Page 487 - Boiler_Operators_Handbook,_Second_Edition

472 Boiler Operator’s Handbook

HPC ...............High pressure condensate N ...................Nitrogen
2
HPS ................High pressure steam NG .................Natural gas
HPS ................High pressure switch NRV ...............Non-return valve
HTS ................High temperature switch O ...................Oxygen
2
ID ...................Induced draft O T ................Oxygen transmitter
2
IDF .................Induced draft fan OCV ...............Oil flow control valve
IGV#* ............Ignitor gas safety shutoff valve OF ..................Overflow
IPS ..................Intermediate pressure steam OFT ................Oil flow transmitter
IT ....................Ignition timer OPMS ............Oil pump motor starter
IT ....................Ignition transformer (see IX) OPR ...............Oil pressure regulator
IVV# ..............Ignitor gas vent valve OV#*..............Oil safety shutoff valve
IX....................Ignition transformer PC ..................Pressure controller
LAAD ............Low atomizing air differential pressure PC ..................Pumped condensate
(limit switch) PI ....................Pressure indicator
LAAP.............Low atomizing air pressure switch PIC .................Pressure indicating controller
LAF ................Low air flow (limit switch) PPT ................Post purge timer
LASD .............Low atomizing steam differential pressure PR ..................Pressure recorder
(limit switch) PR ..................Pressure regulator
LASP Low atomizing steam pressure (limit switch) PRV ................Pressure reducing valve (station)
LC ..................Level controller PT ...................Purge timer
LDS ................Low draft switch PT ...................Pressure transmitter
LG ..................Level glass PV ..................Plug valve
LGP ................Low gas pressure (limit switch) RO ..................Reverse osmosis
LI ....................Level indicator ROW ..............Reverse osmosis water (permeate)
LIC .................Level indicating controller ROV ...............Recirculating oil valve
LIGP ..............Low ignitor gas pressure (limit switch) RV ..................Recirculating valve
LOP ................Low oil pressure (limit switch) RV ..................Relief valve
LOT................Low oil temperature (limit switch) SAN ...............Sanitary sewer
LPC ................Low pressure condensate SOFT# ...........Softener
LPHTR ..........Low pressure heater SPT .................Steam pressure transmitter
LPS .................Low pressure switch STM ...............Steam
LPS .................Low pressure steam STRNR ..........Strainer
LR ..................Level recorder SV ...................Safety valve
LS ...................Level switch SW .................Softened water
LSH ................Level switch, high level TC ..................Temperature controller
LSL .................Level switch, low level TE ...................Temperature element
LT ...................Level transmitter TI ....................Temperature indicator
LTS .................Low temperature switch TIC .................Temperature indicating controller
LWCO ...........Low water cutoff TR ..................Temperature recorder
LWFS .............Low water flow switch TSTAT ............Thermostat
LWL ...............Low water level TT ...................Temperature transmitter
MAFS ............Minimum air flow switch (limit switch) TV ..................Globe valve (throttling valve)
MBDI .............Mixed bed demineralizer VC ..................Vent condenser
MGPR ............Minimum gas pressure regulator VTR................Vent through roof
MGV#* ..........Main gas safety shutoff valve ZC ..................Position controller (valve positioner)
MOPR............Minimum oil pressure regulator
MS ..................Motor starter NOTE: A mnemonic is a device to help someone remember.
MU .................Makeup water (piping) The letters used in an alphabetic abbreviation help one remem-
MVV# ............Main gas vent valve ber the device that is referred to.