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Originally Posted by Lofus
Sorry Delphinus. The book I've been reading that describes the skimming theory is "Aquatic Systems Engineering: Devices and How They Function" by Pedro Ramon Escobal.
By 2 x 6" = 10" I was referring to a rule of thumb in standard steel piping design but I got the sizes wrong. It should read 2 x 6" = 8".
A 6" sch 40 steel pipe has an ID of 6.065 in so a cross sectional area of 28.8 sq in. Two 6" combined are 57.6 sq in. An 8" sch 40 steel pipe has an ID of 7.981 in so a cross sectional area of 50.3 sq in.
One 8" system or twinned 6" systems behave very simmilliarly. The same holds true for two 8" systems behaving like a single 10" system.
I would expect that acrylic pipe would act the same as steel more or less.
I agree that two different styles of skimmer should operate differently in parallel but two of the same style should operate like one big skimmer.
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There's been a number of people over the years that have run dual skimmers and found only one doing the work.