[stavaigi]

λοιπον να σου δωσω ενα παραδειγμα
ενα ενυδρειο reef 100 λιτρων θε πρεπει το νερο του να ανακυκλονεται επι 20 φορες αρα θα πρεπει να εχει την δυνατοτητα να κατεβαζει 100*20=2000 λιτρα τι σωληνα θα χρησημοποιησω ?
υπαρχει καπιος τροπος που το υπολογιζεις? η το κανεις εμπειρικα ?
παιζει ρολο σε πιο υψος θα ειναι η τρυπα!
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Νικο τσεκαρε και αυτο το βρηκα σε ενα forum

Yep. The calculations I did come up with that figure, now keep in mind that my calculations are based on a vertical hole which technically wont drain as much as a horizontally mounted hole (simple example: a 1" hole at 1/2" depth mounted verticaly would only be half underwater yet a 1" horizontal/flat hole under even 1/4" water would be completely covered). So if you were to put a hole on the bottom side of a tank, as long as it is vertical, it will have slightly less pressure on it than a bulkhead mounted on the bottom glass because of it's height. So a bottom hole will have a slight flow gain on a side hole, but I am not going to redo my calculations because were talking a minimal gain here, considering we would be at 12" or more of depth the flow on a horizontal bulkhead is already in the hundreds. More flow can be lost with screens over the bulkheads and accumulation of crud on a bulkhead's intake, easily over 20%. That's why I would never go with a bulkhead less than 1" unless we are using it for less than 100gph, or you are sure to prefilter the water enough to prevent clogging (D, I think you will be fine as long as you put a sponge or screen in your overflow above the bulkhead to keep any chunks away).
Just short of graphing the chart with line curves I have for flow by cross referencing hole diameter with hole depth, I can post the following:
1"bulkhead @ 1" depth=338.6gph
1"bulkhead @ 1.5" depth= 414.8gph
1"bulkhead@ 2" depth=478gph
1"bulkhead@ 3" depth=586gph
1"bulkhead@ 4" depth=677gph
1"bulkhead@ 5" depth=757gph
...if you even need to know what the possible flow for a hole at a given depth is for more flow you dont have a nano anymore, and you are in the wrong forum.
3/4"bulkhead@ 1"depth=190.5gph
3/4"bulkhead@ 1.5"depth=233.3gph
3/4"bulkhead@ 2"depth=269gph
3/4"bulkhead@3"depth=329gph
3/4"bulkhead@4"depth=381gph
...you can draw the rest of the curve from there.
1.5"bulkhead, I dont think anyone needs these on a nano because 1" is enough for most tanks up to 40 gallons, and remember...a 1.5" bulkhead has more than double the intake area of a 1"...so were @ 933gph at just 1.5"deep.

απλα ρωταω αν υπαρχει καποιος τυπος που τα υπολογιζει ο τυπος
και απο οτι λεει εδω παιζει ρολο και η τρυπα και το υψος του σωληνα για να μην εχεις θορυβο υπαρχουν διαφορες τεχνικες αλλα οι υπολογισμοι αυτοι πως?