Here are the standards that f81aa mentioned for pressure tanks if anyone needs them plus a fire protection handbook...

NFPA 13-2010 Standard for the Installation of Sprinkler Systems.pdf

[link Point to another website Only the registered members can access]
NFPA 14 2010 Standard for the Installation of Standpipe and Hose Systems.pdf

[link Point to another website Only the registered members can access]
NFPA 15 2007 Water Spray Fixed Systems for Fire Protection 71pgs.pdf

[link Point to another website Only the registered members can access]
Industrial Fire Protection Handbook.pdf

[link Point to another website Only the registered members can access]