Appendix H: Piping Identification Guide

Pipe Service	Background Color	Letter Color	Full Name	Abbreviation
Acetylene	Yellow	Black	ACETYLENE
Acid Vent	Yellow	Black	ACID VENT	AV
Acid Waste	Yellow	Black	ACID WASTE	AW
Argon	Blue	White	ARGON
Carbon Dioxide	Yellow	Black	CARBON DIOXIDE
Chilled Water Return	Green	White	CHILLED WATER RETURN	CHR
Chilled Water Supply	Green	White	CHILLED WATER SUPPLY	CHS
Compressed Air	Green	White	COMPRESSED AIR	AIR
Condenser Water Return	Green	White	CONDENSER WATER RETURN	CWR
Condenser Water Supply	Green	White	CONDENSER WATER SUPPLY	CWS
Deionized Water (Supply & Return)	Green	White	DEIONIZED WATER	D.I. WATER
Distilled Water (Supply & Return)	Green	White	DISTILLED WATER
Domestic Cold Water	Green	White	DOMESTIC COLD WATER	DOM. CW
Domestic Hot Water Return	Yellow	White	DOMESTIC HOT WATER RETURN	DOM. HW
Domestic Hot Water Supply	Yellow	White	DOMESTIC HOT WATER SUPPLY	DOM. HWR
Fire Water	Red	White	FIRE WATER	FIRE
Helium	Blue	White	HELIUM
Hot Water Return	Yellow	Black	HOT WATER RETURN	HWR
Hot Water Supply	Yellow	Black	HOT WATER SUPPLY	HWS
Hydrogen	Yellow	Black	HYDROGEN
Irrigation Water	Green	White	IRRIGATION WATER
LP Gas	Yellow	Black	LP GAS
Make-up Water	Green	White	MAKE-UP WATER
Natural Gas	Yellow	Black	NATURAL GAS
Nitrogen	Blue	White	NITROGEN
Nitrous Oxide	Yellow	Black	NITROUS OXIDE
Non-Potable Water	Green	White	NON-POTABLE WATER
Oxygen	Yellow	Black	OXYGEN
Reverse Osmosis Water (Supply & Return)	Green	White	R.O. WATER
Sanitary Vent	Yellow	Black	SANITARY VENT
Sanitary Waste	Yellow	Black	SANITARY WASTE
Steam	Yellow	Black	STEAM
Steam Condensate	Yellow	Black	CONDENSATE
Hazardous Materials	Yellow	Black
Low Hazard Liquid	Green	White
Fire Quenching Materials	Red	White
Low Hazard Gasses	Blue	White

Last Updated: Mar 25, 2011