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VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG
Piping & Identifi cation Component Tags
Use this list to identify components shown in the Piping & Identifi cation Diagram.
A Atmosphere
AN Anode - Sacrifi cial
AV Angle Valve
BFV Butterfl y Valve
BDV Automatic Blowdown
Valve
BV Ball Valve
C Compressor
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
D Drive Motor or Drain
E Heat 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 Shut-off Valve
SG Sight Glass
SS Stainless Steel or Heat
Exchanger Shell Side
STR Strainer
SV Safety Relief or Slide Valve
SW Selector Switch
TE Temperature Element -
RTD or Thermocouple
Section 1 • General Information