How much flow can be put through 1.5" PVC?
- Thread starter RuffReef
- Start date
read this old link
if you mean as a drain: between 695-957 gph
http://www.wetwebmedia.com/BulkheadFloRateArt.htm
if you mean as a drain: between 695-957 gph
http://www.wetwebmedia.com/BulkheadFloRateArt.htm
do you like math?
ahhh.. the answer is "a lot"
get schedule 80 (80PSI) to be safe
it depends on many variables, pressure gradient, radius, length, fluid viscosity
FR = (Pi (R to the 4th power) (P - Po))/(8 N L)
where FR is the volumetric flow rate of the liquid (e.g., gal/sec),
Pi = 3.14159..., R is the radius of the pipe or tube, Po is the fluid
pressure at one end of L, P is the fluid pressure at the other end of
L, N is the fluid's viscosity, and L is the length of the pipe or
tube. The temperature dependency here is in N because the fluid's
viscosity depends on its temperature.
ahhh.. the answer is "a lot"
get schedule 80 (80PSI) to be safe
it depends on many variables, pressure gradient, radius, length, fluid viscosity
FR = (Pi (R to the 4th power) (P - Po))/(8 N L)
where FR is the volumetric flow rate of the liquid (e.g., gal/sec),
Pi = 3.14159..., R is the radius of the pipe or tube, Po is the fluid
pressure at one end of L, P is the fluid pressure at the other end of
L, N is the fluid's viscosity, and L is the length of the pipe or
tube. The temperature dependency here is in N because the fluid's
viscosity depends on its temperature.
that equation is great. but to run pipe larger than the discharge pipe of the volute is not always necessary. pump manufactures design the discharge the the capacity of the pump. even the equation takes the pipe dia into consideration. if you have a long distance, many 90 l's and a lot of head (pressure to pump at an elevation) you don't need to use larger dia. pipe. 1 1/2 sch 80 pvc is rated at 3300 psi if you plan on using that much pressure you are in an industrial application.
"How much FLOW can be put through 1.5" PVC?"
RuffReef posed an simple question, and the equation should clearly show that flow is:
1. directly dependent on the difference in pressure from the pump to the final discharge
* pressure is decreased by turns in the pipe and height against gravity.
2. dependent on the radius to the 4th power, which is fixed in this case at 1.5 inches
*note, if you double the pipe radius, flow increases 16-fold.
3. decreased by more viscous liquid, which is fixed by the viscosity of salt water
*higher temp and more dissolved salt decreases viscosity, causing more flow)
4. decreased as the pipe length get longer due to friction
operationally speaking, you got testimony of flows of 10,000 gph+, and that schedule 80 pipe can take over 3300psi, so if there is a problem it will likely be at connections.
the question was of FLOW, not pressure. can you have a huge amount of flow at low pressure? of course. in the aquarium trade, its called dump buckets and aquarium runways.
I just wanted to give enough info to help him fully understand the question, not to show off. even though I do use that laminar flow equation at work all the time & I've been formally tested on it.
I think we've mentally masturbated enough on this, and Ruffreef should have enough info to come to his own conclusions about his application.
RuffReef posed an simple question, and the equation should clearly show that flow is:
1. directly dependent on the difference in pressure from the pump to the final discharge
* pressure is decreased by turns in the pipe and height against gravity.
2. dependent on the radius to the 4th power, which is fixed in this case at 1.5 inches
*note, if you double the pipe radius, flow increases 16-fold.
3. decreased by more viscous liquid, which is fixed by the viscosity of salt water
*higher temp and more dissolved salt decreases viscosity, causing more flow)
4. decreased as the pipe length get longer due to friction
operationally speaking, you got testimony of flows of 10,000 gph+, and that schedule 80 pipe can take over 3300psi, so if there is a problem it will likely be at connections.
the question was of FLOW, not pressure. can you have a huge amount of flow at low pressure? of course. in the aquarium trade, its called dump buckets and aquarium runways.
I just wanted to give enough info to help him fully understand the question, not to show off. even though I do use that laminar flow equation at work all the time & I've been formally tested on it.
I think we've mentally masturbated enough on this, and Ruffreef should have enough info to come to his own conclusions about his application.
i am not questioning the equation. that is the same one that all pump engineers use. but as the person that rebuild pumps after they are installed, i am not smart enough to place all of the variables in the equation. i just know that pump engineers do that when they design a pump.. I was just trying to make it easier for the average guy to know, engineers much smarter than most of us calculated this before they sent to pump out on the market. I can't even figure the flow chart they send with the pumps. but i do know that the equation works every time. but the average guy doesn't use the volute discharge orifice as the smallest diameter. heck, i am totally impressed that anyone can come up with the equation. btw i am not sure that some of the designers can figure it out.
