Section 1 • General Information
Piping & Identification Component Tags
Use this list to identify components shown in the Piping & Identification Diagram.
A | Atmosphere |
AN | Anode - Sacrificial |
AV | Angle Valve |
BFV | Butterfly Valve |
BDV | Automatic Blowdown |
| Valve |
BV | Ball Valve |
CCompressor
CPL Coupling
CRR | Cooling Refrigerant Liquid |
| Return |
CRS | Cooling Refrigerant Liquid |
| Supply |
CS | Carbon Steel or Cold Side |
CV | Check Valve |
CWR | Cooling Water Return |
CWS | Cooling Water Supply |
DDrive Motor or Drain
EHeat Exchanger
EQ | Equalizing Line |
F | Fan |
FC | Fail Closed or Flow |
| Controller |
FG | Flow Switch Indicator or |
| Glass |
FI | Flow Indicator |
FIT | Flow Indicating |
| Transmitter |
FO | Fail Open |
FSI | Flow Sight Indicator |
FT | Flow Transmitter (Blind) |
FV | Flow Control Valve |
| (Pneumatic Actuator) |
GLV | Globe Valve |
GTV | Gate Valve |
HS | Hand Switch or Hot Side |
HEV | Hand Expansion Valve |
HV | Hand Valve |
IA | Instrument Air |
II | Current Indicator |
IT | Current Transmitter |
JB | Electrical Terminal Box or |
| Junction Box |
LC | Level Control |
LE | Level Probe |
LI | Level Indicator or Gauge |
LIT | Liquid Level Indicating |
| Transmitter |
LO | Lube Oil or Lock Open |
LP | Local Panel |
LSH | Level Switch High |
LSHH | Level Switch Shutdown |
| High High |
LSL | Level Switch Low |
LSLL | Level Switch Shutdown |
| Low Low |
LV | Level Control Valve - |
| Pneumatic Actuator |
MCC | Motor Control Center or |
| Motor Starter |
MV | Motor Operated Valve |
MGV | Manifold Gauge Valve |
MI | Moisture Indicator |
N | Nitrogen |
NC | Normally Closed |
NO | Normally Open |
NV | Needle Valve |
P | Pump or Process |
PDI | Differential Pressure |
| Indicator - Gauge |
PDIT | Differential Pressure |
| Indicating Transmitter |
PDSH | Differential Pressure |
| Switch High |
PDSHH Differential Pressure
| Switch Shutdown High |
| High |
PDSL | Differential Pressure |
| Switch Low |
PDSLL | Differential Pressure |
| Switch Shutdown Low |
| Low |
PDT | Differential Pressure |
| Transmitter - Blind |
PDV | Differential Pressure |
| Control Valve - Pneumatic |
| Actuator |
PI | Pressure Indicator or |
| Gauge |
PIT | Pressure Indicating |
| Transmitter |
PSH | Pressure Switch High |
PSHH | Pressure Switch |
| Shutdown High High |
PSL | Pressure Switch Low |
PSLL | Pressure Switch |
| Shutdown Low Low |
PSV | Pressure Safety Relief |
| Valve |
PT | Pressure Transmitter |
| - Blind |
PV | Pressure Control Valve |
QE | Heater Element - |
| Immersion Heater |
R | Refrigerant |
RD | Rupture Disc |
SDV | Automatic |
SG | Sight Glass |
SSStainless Steel or Heat Exchanger Shell Side
STR | Strainer |
SV | Safety Relief or Slide Valve |
SW | Selector Switch |
TE | Temperature Element - |
| RTD or Thermocouple |
VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG | 1 – 7 |
