pmrossetti
Active member
Right. so sjm is right about that and evsalty is right about the Y and the elbows, right?
so 6-7' head?
so 6-7' head?
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Internal return pump with no restart issues?
- Thread starter pmrossetti
- Start date
Let me put this in a practical light.
A friend of mine has a 180G (24" tall) on a 36" stand with a small 40B sump. He has a pretty crummy 3/4" plumbing setup with Ts and elbows. He has an Eheim 1262 and it works just fine.
To reduce head you can also use larger dia plumbing. Use 1" as much as you can and 3/4" only as necessary.
A friend of mine has a 180G (24" tall) on a 36" stand with a small 40B sump. He has a pretty crummy 3/4" plumbing setup with Ts and elbows. He has an Eheim 1262 and it works just fine.
To reduce head you can also use larger dia plumbing. Use 1" as much as you can and 3/4" only as necessary.
This is incorrect, you start at the top of the water line and it does mean exactly that. Of course the additional 10' of plumbing would cause friction.
Lets say you put an ehiem 1262 at the bottom of a 14 foot tall barrel filled with water with a tube running to the top of the water line. Turn it on and it would pump ~ 900 gph to the surface (minus head loss friction from the plumbing itself). Put a 1262 in a situation where it had 14 foot of head it would not function at all.
If you read thru the rest of the thread you will see that it was already established that I was wrong in that statement.
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coralreefdoc
New member
Pm. Teach me the method to getting mass replies to a thread question. Seems like its either feast or famine with these threads, you obviously touched a soft spot with this one lol
pmrossetti
Active member
A disagreement over head pressure was the inteeresting topic.
coralreefdoc
New member
I browsed. There's obviously mixed opinions, however, IMO/E the head pressure starts at the top of the water level in the sump. Plumbing will have a negative effect as far as friction. What I like to do is conservatively add half of the water depth of the sump as added head pressure, for what its worth.
pmrossetti
Active member
Sorry, as a married man with two teenage kids I never get a chance to be right so I got excited there and jumped the gun a bit. Lol
Midnightsun
New member
Ok, so now that we have finally established that head pressure between 2 tanks is the differance between the top of the two water levels, let's take it a little further. :eek2:.
You also need to account for outlet location in the main display. Normally this is very close to the top so it does not really matter however, some tanks are plumbed from below and if it is on a 2' deep tank, this distance must be added to the head. Think about it for a minute. A hole in the bottom of the tank will gush water, this is pressure and would act negatively on the pump as it needs to counter act this force.
When designing a system try to get head pressure to a minimum. (increasing sump height or having it sit further up in the cabinet helps) Choose a correct size pump that will be sufficient running full bore. Seems like most here double up and throttle back. This throttling only causes the excess to bypass the impeller and remain in the tank which causes additional heat not to mention why in the heck would you burn twice the wattage/power 24/7 when not required?
I have my sump in an adjoining closet. Sump is placed on a shelf which is 6" below the display therefore I have only 6" of head felt by the pump and can use a tiny one and get the same results as some of the monsters I see being used.
You also need to account for outlet location in the main display. Normally this is very close to the top so it does not really matter however, some tanks are plumbed from below and if it is on a 2' deep tank, this distance must be added to the head. Think about it for a minute. A hole in the bottom of the tank will gush water, this is pressure and would act negatively on the pump as it needs to counter act this force.
When designing a system try to get head pressure to a minimum. (increasing sump height or having it sit further up in the cabinet helps) Choose a correct size pump that will be sufficient running full bore. Seems like most here double up and throttle back. This throttling only causes the excess to bypass the impeller and remain in the tank which causes additional heat not to mention why in the heck would you burn twice the wattage/power 24/7 when not required?
I have my sump in an adjoining closet. Sump is placed on a shelf which is 6" below the display therefore I have only 6" of head felt by the pump and can use a tiny one and get the same results as some of the monsters I see being used.
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pmrossetti
Active member
Ihe hole is at the top, thru the back. It's acrylic, so the hole is at the very top.
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