Natural Gas Pressure Drop Calculations

Hi
I'm running a natural gas pipe sizing calculation. The pressure drop cannot exceed 1mbar. I have generated the results.

From the first sheet, in the Pressure drop columns, there a multiple pressure drops. 

To check if the drop is within 1mbar, should i only consider the drops along the longest run?

I need some guidance on how to check if system pressure drop is within 1mbar from the available list of drops (section-wise).

I will be grateful for an early reply.

Thank you.

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