I understand that I have to make a certain number of pipe circuits because of its length?
Each circuit would be approximately 200 meters, generally no more. If you run a circuit above the recommended length, then you can run into a problem with, too much “pressure drop” across the loop. You would run the circuits with a header and a reverse parallel. From the header you would run the circuits as, first pipe into the outgoing header would be the last pipe out of the incoming header.
