Any Max and Min distance requirement between branches?

heatingFun

In a 2-pipe reverse return system, is there any max and min distance requirement between the supply pipes for different branches? how about return pipes?



I need to add two more zones onto the existing one zone system. I am thinking extend the main supply pipe and then turn 90 degree to add two more branch supply pipes. I am wondering how far or how close to the existing supply pipe I can add the first new supply pipe.



The return will do the same



The picture was taken 3yrs ago when the system was installing. I added black lines and red lines to show what I am talking about.

Snowmelt

Nope

Just enough to work on,

How ever if that's a return & supply on the right of the closely spaced tees I suggest butting the return on the left side of the tee