We use Schedule 40 pipe for all 1" applications through 4" applications. There is no doubt that it is a stronger pipe. We calculate into the equation the <very> small amount of friction loss. I would rather lose a small amount of pressure and make my zones just a small amount smaller, or use bigger pipe to make up for the difference. I get so sick of thin-wall pipe that everybody else uses. It is cheap, and that is the only reason people use it. Then they try to justify it any way possible. So what if SDR has a thicker wall at 5" than sch 40! Who the hell uses 5" irrigation lines unless you are on a golf course? Then, you are not using SDR or Sch 40, anyway. Thin-wall becomes so brittle, and if anyone dares to have trucks or equipment on the lawn for whatever reason (tree removal, etc...) you can bet the thin-wall will break. Sch 40 will not. We tell customers all the time that you can run over our heads, pipe, fittings, and all, and should have no damage to the system. Yes, it costs more, but our customers know what they are getting versus what they would have gotten with someone else, and are willing to pay extra for it. We also use Hunter Jar-Top valves for all 1" applications because they are so easy to repair, and generally do not require any servicing to begin with. Raise the bar. Be proud of what you do, and use products that will be there years down the road.
-Chris Francis
Chris Francis Landscapes
ChrisFrancisLandscapes.com
Daphne, AL
-Servicing Mobile and Baldwin Counties, and doing the majority of our work in Montrose, AL ; Point Clear, AL ; and Fairhope, AL