Capital Projects Home Page

Appendix VI

Pipe And Conduit Identification Standards

Identify all accessible pipe and conduit by stenciled letters or pipe markers. Locate so identification is visible from expected personnel approach. Space at 30' maximum with at least one in each room and one directly adjacent to each main, sectionalizing or isolating valve. Color shall be black.

Lettering Size For Pipe And Conduit Identification
O.D. of Pipe or Insulation	Height of Lettering
2" and smaller	.5
Over 2"	1"

Mandatory Symbols For Pipe And Conduit Identification
F	Automatic Fire Sprinkler
LV	Laboratory Vent
LW	Laboratory Waste
ChWR	Chilled Water Return
ChWS	Chilled Water Supply
Com	Communications Conduit
CA---	Compressed Air (with Pressure)
CR	Condensat Return
DI	Deionized Water
DW	Distilled Water
DCW	Domestic Cold Water
DHW	Domestic Hot Water
DHWR	Domestic Hot Water Return
DSP	Dry Standpipe
E	Electric Conduit
FA	Fire Alarm Conduit
G	Natural Gas (with pressure if above 8" W.C.)
HHW	Heating Hot Water
HHWR	Heating Hot Water Return
HPS	High Pressure Steam (41 psi and over)
ICW	Industrial Cold Water
IHW	Industrial Hot Water
IHWR	Industrial Hot Water Return
LPS	Low Pressure Steam (up to 15 psi)
MPS	Medium Pressure Steam (16 to 40 psi)
OX	Oxygen
RWL	Rain Water Leaders (including drains)
HG	Refrigerant Hot Gas
RL	Refrigerant Liquid
RS	Refrigerant Suction
SS	Sanitary Sewer
V	Sanitary Vent
Tel	Telephone Conduit
TWR	Tower Cooling Water Return
TWS	Tower Cooling Water Supply
VAC	Vaccum Laboratory
WSP	Wet Standpipe System

Return to Appendix