90 degree turns and water pressure

[striperseeker]

Does adding 90-degee turns reduce water pressure and flow like adding them to HVAC ducting does to air flow? I have to add some in for a SWG I'm thinking of putting in and was wondering. I know the SWGs have pressure requirements (max usually). I'm thinking of the RJ-60+ by Circupool.
TIA

 

[JamesW]

Adding a 90 is equivalent to adding about 5.2 to 5.7 feet of pipe.

So, it makes some difference, but not enough to worry about.

Using an 8 feet per second velocity (84 gpm in 2" PVC pipe), the head loss per 100 feet of pipe is about 10 to 12 feet, which is about 0.10 to 0.12 feet of head loss per foot of PVC pipe.

A regular 90 at 5.75 feet of pipe (equivalent) is 5.75 x 0.11 = 0.6325 feet of head loss.

A Sweep 90 at 2.10 feet of pipe (equivalent) is 2.10 x 0.11 =0.231 feet of head loss.

However, the flow rarely needs to go above 40 gpm for a residential system, so that is a velocity of 3.9 feet per second.

That is 0.028 feet of head loss per foot of 2" pipe.

A regular 90 at 5.75 feet of pipe (equivalent) is 5.75 x 0.028 = 0.161 feet of head loss.

A Sweep 90 at 2.10 feet of pipe (equivalent) is 2.10 x 0.028 =0.0588 feet of head loss.

So, you are saving about 0.1022 feet of head loss per sweep 90 vs. a regular 90.

Even at 10 sweep 90s, that is only 1.022 foot of head loss, which is pretty insignificant.

1.022 foot of head loss is 0.44 psi.

 

[ajw22]

I know the SWGs have pressure requirements (max usually).

Most SWGs have no practical max pressure and at the cell there is not a high pressure unless you have an IFCS.

 

[JamesW]

All equipment has pressure limits.

4. The warranty contains the following exclusions.

G. Damage due to over-tightening of threaded components or excessive pressure or stress.

https://www.circupool.com/assets/doc/CircuPool-RJ-PLUS-Manual.pdf

Salt cells are intended to be installed after your pool filter, so they do not experience a build up of pressure because the water flows through them freely back to the swimming pool. This is unlike your filter, which has a pressure gauge because it is designed to hold a build up of internal pressure as it resists the water flow as it forces the water through its filter media.

What is the RJ+ cell unit's maximum pressure (PSI) rating? ()

Salt cells are intended to be installed after your pool filter, so they do not experience a build up of pressure because the water flows through them freely back ...

answers.circupool.com

https://www.swimolympic.com/images/HaywardEquip/AquaRiteXL_Brochure.pdf

 

[JamesW]

https://lesl.a.bigcontent.io/v1/static/W3AQR15-aqua-rite-salt-chlorination-data-sheet

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https://www.jandy.com/en/products/water-care/salt-chlorinators/truclear-xl

 

[JoyfulNoise]

SWG’s have flow switches, not pressure switches. Pressure isn’t an issue, it’s minimum flow rate. Most SWG flow switches close at 15GPM.

Elbows add to head loss but it’s barely noticeable for pool plumbing.

 

[ajw22]

All equipment has pressure limits.

I think you have said before that pool pumps cannot get over 30 or 40 PSI.

Those high pressure limits you are showing are not meaningful to anyone here. What's the point?

 

[JamesW]

Jandy Truclear says that an In-Floor cleaning system will violate warranty.

 

[ajw22]

Jandy Truclear says that an In-Floor cleaning system will violate warranty.

And the relevance to the OP is????

 

[JamesW]

4. The warranty contains the following exclusions.

G. Damage due to over-tightening of threaded components or excessive pressure or stress.

Circupool says that excessive pressure is not covered under warranty.

I could not find a specific PSI, but Circupool can claim that the pressure was excessive.

 

[JamesW]

I'm thinking of the RJ-60+ by Circupool.

They have not decided on a particular model.

Maybe the TruClear was also being considered.

 

[ajw22]

4. The warranty contains the following exclusions.

G. Damage due to over-tightening of threaded components or excessive pressure or stress.

Circupool says that excessive pressure is not covered under warranty.

I could not find a specific PSI, but Circupool can claim that the pressure was excessive.

Then I suggest the OP check with Circupool if it is a concern since a recent member said when asked Circupool said the RJ series cells no longer had a pressure limit.

 

[ajw22]

They have not decided on a particular model.

Maybe the TruClear was also being considered.

Maybe you should ask rather then stomp on a thread.

Stomping on threads is frowned upon here.

 

[JamesW]

I know the SWGs have pressure requirements (max usually).

The OP was concerned about pressure limits.

I was providing relevant information about pressure limits as specified by manufacturers for general reference.

 

[ajw22]

The OP was concerned about pressure limits.

I was providing relevant information about pressure limits as specified by manufacturers for general reference.

You may imagine so.

My reading comprehension is that he is asking about how 90-degee turns reduce water pressure and flow.

His throwaway line about max pressure says he is aware of max pressures, not lower pressures. Again, when in doubt why not ask the OP instead of assuming and stomping on the thread with possible irrelevant information?

I do not read the OP as asking about max pressures.

 

[JamesW]

I do not read the OP as asking about max pressures.

I do read it that way.

It is a difference of opinion and I am providing information that I think is of concern to the OP.

They can clarify if they want.

I do not agree that I am "Stomping" on the thread.

 

[ajw22]

I do not agree that I am "Stomping" on the thread.

Of course not.

 

[ajw22]

I'm thinking of the RJ-60+ by Circupool.

Well, you have many likely irrelevant posts from others to wade through. But this is the Internet so you should expect nothing less.

Let us know how else we can help.

The Circupool RJ45+ is a fine SWG used by many here.

Circupool SWG - Further Reading

www.troublefreepool.com