Source: http://www.iapg.org.ar/WGC09/admin/archivosNew/Special%20Projects/4.%20IGU%20Best%20Practices/4.%20IGU%20Best%20Practices%20FINAL%20-%20CD%20contents/3.%20Transmission%20-%20Accurate%20calculation%20of%20pipeline%20transport%20capacity.pdf