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Can someone explain how choked pressure was calculated here? I don't understand how they just chose to add 101.3 kPa. Thank you!

4-31. Calculate the number of kilograms per year of ideal gas that can be transported through the following pipe sizes, assumStep 3 of 17 A The gauge pressure in the pipe is 689 kPa. Calculate the absolute choked pressure. Pchoked = (689+101.3)kPa =

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