You can use this to get an idea of what you need to do.
<p>1.1* Scope.<br />1.1.1 <br />This standard shall provide the minimum requirements for the design and installation of automatic fire sprinkler systems and exposure protection sprinkler systems covered within this standard.<br />1.1.2* <br />This standard shall not provide requirements for...
www.nfpa.org
However, your best bet is to contact a local company to figure things out, a sprinkler installation and service company. They will use a
fire protection engineer (FPE) to determine exactly what will meet your current adopted fire safety code by (usually) your state legislature. Even with that, there can be additional requirements as adopted by your local government, i.e., your county government. The liability to you trying to make-do is not worth the risk, and as-such, you need in this instance to retain the services of a qualified contractor. An interesting note, when a friend sat for her P.E. exam, she said,
"the only test-takers with more volumes in-front of them were the FPE candidates." There are more licensed psychiatrists in the USA than there are FPE holders. It's a hard one to attain.