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can have the code of practice for the installation of sprinkler head?
I always talk to the guy at the hardware store. He knows all about sprinklers?
Start with ICC, or NFSA if you are talking about fire sprinklers. ICC for building code, NFSA for all else.
You might also look to you local plumber and pipefitters union.
They can all be 'googled'
Try TYCO they have a book on sprinklers that details everything you want.
a 1/2" sprinkler = 0.15 gpm/ Sft
NFPA 13 mandate states min 7 psi pressure