Engineering Standards: SYMBOLS

NOTE: Must have AutoCAD to open DWG files.

Individual P&ID and PFD Symbols
LEGEND.dwg	P038 Not Used	P099 - compressed air	P152 - horiz. centrifugal pump
	P039 - instrument ID table	P100 - ducted air flow from space	P153 - centrifugal fan w/variable inlet vanes
P001 - electromagnetic/sonic	P040 - valve & instr. ID letters	P101 - capped air duct	P154 - blower/centrifugal fan
P002 - undefined digital	P041-49 Not Used	P102 - gate valve - open	P155 - rotary pump
P003 - pneumatic signal	P050 - Not Used	P103 - gate valve - closed	P156 - vertical wet pit pump
P004 - hydraulic signal	P051 - angle valve	P104 - globe valve - open	P157 - progressive cavity pump
P005 - capillary tube	P052 - butterfly valve	P105 - globe valve - closed	P158 - vertical sump pump
P006 - electromagnetic/sonic	P053 - rotary valve	P106 - needle valve - open	P159 - fluid pump
P007 - internal system link	P054 - 3 way	P107 - needle valve - closed	P159A - Not Used
P008 - mechanical link	P055 - 4 way	P108 - plug valve - open	P160 - axial fan
P009 - pneumatic binary signal	P056 - OS & Y	P109 - plug valve - closed	P161 - axial fan w/variable inlet vanes
P009A - dashed2/electric binary	P057 - diaphragm	P110 - ball valve - open	P162 - 2-stage reciprocating air compressor
P010 Not Used	P058 - pressure relief	P111 - ball valve - closed	P163 - single stage reciprocating air compressor
P011 - Electrical Heat Tracing	P059 - diaphragm actuator	P112 - check valve	P164 - 2-stage rotary tooth air compressor
P011A - cont/dash2-steam heat	P060 - 2 way, fail closed	P113 - spring check valve	P165 - reciprocating pump
P012 - discrete instrum./primary location/accessible	P061 - 2 way, fail open	P114 - angle valve - open	P166 - pressure vessels, vertical or horizontal
P013 - shared display./primary location/accessible	P062 - 3 way, w/diaphragm	P115 - angle valve - closed	P167 - tank
P014 - computer./primary location/accessible	P063 - 4 way w/diaphragm	P116 - safety/relief valve (inlet port shown closed)	P168 - HVAC coils (HW, DX, CH, STM, HCL, CCL)
P015 - programmable logic./ primary location/accessible	P064 - spring-opposed, single actuator	P117 - 3-way valve (closed port darkened)	P169 - unit heater (HW, DX, STM, HCL)
P016 - discrete instr./ field mounted	P065 - spring-opposed, double actuator	P118 - 4-way valve (arrows indicate flow)	P170 pressure gas bottle
P017 - shared display/ field mounted	P066 - electrohydraulic actuator	P119 - ball check valve	P171 - double containment tank
P018 - computer / field mounted	P067 - hand actuator or wheel	P120 - dual purge vlave	P172 - humidifier
P019 - programmatic logic/ field mounted	P068 - restriction orifice	P121 - alarm valve	P173 - manual balance damper
P020 - discrete instr../primary location/accessible	P069 - restriction orifice drilled in valve	P122 - air intake filter	P174 - Not Used
P021 - shared display./primary location/accessible	P070 - flow straightening valve	P123 - alarm	P175 - multi-point pitot tube array
P022 - computer./primary location/accessible	P071 - diaphragm pressure-balanced	P124 - bubble gauge	P176 - damper
P023 - programmable logic /primary location/accessible	P072 - pressure-reducing regulator-self contained/ adjustable set-point	P125 - in-line filter	P177 - Not Used
P024 - discrete instr../primary location/accessible	P073 - pressure reducing regulator w/external pressure tap	P126 - atmospheric filter	P178 - evaporative air cooler
P025 - shared display./primary location/accessible	P074 - differential pressure regulator	P127 - double basket strainer	P179 - opposing blade damper
P026 - computer./primary location/accessible	P075 - back pressure regulator - self contained	P128 - hose reel	P180 - back draft damper
P027 - programmable logic ./primary location/ accessible	P076 - back pressure requlator wi/external tap	P129 - open drain (schematic)	P181 - separator
P028 - flow indicator for P016	P077 - pressure reducing regulator w/integral outlet pressure relief	P130 - drain system annotations	P182 - single duct variable volume box
P029 - instruments common housing	P078 - pressure indicator	P131 - drain (plan view)	P183 - wing type face & bypass damper
P030 - patchboard-point 12	P079 - flow direction	P132 - cleanout (plan view)	P184 - collection bin
P031 - purge/reset/interlock	P080 - pressure relief or safety valve	P133 - sanitary vent	P185 - cyclone separator
P031A - signal directional	P081 - vacuum relief valve	P134 - silencer/muffler	P186 - fluid recovery pump
P032 - S / D / P / T / M / SP	P082 - pressure/safety valve, straight-through w/integral pilot	P135 - space penetrations	P187 - dual service heat exchanger
P032A - root extraction	P083 - rupture disk/safety head for vacuum relief	P136 - fixed louvers	P187A - single service heat exchanger
P032B - bias	P084 - rupture disk/safety head for pressure relief	P137 - trap XX annotates	P188 - multi blade damper
P032C - multiply	P085 - pilot light	P138 - lubricator	P189 - opposing blade damper
P032D - high selecting	P086 - flex connection (rubber)	P139 - 55 gallon drum	P190 - single blade damper
P032E - low selecting	P087 - flex connection	P140 - thermostatic vent	P191 - motor
P032F - high limiting	P088 - single or venturi pitot tube	P141 - sprinkler alarm	P192 - test port
P032G - low limiting	P089 - flow meter	P142 - flow alarm valve	P193 - infrared heater
P032H - proportional	P090 - reducer	P143 - flow control valve	P194 - heater
P032I - reverse proportional	P091 - screwed cap	P144 - suction diffuser	P195 - diaphragm lined tank
P032J - summing	P092 - hose connection	P145 - automatic air vent	P196 - mist eliminator
P032K - dividing	P093 - pipe cap	P146 - balancing valve	P197 - HEPA filter
P033 - equipment tag	P094 - hose connection	P147 - gas plub	P198 - carbon absorber filter
P034 - piping class break or ML change	P095 - flanged connection (piping or equip)	P148 - Not Used	P199 - filter
P035 - pipe/wire continued, arrowpoint right	P096 - flow orifice fixed	P149 - Not Used
P036 - pipe/wire continued, arrowpoint left	P097 - strainer with valve	P150 - cooling tower
P037 - pipe/wire continued, arrowpoint both	P098 - Y-strainer	P151 - chiller
End of P&ID and PFD Symbols

Date	SymNo.	Reason for Revision
9/16/04	P003, P009A, P038, P100, P146-149, P159A, P174, P187A, A194, P199	Modifications, additions, deletions.

To be notified of any changes to these documents, contact Tobin Oruch, Standards Manager.
Please feel free to send feedback/suggestions to the Discipline POC, Richard Trout