Very Large Display Tank, Help Appreciated

[Troy F]

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.

There's been a number of people over the years that have run dual skimmers and found only one doing the work.