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Originally Posted by HSSS427
But with 2 -6 lines feeding one -10 line, then it's hard to say - would that be the equivalent of a -12 feeding a -10 and then into a -6?
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If I remember correctly, I believe the AN stands for Army-Navy , and the number is the diameter of the tube, such that you take the number / 16, and that's the diameter in inches. 2 6-AN's do not equal 1 12-AN line, the 12-AN line will flow more. Going from cross sectional area alone, I would think 2 6-AN's will flow alittle more than one 8-AN, but not as much as 1 10-AN, and definitely not as much as one 12-AN, which may be equal to about 4 6-AN lines.
My guess is that since cross sectional area is a function of radius (diameter) squared, you square the number to get the relative cross sectional area, so a 6-AN line would have a relative area of 36, 8-AN would have 64, 10-AN would be 100, and a 12-AN would be 144.