Help hard plumbing

[Fish Fan]

If it's helpful, BRS investigated whether 90 degree elbows really restrict water flow, and they determined that using 90's didn't restrict flow nearly as much as is often stated:


I hope this helps!

 

[mcarroll]

Im confused again, wouldnt the link I provided reasonably contradict your statement that the 90s would provide negligible head loss? The link I provide (and see on numerous other hobbyist sites) indicate that a 90 would create a 1 foot head pressure loss. With the amount of 90s OP is using, that would account for notable loss in comparing to the pumps flow curve. I do understand completely why smaller pipe reduces flow, stiction, turbulence, etc. Why is why im rather shocked the calculator you linked indicates a minimal or even negligible reduction in flow for what would be a significant introduction of restriction by those forces in several 90s. What am I misunderstanding?

...it may be true that a 90° fitting puts a foot of length onto the total plumbing length (which does compute into head pressure) but it does not add a foot onto head pressure directly.

 

[KStatefan]

Im confused again, wouldnt the link I provided reasonably contradict your statement that the 90s would provide negligible head loss? The link I provide (and see on numerous other hobbyist sites) indicate that a 90 would create a 1 foot head pressure loss. With the amount of 90s OP is using, that would account for notable loss in comparing to the pumps flow curve. I do understand completely why smaller pipe reduces flow, stiction, turbulence, etc. Why is why im rather shocked the calculator you linked indicates a minimal or even negligible reduction in flow for what would be a significant introduction of restriction by those forces in several 90s. What am I misunderstanding?

This from your link "Roughly every 10 feet of pipe (horizontal & vertical) through which water is traveling adds 1 foot of head pressure. Additionally, every 90-degree bend adds 1 foot of head pressure. " is not correct.

The head loss is dependent on the velocity of the fluid.

500 GPH thru a 1/2" 90° fitting will create approximately 0.41 feet of headloss but thru a 1" fitting only 0.1 feet.

 

[jmaneyapanda]

If it's helpful, BRS investigated whether 90 degree elbows really restrict water flow, and they determined that using 90's didn't restrict flow nearly as much as is often stated:


I hope this helps!

I did watch that, but it more shows theres no difference between 45s and 90s. However it did for teh most part show that 90s create a flow loss/loss of head pressure.

 

[jmaneyapanda]

...it may be true that a 90° fitting puts a foot of length onto the total plumbing length (which does compute into head pressure) but it does not add a foot onto head pressure directly.

OK, so the link I posted from ETM is wrong youre saying. They state: "Additionally, every 90-degree bend adds 1 foot of head pressure." Thats incorrect?

 

[jmaneyapanda]

This from your link "Roughly every 10 feet of pipe (horizontal & vertical) through which water is traveling adds 1 foot of head pressure. Additionally, every 90-degree bend adds 1 foot of head pressure. " is not correct.

The head loss is dependent on the velocity of the fluid.

500 GPH thru a 1/2" 90° fitting will create approximately 0.41 feet of headloss but thru a 1" fitting only 0.1 feet.

Are you using the previously linked formulary to detrmine that?

 

[KStatefan]

OK, so the link I posted from ETM is wrong youre saying. They state: "Additionally, every 90-degree bend adds 1 foot of head pressure." Thats incorrect?

Yes that is incorrect

 

[jmaneyapanda]

Yes

Cool, thanks.

 

[KStatefan]

Are you using the previously linked formulary to detrmine that?

I used the Pentai calculator. I do not know what was linked before.

 

[jmaneyapanda]

I used the Pentai calculator. I do not know what was linked before.

Can you link that calculator? Thank you.

 

[KStatefan]

Can you link that calculator? Thank you.

https://pentairaes.com/pump-calculator?srsltid=AfmBOorilXD3BBwpi2BfSMyaV_eJCT8RquXOaALf75jWCLoqyEiFZ-eF

 

[jmaneyapanda]

Can you link that calculator? Thank you.

https://pentairaes.com/pump-calculator?srsltid=AfmBOorilXD3BBwpi2BfSMyaV_eJCT8RquXOaALf75jWCLoqyEiFZ-eF

Thank you!

 

[mcarroll]

https://pentairaes.com/pump-calculator?srsltid=AfmBOorilXD3BBwpi2BfSMyaV_eJCT8RquXOaALf75jWCLoqyEiFZ-eF

Very cool...somehow I didn't even know pentair had a calc ("thanks" a lot, Google!).

It seems to be good and more or less in agreement with the calc I posted earlier, but I think I still like this a bit more for calculating friction losses: (https://inventory.powerzone.com/resources/friction-loss-calculator/)

It's simple to use like the Pentair calc and mostly asks for the same data. It has a little more visualization for what that's worth. It's interesting IMO that it reports results from three different friction loss equations for comparison in addition to reporting flow velocity.