Elgenedy,
Copying the work of somebody else and presenting it as your own is grossly unfair. Your spreadsheet is >90% of the copy of "Panhandle A & B" single phase gas pipeline flow spreadsheet prepared by Samir Khan at his website "Excel Calculations". The 10% that is not identical is that your spreadsheet provides calculation only for "Panhandle A" and not for "Panhandle B" and which you fail to mention in your spreadsheet.
In fact Panhandle B is the more frequently adopted flow correlation for long-distance single phase gas pipelines compared to Panahandle A. Panhandle B provides better accuracy compared to Panahandle A for large diameter / long-distance pipelines and specifically when the Reynolds number value is greater than 10 million.
Those who want to see the spreadsheet of Samir Khan can refer to the link below and infer what I am trying to say:
http://excelcalculat...or-natural.html
Regards,
Ankur.