural gas is set to 0.60.
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Air, LNG, LPG and other common gas properties, pipeline capacities, sizing of relief valves.
An introduction to density, specific weight and specific gravity.
Materials approved for gas pipes.
Sizing gas pipes for apartment service lines.
Carrying capacity of house gas pipes - in imperial and metric units.
Types of natural gas meters and their capacities.
Multiple apartments and natural gas demand.
Natural gas consumption in laboratory outlets.
Sizing low pressure natural gas pipe lines - Imperial units.
Sizing low pressure natural gas pipe lines - Metric units.
Capacity of natural gas orifices.
Relative capacity between larger and smaller pipes.
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