Understanding is there a reason for 2x 45s instead of a 90 rplumbing requires examining multiple perspectives and considerations. Is there a reason for 2x 45s instead of a 90? : r/Plumbing - Reddit. There is no point, and you can roll two 45s to achieve a small angle change that a long sweep 90 wouldn't be able to accomplish. By roll do you mean fit a small section of straight pipe in-between them?
Not a plumber (don't shoot). Roll just refers to the ability to change direction when the two fittings don't exactly line up. 2 45's or one sweep 90? It seems putting two 45s has more chance of leaking than one fitting. This perspective suggests that, flow is almost the same.
But 45's means twice as many potential leak points. If properly glued I don't see 45's as a risk unless there is a noted issue with 45's that I am not aware of. Make sure the sweep 90's are SCH 40 and not DWV only fittings.

This perspective suggests that, minor loss in PVC and CPVC fittings expressed as equivalent length of straight pipe. Not really much of a difference, especially for the return lines. And that return pump is going to be very low pressure compared to what PVC could be used for. work out with what you have on hand . Double 45 is a long sweep 90.
Or u just buy a sweep 90. snake with long turns rather than short turns. 2-45’s makes it up.
This perspective suggests that, any Pool Plumbers Here? "Over use of tight-radius 90 deg elbows instead of multiple 45's, or the preferred 90 deg large-radius "sweep" elbows. A 90 deg elbow is the equivalent of like 9 feet of pipe.
Two 45 deg elbows used instead results in a 30% reduction in resistance. Similarly, a large-radius "sweep" elbow is even less. What to use a 90 and when to two 45s in copper piping?. Considering that someone soldered straight copper tubing onto the end of a threaded fitting instead of getting the proper male threaded to slip adapter, I wouldn't have much confidence in the other work this "plumber" did...
Moreover, also, this is garnering close votes for asking "when". Water flow - more through 45 elbows than 90 elbows?. Personally, I always use a 45 degree elbow when I have a choice.

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