We mix them frequently and I have seen many others do it. Just be sure that if you have 2 k-factors on the same system that you calc a remote area that contains both types. I have found that one line requiring higher operating pressure will drive major over-discharge on the other 2 lines.
Matt From: Sprinklerforum <[email protected]> On Behalf Of Mike Hairfield Sent: Tuesday, June 05, 2018 8:56 AM To: Sprinkler Forum <[email protected]> Subject: Mixing ESFR Sprinklers Is there any No No's to mix different ESFR K factors on a project. My situation is that I have 8 zones fed from the far end of a building, if I use K22's it requires 40 psi end head pressure and K16.8 uses 63 psi. The farthest two zones require some 8" feed mains, the last six zones can work with 6" feed mains using all K22 ESFR's. Now I can get the last three zones to work with K16.8 ESFR's with 6" feed mains. Using both is more economical. Mike
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