I wouldn't know how to calculate that, but I'm sure there are figures available for the respective pipes, but probably this might give you a lead how you could figure out how much will be flowing through the pipes in a minute, take a bucket, fill it with water, take two straight pieces of uneven length and two knees screw'em together in an U shape, place bucket on table, dip shorter end of U into the bucket, get a bucket (maybe with markings for volume on the inside) under the longer end of the U, suck on the longer end of the pipe until the water flows, stop the time it takes to get a gallon or litre through, divide 60 with measured time, multiply result with amount of water. tada flow rate with 1 bar...
I hope that helps.
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