Return Re-Plumb Plan - Peer Review

[alferz]

I'm looking to re-plumb the return side of my equipment pad. My goals are to a) add a manual drain valve for the rainy season since my ancient pool has no automatic overflow, and b) to add 2 injection points for an automated chlorine/acid dosing system. I didn't include a check valve because I'm using my Intellicenter schedules and a home grown dosing automation controller (Raspberry Pi with Node-Red) to ensure the pump is running whenever dosing is occurring, plus my heater is 20 years old, but I could be talked into using one. The pipes to and from the pool are all 1.5" so I'm limited there, but all the plumbing at the pad is 2". Anyone care to review?

 

[Texas Splash]

Curious, what is the distance separating the proposed new loop connection from the heater?

 

[alferz]

Curious, what is the distance separating the proposed new loop connection from the heater?

It's about 36" from the heater bulkhead to the first tee feeding the bypass loop.

 

[Texas Splash]

It's about 36" from the heater bulkhead to the first tee feeding the bypass loop.

Shouldn't be a problem. Let's give other a chance to review you photo for more thoughts.

 

[alferz]

Main thing I'm hoping to understand is the fluid dynamics portion. Lets say I have 10 PSI at the heater outlet moving about 45 GPM. How do I know how much of that flow will enter the bypass loop and how much will stay in the main line? As long as its a couple GPM I think it would be sufficient for the very slow dosing speed but wondering how to design the loop to ensure there is some flow through the bypass.