BlueLine HD Series External Pumps

"Steve "Srfmon"" wrote in message
...

I'm using it on a closed loop .........................

I built a Hang on bracket out
of 3/8" acrylic to hold it higher so there is little head pressure.



Closed loop only has the head of the restriction of the plumbing regardless
of height from the tank. the only difference you get between having it
higher up the tank as opposed to sitting on the floor is the extra friction
from the extra 3' or so of pipe, which I highly doubt you could tell any
difference from as long as it didn't have elbows in it.


kc

Are you kidding? Who gave you this info?
Head pressure is less when the height the pump has to carry the water
lessened. Regardless if it is a closed loop or whatever. That's just the way
it works. It's not easy for a pump to lift water & the higher it has to go,
the slower it is going to do it.
Just look at the box on most pumps they will give you a graph of gph at
different head pressure. Notice how the gph begins to dip the higher the
head. Elbows do impede flow you are correct about that but not as much as
head pressure.
Steve

"Dragon Slayer" wrote in message
...

"Steve "Srfmon"" wrote in message
...

I'm using it on a closed loop .........................

I built a Hang on bracket out
of 3/8" acrylic to hold it higher so there is little head pressure.



Closed loop only has the head of the restriction of the plumbing
regardless
of height from the tank. the only difference you get between having it
higher up the tank as opposed to sitting on the floor is the extra
friction
from the extra 3' or so of pipe, which I highly doubt you could tell any
difference from as long as it didn't have elbows in it.


kc

when its closed loop there is no head, the water is coming from the tank and
returning to the tank, the pump is just moving it between the input and
output.

pumps state head with open loop where they are pumping water from a sump to
your tank. when you have it closed loop it is coming and going from the
same place, no difference so no head, just the loss of the plumbing. maybe
you should do a little more research before you jump next time.

kc

"Steve "Srfmon"" wrote in message
...
Are you kidding? Who gave you this info?
Head pressure is less when the height the pump has to carry the water
lessened. Regardless if it is a closed loop or whatever. That's just the
way
it works. It's not easy for a pump to lift water & the higher it has to
go,
the slower it is going to do it.
Just look at the box on most pumps they will give you a graph of gph
at
different head pressure. Notice how the gph begins to dip the higher the
head. Elbows do impede flow you are correct about that but not as much as
head pressure.
Steve

"Dragon Slayer" wrote in message
...

"Steve "Srfmon"" wrote in message
...

I'm using it on a closed loop .........................

I built a Hang on bracket out
of 3/8" acrylic to hold it higher so there is little head pressure.



Closed loop only has the head of the restriction of the plumbing
regardless
of height from the tank. the only difference you get between having it
higher up the tank as opposed to sitting on the floor is the extra
friction
from the extra 3' or so of pipe, which I highly doubt you could tell any
difference from as long as it didn't have elbows in it.


kc

"Steve "Srfmon"" wrote in message
...
| Are you kidding? Who gave you this info?
| Head pressure is less when the height the pump has to carry the water
| lessened. Regardless if it is a closed loop or whatever.

DS is right, but only if the CL drain and return are both underwater. The
minute you raise the return above the water surface, you have head pressure.
But even then, it's only the distance from the water surface to the return
(or the top of the Upipe, for instance, that might go up and over the rim).
Head (in feet) is the distance from the water surface of the vessel the pump
draws from, to the water surface of the highest point it has to raise the
water to. In a closed loop, the water surface (think of it as "the amount of
water pushing down") is the same for the intake and output. Thus, head in
the return is cancelled out by (anti?)head in the drain. There will always
be friction loss, but not necessarily any vertical head pressure. By raising
the pump closer to the bulkheads, all that is done is to reduce the friction
loss.

Kev

You said:
"Closed loop only has the head of the restriction of the plumbing... "

Why is that- because the head pressure (weight of the water) at the
suction side of the pump equalizes the head height on the pressure
side?

hmmmm.....



"Dragon Slayer" wrote in message ...
"Steve "Srfmon"" wrote in message
...

I'm using it on a closed loop .........................

I built a Hang on bracket out
of 3/8" acrylic to hold it higher so there is little head pressure.



Closed loop only has the head of the restriction of the plumbing regardless
of height from the tank. the only difference you get between having it
higher up the tank as opposed to sitting on the floor is the extra friction
from the extra 3' or so of pipe, which I highly doubt you could tell any
difference from as long as it didn't have elbows in it.


kc

its quite simple, closed loop has NO HEAD. only the restriction of the
plumbing.

kc

"Chimera" wrote in message
m...
You said:
"Closed loop only has the head of the restriction of the plumbing... "

Why is that- because the head pressure (weight of the water) at the
suction side of the pump equalizes the head height on the pressure
side?

hmmmm.....



"Dragon Slayer" wrote in message
...
"Steve "Srfmon"" wrote in message
...

I'm using it on a closed loop .........................

I built a Hang on bracket out
of 3/8" acrylic to hold it higher so there is little head pressure.



Closed loop only has the head of the restriction of the plumbing
regardless
of height from the tank. the only difference you get between having it
higher up the tank as opposed to sitting on the floor is the extra
friction
from the extra 3' or so of pipe, which I highly doubt you could tell any
difference from as long as it didn't have elbows in it.


kc

"Dragon Slayer" wrote in message
...
its quite simple, closed loop has NO HEAD. only the restriction of the
plumbing.

kc


I have to chime in again with my experience in the HVAC field.
Dragon Slayer (kc) is correct in the fact that there is no added head
pressure from vertical lift in a closed loop system.

In a Closed Loop System water has no where to go other than the loop that it
is in..
You can not compress water so if the pump moves a drop of water in a given
direction, it pushes the rest of the water all the way through the loop
reguradless of gravity.

HTH

~Mort