Your Google-Fu is weak...
Gouge on the flight deck "rainbow wardrobe" from the CHINFO website:
http://www.chinfo.navy.mil/navpalib/ships/carriers/rainbow.html
For piping, here's a "short list" of the most significant:
Fire main - RED
JP-5 Fuel line - PURPLE
Chill/feed water - LIGHT BLUE
Potable water - BLUE
HP Air - DARK GRAY
Steam lines - lagged in WHITE
Salt water - GREEN
Fuel oil/gasoline: YELLOW
For the "Real Geek" in you (courtesy of Naval Safety Center):
DC-29: COLOR CODING PIPING SYSTEMS:
AFFF Concentrate Light blue
AFFF Discharge Red
Amine Brown
Chilled water Light blue
Deballast air Tan
Demineralized electroniccooling water Light blue
Feed water Light blue
Firemain Red
Fireplugs Red
Freon Dark purple
Fuel oil Yellow
Gasoline Yellow
HP air Dark gray
Halon Gray
Helium & Oxygen Buff
Helium Buff
Hydraulic Orange
Hydrogen Chartreuse
Jacket water Light blue
JP-5 Purple
LP air Tan
Lube oil Yellow
Nitrogen Light gray
Oxygen Light green
Potable water Dark blue
Sea water Dark green
(other than firemain, sprinkling and washdown)
Sewage Gold
Steam & steam drains White
But there's LOTS more...like striped valve handles for various commodities. Makes my head hurt...but it's all important when things go to hell in a handbasket...