MECHANICAL ACRONYMS
AC – Air Curtain
ACU – Air Conditioning Unit
AD- Duct/Plenum Access Door
AE – Acoustical Elbow (Refer To Detail This Sheet)
AFF – Above Finished Floor
AFMS – Air Flow Monitor/Measuring Station
AFP – Air Flow Measurement Probe
AFT – Air Flow Transducer/Temperature Monitor
AHU – Air Handling Unit (W/ Integral Devices For Cooling
ADU – Air Handling Unit, W/ Integral Devices For Increased Dehumidification
ARU – Air Handling Unit, W/ Integral Devices For Energy Recovery
AL – Aluminum
ALT – Alternate, Alternative
AMB – Ambient
AP – Access Panel
APD – Air Pressure Drop (In Inches Of Water Column)
AS – Air Separator
AR – Acid Resistant
ARV – Air Relief Valve, Manual Air Vent
AT – Air Transfer
ATD – Air Temperature Drop (In °F, Unless Otherwise Noted)
ATR – Air Temperature Rise (In °F, Unless Otherwise Noted)
ATV – Air Turning Vanes
AUTO – Automatic
AVE – Air Volume Extractor
BCP – Boiler Circulation Pump
BD – Barometric Damper Or Barometric, Counter Balanced Gravity Operated Damper
BDD – Backdraft Damper
BHP – Break Horspower.(In Horsepower)
BLDG – Building
BLR – Boiler
BMS – Build
BOD – Bottom Of Duct/Device (In Units Noted)
BP – Barometric Pressure (In Inches Of Mercury, Unless Otherwise Noted)
BTU – British Thermal Units
BTUH – British Thermal Units Per Hour
CAU – Combustion Air Unit
CBA – Chilled Beam, Active
CBD – Chilled Beam, Active Displacement Air Unit
CBP – Chilled Beam, Passive
CC – Cooling Coil
CCP – Coil Circulation Pump
CD – Control Damper
CF – Cartridge Filter
CFH – Cubic Feet Per Hour (Gas Unit Of Measure)
CFM – Air/Gas Flow Rate (In Cubic Feet Per Minute)
CSF – Chemical Shot Feeder
CHP – Chilled Water Pump
CHR – Chilled Water Return
CHS – Chilled Water Supply
CL – Center Line
CLG – Ceiling
COMP – Compressor
CO – Clean Out
COL – Column
COND – Condenser
CP – Condensate Pump
CRU – Computer Room Unit
CSR – Current Sensing Relay
CT – Cooling Tower
CU – Condensing Unit
CUH – Cabinet Unit Heater
CV – Convector
CWP – Condenser Water Pump
CWR – Condenser Water Return
CWS – Condenser Water Supply
DB – Dry Bulb Temperature (In °F, Unless Otherwise Noted)
DC – Dust Collector
DCW – Domestic Cold Water
DELTAT – Temperature Difference
DHW – Domestic Hot Water
DIA / Ø- Diameter (In Inches, Unless Otherwise Noted)
DOAS – Dedicated Outdoor Air System
DP – Differential Pressure (In Feet Of Head, Unless Otherwise Noted)
DPS – Differential Pressure Switch
DPT – Differential Pressure Transmitter
DS – Duct Silencer
DT – Differential Temperature (In °F, Unless Otherwise Noted)
DU – Dehumidification Unit
DUC – Door Under Cut (In Inches, Unless Otherwise Noted)
DWG – Drawing
E/P – Electrical/Pneumatic
EAT – Entering Air Temperature (In °F, Unless Otherwise Noted)
ECON – Economizer
EF – Exhaust Fan
EFF – Efficiency
EG – Exhaust Grille
EH – Exhaust Hood
ELEV – Elevation
ELEC – Electric, Electrical
EM – Expanded Metal (Minimum Of 70% Free Area, Unless Otherwise Noted)
EMER – Emergency
EQUIP – Equipment
ERC – Energy Recovery Chiller
ERW – Energy Recovery Wheel, Also Referred to as a Heat Wheel
ERV – Energy Recovery Ventilator
ET – Expansion Tank
EWT – Entering Water Temperature (In °F, Unless Otherwise Noted)
EX – Existing
EXH – Exhaust
EXP – Expansion
EXT – Exterior
F&T – Float and Thermostatic Trap
F/SD – Combination Fire/Smoke Damper
FC- Fan Coil Unit
FCV – Fan Coil Unit, For Vrf Systems
FD – Fire Damper
FOR – Fuel Oil Return
FOS – Fuel Oil Supply
FOV – Fuel Oil Vent
FP – Fire Protection
FPM – Feet Per Minute
FR – Filter Rack
FT – Feet
FT – Hd Feet Of Head
FTR – Fin Tube Radiation
G – Gas
GA – Gauge
GAL – Gallons
GALV – Galvanized
GC -Condensate Piping – Gravity Drainage
GF – Glycol Feeder
GLR – Ground/Geothermal Loop Return
GLS – Ground/Geothermal Loop Supply
GPM – Gallons Per Minute
HC – Heating Coil
HDG – Heavy Duty Grille
HG – Refrigerant Hot Gas
HHR – Heating Hot Water Return
HHS – Heating Hot Water Supply
HLS – High Limit Switch
HP – Horsepower
HPR – Heat Pump Loop Retur
HPS – Heat Pump Loop Supply
HPU – Heat Pump Air Handling Unit, Air Or Water Source
HPW -Water to Water Heat Pump Unit
HVAC – Heating/Ventilating/Air Conditioning
HWP – Heating Hot Water Pump
CIVIL ACRONYMS
A.A.S.H.T.O – American Association of State Highway Transport
A.B – Anchor Bolt Or Asbestos Board
A.C.I – American Concrete Institute.
A.R.E.A – American Railway Engineering Association.
A.S.C – Allowable Stress of Concrete.
A.S.T.M – American Society for Testing Materials
AC – Asphalt Concrete
AE – Assistant Engineer
APM – Assistant Project Manager
B.M – Benchmark
B.M – Bending Moment.
B.O.F – Bottom Of Foundation
BHK – Bedroom, Hall, Kitchen
BLK – Block Work
BOQ – Bill Of Quantities
BRW – Brick Retaining Wall
BWK – Brick Work
C.I.Pipe – Cast Iron Pipe.
C.I.Sheet – Corrugated Iron Sheet.
CBW – Concrete Block Wall
CC – Cement Concrete.
CC – Centre To Centre
CE – Chief Engineer
CIP – Cast In Place
CJ – Construction Joint
CL – Centre Line
CMU – Concrete Masonry Unit
CP – Cement Plaster.
CPM – Critical Path Method.
CRW – Concrete Retaining Wall
CS – Comparative Statement.
D – Diameter
D.L – Dead load.
Dia – Diameter
DIM – Dimension
DL – Development Length
DPC – Damp Proof Course.
DPR – Daily Progress Report
DRG – Drawings
DWLS – Dowels
E.L – Environmental load.
EGL – Existing Ground Level.
EJ – Expansion Joint
EL – Existing Load
ELCB – Earth Leak Circuit Breaker
F.M – Fineness Modulus.
FGL – Formation Ground Level.
FL – Floor Level
FOC – Factor Of Safety
Ft – Foot Or Feet
GL – Ground Level
GP – Ground Plane.
HAC – High Alumina Cement
HFL – Highest Flood Level.
HP – Horizontal Plane.
IOM – Inter Office Memo
ISI – Indian Standard Institute.
JE – Junior Engineer
JST – Joist
Kg – Kilogram.
L.L – Live load.
LC – Lime Concrete.
LW – Light Weight
LWC – Light Weight Concrete
M – Meter
MB – Measurement Book.
MCB – Miniature Circuit Breaker
MEP – Mechanical Electrical Plumbing
MFL – Maximum Flood Level
MM – Millimeter.
MRC – Material Receipt Challan
MT – Metric Tonnes
N – Newton
NCF – Neat Cement Finishing.
OGL – Original Ground Level .
OPC – Ordinary Portland Cement
OSR – Open Soace Reservation Area
PC – Pile Cap
PC – Precast Concrete
PCC – Plain Cement Concrete
PERT – Programme Evaluation and Review Technique.
PL – Plinth level.
PM – Project Manager
PO – Purchase Order
PPE – Personal Protective Equipment
PPR – Poly Propylene Random.
PSF – Pound Per Square Foot
PSI – Pound Per Square Inch
PVC – Polyvinyl Chloride
PWD – Permanent Works Engineer
QC – Quality Control
QS – Quantity Surveyor
R.B.W – Reinforced Brick Work.
RBC – Reinforced Brick Concrete.
RC – Reinforced Concrete
RCC – Reinforced Cement Concrete
RL – Reduced level.
RMC – Ready Mixed Concrete Concrete.
SCC – Self Compacting Concrete
SRC – Sulphate Resisting Cement
STP – Sewage Treatment Plant
SWG – Standard Wire Gauge.
TB – Tie Beam
TBM – Tunnel Boring Machine
TDS – Total Dissolved Solids
TMT – Thermo Mechanical Treatment
TOB – Top Of Beam
TOC – Top Of Concrete
TOW – Top Of Wall
U.S.C – Ultimate Stress of Concrete.
UPVC – Unplasticized Polyvinyl Chloride.
USD – Ultimate Strength Design.
VP – Vertical Plane.
W.C – Water Closet.
W.S.D – Working Stress Design.
WL – Working Level
WO – Work Order
ELECTRICAL ACRONYMS
AC – Alternating Current
DC – Direct Current
V – Volts
A – Ampere
M – Motor
E – Earth`
A/C – Air Conditioner
TP – Triple Pole
DP – Double Pole
LA – Light Arrester
KA – Kilo Ampere
LV – Low Volt
HV – High Volt
kV – Kilovolt
MV – Megavolt
HP – Horse Power
HT – High Tension
LT – Low Tension
kVA – Kilovolt Ampere
ISO – Isolator
NVC – No Volt Coil
OLR – Overload Relay
OLP – Overload Protection
SS – Salter Switch
TS – ThermoSwitch
TR – Transformer
PT – Pressure Transmitter
DPT – Differential Pressure Transmitter
FT – Flow Transmitter
LT – Level Transmitter
PCC – Power Control Centre
MCC – Motor Control Centre
RCCB – Residual Current Circuit Breaker
MPCB – Motor Protection Circuit Breaker
MCB – Miniature Circuit Breaker
MCCB – Molded Case Circuit Breaker
ACB – Air Circuit Breaker
VCB – Vacuum Circuit Breaker
OCB – Oil Circuit Breaker
PLC – Programmable Logic Controller
DCS – Distributed Control System
HMI – Human Machine Interface
RIO – Remote Input Output
RTU – Remote Terminal Unit
DOL – Direct Online
EOCR – Electronic Over Current Relay
ELCB – Earth Leakage Circuit Breaker
HRC – High Rupture Capacity Fuse
UPS – Uninterrupted Power Supply
JB – Junction Box
TB – Terminal Block
LCS – Local Control Station
CT – Current Transformer
PT – Potential Transformer
XLPE – Cross Linked Polyethylene
SWA – Single Wire Armoured
PVC – Polyvinyl Chloride
PTFE – Poly Tetra Fluoro Ethylene
FRLS – Fire Resistance Low Smoke
EPR – Ethylene Propylene Rubber
HPMV – High Pressure Mercury Vapor Lamp
HPSV – High Pressure Sodium Vapor Lamp
SCIM – Squirrel Cage Induction Motor
SRIM – Slip Ring Induction Motor
OLTC – On Load Tap Changer
NO – Normally Opened
NC – Normally Closed
RTD – Resistance Temperature Detector
BS – British Standards
RPM – Revolution Per Minute
LDB – Lighting Distribution Board
PDB – Power Distribution Board
SLDB – Secondary Lighting Distribution Board
EMLDB- Emergency Lighting Distribution Board
MLDB – Main Lighting Distribution Board
ACDB – Alternating Current Distribution Board
MPDB – Main Power Distribution Board
ACVS – Air Conditioning and Ventilation System
ACSR – Aluminium Cable Steel Reinforced
HART – Highway Addressable Remote Transducer
PID – Proportional Integral and Derivative
SCADA – Supervisory Control and Data Acquisition
VVVF – Variable Voltage Variable Frequency
RCBO – Residual Current Circuit Breaker with Overcurrent Protection
ACSR – Aluminum Conductor Steel Reinforced
AH – Ampere Hour Capacity of Batteries
AVR – Automatic Voltage Regulator
AWA – Aluminum Wire Armor
B – Electrical Susceptance
BAR – Pressure in Atmosphere
BIL – Breakdown Insulation Level
BS – British Standard Institutions
BTU – British Thermal Unit
C – Electrical Capacitance
CACA- Totally Enclosed Air Circuit, Air Cooled
CACW- Totally Enclosed Air Circuit, Water Cooled
CAD – Computer Aided Design
CB – Circuit Breaker
CBCU- Circuit Breaker Control Unit
CCR – Central Control Room
CEGB – Central Electricity Generating Board (UK)
CENELEC- European Committee for Electrotechnical Standardization
COR CU – Corrugated Copper
CSA – Cross Sectional Area
CSI – Current Source Inverter
CSP – Chlorosulphonated Polyethylene
CT – Current Transformer
CU – Un-tinned Copper
CUWB- Copper Wire Braid
db (A) – Measurement Unit of Sounds Decibels
DCS – Distributed Control System
DE – Drive end of a shaft
deg C – Thermal Temperature in Degrees Celsius
deg F – Thermal Temperature in Degrees Fahrenheit
deg K – Thermal Temperature in Degrees Kelvin
DMS – Data Management System
DMT – Definite Minimum Time
DOL – Direct Online Starter (Induction Motor)
DWR – Divided Winding Rotor Synchronous Generator
ECHA – Equipment Certified for Hazardous Areas
EEC – European Economic Community
EEMVA – The Engineering Equipment and The Materials User Association
EHV – Extra High Voltage
EIEMA – The Electrical Installation Equipment Manufacture’s Association
ELV – Extra Low Voltage (less than 50v)
EMA – Ethylene Methyl Acrylate
EMC – Electromagnetic Compatibility
EMI – Electromagnetic Interference
EMF – Electromotive Force
EPDM – Ethylene Propylene Diene Monomer
EPR – Ethylene Propylene Rubber
ERA – Electrical Research Association
ERM – Electronic Restart Module
ESD – Emergency Shutdown
ESP – Electric Submersible Pump
EX () – Certification Symbol for Hazardous Area Equipment
EWS – Engineering Work Station
PTL – Pin Type Cable Lug
FBA – Factory Built Assemblies
FCU – Feeder Control Unit
F&G – Fire and Gas
FEED – Front End Engineering and Design of a Project
FREQ – Frequency (HZ)
FAT – Factory Acceptance Testing
CG – Cable Glands
FLEX – Flexible used for Cables
G – Electrical Conductance, or Grounding
GCB – Gas Circuit Breaker
GCP – Generator Control Panel
GIS – Gas Insulated Switchgear or Substation
GOR – Gas to Oil Ratio Oil Well Fluids
GRP – Glass Reinforced Plastic
GSWA- Galvanized Steel Wire Armour
GSWB – Galvanized Steel Wire Braid
GTG – Gas Turbine Generator
GTO – Gate Turn Off Thyristor
HCL – Hydrogen Chloride, Gas or Acid
CT – Cable Tray
HOFR- Heat and Oil Resisting, Flame Retardant
HVAC – Heating Ventilation and Air Conditioning
HZ – Frequency in Cycles per Second, or Hertz
TPS – Thermal Power Station
IAC – Alternating Current
IALA – International Association of Lighthouse Authorities
ICI – Imperial Chemical Industries
IDC – Direct Current
IDMT – Inverse Definite Minimum Time
IEC – International Electrotechnical Commission
IEE – The Institution of Electrical Engineers of UK
IEEE – The Institute of Electronic and Electrical Engineers of USA
I/O – Input or Output Signals or Quantity
IMO – International Maritime Organization
IMCS – Integrated Motor Control System
IMS – Information Management System
INST – Instantaneous Quantity
INT – Intermittent Quantity
IP – Institute of Petroleum
IR – Insulation Resistance
IS – Intrinsically Safe Signal, Circuit or Equipment
IS/IN – Ratio of Starting Current to Running Current
ISO – International Standards Organization
J – Energy Joules or Newton-Metres
J – Current Density, Amps/mm2
kA – Kilo Ampere
KEMA – Short Circuit Testing Authority in the Netherland
kg – Kilogram
km – Length in Kilometers
kph – Kilometres per Hour
I/O – Input or Output Signals or Quantity
kV – Kilovolts
kVA – Kilovolt Amperes
kVAr – Reactive Kilovolt Amperes
kW – Kilowatts
L – Electrical Inductance in Henries
L – Line or Local Control Operation
LAN – Local Area Network
LBS – Weight of a Substance in Pounds
LDS – Low Density Foam
LED – Light Emitting Diode
LEL – Lower Explosive Limit
LF – Low Frequency
LHS – Left Hand Side
LMS – Load Management System
LSS – Load Shedding System
LSF – Low Smoke and Fumes, Applied to Cables and Wires
LSLH – Low Smoke and Halogen
LEL – Lower Explosive Limit
LSR – Load Sharing System
LV – Low Voltage
L1, L2, L3, N – Notation For Line and Neutral Voltages and Currents
LUX – Level of Illumination
LEL – Lower Explosive Limit
m – Length or Dimension in Metres, or Month
mA – Current in milliamperes
M – Manual operation
mBAR – millibar
MB – High Pressure Mercury, without Phosphor Coating
MBF – High Pressure Mercury, with Phosphor Coating
MBFR – High Pressure Mercury, with Phosphor Coating Internal Reflector
MBI – High Pressure Discharge with Metallic Halides
MBIF – High Pressure Discharge with Metallic Halides, with Phosphor Coating
MBR – Double ended Linear Arc Tube
MBTF – Combination of MBF Lamp and a Filament Lamp
MCC – Motor Control Centre
MCF – Switch-start Lamp, also used for Tabular Fluorescent Lamps in General
MCFE – Start less Lamp, Coated with Silicone
MCFA – Start less Lamp, with Earth Strip, mainly used in cold environments.
MBIF – High Pressure Discharge with Metallic Halides, with Phosphor Coating
MCR – Maximum Continuous Rating
MCU – Motor Control Unit
MHO – Unit of Electrical Admittance
MIC – Maximum Ignition Current
MICC – Mineral Insulated Calendar Cable
MIMIC- Mimic Display Panel
MMF – Magnetomotive Force
MMSCF – Million Standard Cubic Feet of a Cubic
MT – Mica Glass Tape
MTTR – Mean Time to Repair
MV – Medium Voltage
mV – Voltage in millivolts
MVA – Megavolt Amperes
MVAr – Reactive Megavolt Amperes
MW – Megawatts
NACE – National Association of Corrosion Engineers (USA)
NBR – Nitrile Butadiene Rubber
NC-N/C – Normally Closed Switching Device
NDE – Non Drive End of a Shaft
MCFE – Startless Lamp, Coated with Silicone
NEMA – The National Electrical Manufacturers Association
NEC – National Electrical Code (USA)
NER – Neutral Earth Resistor
NFPA – National Fire Protection Association
NO-N/O- Normally Open Switching Device
NPT – National Pipe Threads (USA)
NS – used to describe a type of Variable Speed AC Motor
NTS – Not to Scale
OC-O/C- Overcurrent or Open Circuit
OF-O/F- Over Frequency
OFAF – Forced Circulation of Internal Liquid, Forced Heat Exchange to Air
OFAN – Forced Circulation of Internal Liquid, Natural Heat to Air
OHL – Over Headline
OHMS – Unit of Electrical Resistance or Impedance
OIM – Offshore Installation Manager
OL-O/L – Over Load
ONAF – Naturally Circulated Internal Liquid, Forced Heat Exchange to Air
ONAN – Naturally Circulated Internal Liquid, Natural Heat to Air
OSHA – Occupational Health and Safety Administration (USA)
OV-O/V- Over Voltage
P – W – Power or Watts
PCC – Point of Common Connection
PVC – Polyvinyl Chloride
PVDF – Polyvinylidene Fluoride
PTP-PET- Polyethylene Terephthalate
PWM – Pulse Width Modulation
QA – Quality Assurance
QC – Quality Control
R – Electrical Resistance
RAM – Random Access Memory
RCU – Remote Control Unit
RHS – Right Hand Side
RMS – Root Mean Square
ROM – Read Only Memory
RTU – Remote Transmitter Unit
SF6 – Sulphur Hexafluoride
STG – Steam Turbine Generator
SWA – Steel Wire Armour
SWBD – Switch Board
SWGR – Switch Gear
TDRM – Time Delayed Restart Relay
TG – Turbo Generator, Gas or Steam
TCP – Gas Turbine Control Panel
TPRL – Total Plant Running Load
UPS – Uninterrupted Power Supply Unit
UV – Under Voltage
TNEB – Tamil Nau Electric Board
A-Ampere
AB Switch- Air Break Switch
AC-Alternating Current
ACCB- Air Case Circuit Breaker
ACDB-Alternating Current Distribution Board
AFC-Automated Frequency Control
AFC-Available Fault Current
AFCI-Arc Fault Circuit Interrupter
AH-Ampere Hour
AHU-Air Handling Unit
AIC-Ampere Interrupting Capacity
APFC-Automatic Power Factor Control
ATS-Automatic Transfer Switch
BLDC-Brushless DC
BLDM-Brushless DC Motor
CT-Current Transformer
DB-Distribution Board
DC-Direct Current
DCDB-Direct Current Distribution Board
DO Fuse- Drop Out Fuse
DOL-Direct ON Line
DP-Double Pole
DPIC – Double Pole Iron Clad
EHT-Extra High Tension
ELCB-Earth Leakage Circuit Breaker
FBT-Fly back Transformer
GFCI-Ground Fault Circuit Interrupter
GFI-Ground Fault Interrupter
GIS-Gas Insulated Switchgear
GO-Gang Operated
HT-High Tension
ICDB-Iron Clad Distribution Board
IMC-Intermediate Metal Conduit
IPMSM-Interior Permanent Magnet Synchronous Motor
LA-Lightning Arrester
LOPT-Line Output Transformer
LPS-Lightning Protection System
LRA-Locked Rotor Amperes
LT-Low Tension
LVDT-Linear Variable Differential Transformer
MCB-Miniature Circuit Breaker
MCC-Motor Control Center Panel
MCCB-Molded Case Circuit Breaker
MCP-Motor Circuit Protection
NC-Normally Closed
NCT-Neutral Current Transformer
NO-Normally Open
ONCT- On-circuit Tap Changer
OLTC- On-load Tap Changer
PB-Push Button
PCC-Power Control Centre Panel
PDP-Power Distribution Panel
PT-Potential Transformer
RCBO-Residual Current Circuit Breaker with Overload Protection
RCCB-Residual Current Circuit Breaker
RFID-Radio Frequency Identification
RLA-Rated Load Amperes
RMC-Rigid Metal Conduit
RMG-Ring Main Gear
RMU-Ring Main Unit
RNC-Rigid Non Metallic Conduit
RPR-Reverse Power Relay
SB -Switch Board
SCIM -Squirrel Cage Induction Motor
SFU – Switch Fuse Unit
SPDT- Single Pole Double Throw
SPST – Single Pole Single Throw
SSR-Solid State Relay
ST-Super Tension
SWG-Standard Wire Gauge
TMCB – Thermal Magnetic Circuit Breaker
TPIC – Triple Pole Iron Clad
TPS – Triple Pole Switch
TRS – Tough Rubber Sheathed
UART – Universal Asynchronous Receiver and Transmitter
UDS – Uniform Drawing System
UG-Under Ground
USART -Universal Synchronous and Asynchronous Receiver and Transmitter
VCB -Vacuum Circuit Breaker
VFD-Variable Frequency Drive
XLPE – Cross linked Polyethylene
BIM ACRONYMS
2D – Two Dimensional
3D – Three Dimensional
4D – Four Dimensional
A/E – Architect/Engineer
AEC – Architecture, Engineering, and Construction, or Architecture, Engineering, and Contracting
AECOO – Architects, Engineers, Constructors, Owners, and Operators
BAS – Building Automation System
BEA – Building Energy Analysis
BEM – Building Energy Model
BEMP – Building Energy Modeling Professional
BEP – BIM Execution Plan
BESA – Building Energy Simulation Analyst
BIM – Building Information Model, Building Information Modeling, and Building Information Management
CAD – Computer Aided Besign
CAFM – Computer Aided Facility Management
CFR – Central Facility Repository
CIFE – Center for Integrated Facility Engineering
CMa – Construction Manager as Agent
CMc – Construction Manager as Contractor
CMMS – Computerized Maintenance Management System
COBie – Construction Operations Building Information Exchange
GSA – General Services Administration
HVAC – Heating, Ventilation, and Air Conditioning
IAI – International Alliance for Interoperability
IDM – Information Delivery Manual
IFC – Industry Foundation Classes
IPD – Integrated Project Delivery
LOD – Level of Detail and Level of Development
MEP/FP – Mechanical, Electrical, Plumbing, and Fire Protection
MVD – Model View Definition
NBIMS US – National BIM Standard-United States
NBSAP – National Business Space Assignment Policy
NIBS – National Institute for Building Sciences
NIST – National Institute of Standards and Technology
O&M – Operations and Maintenance
OCA – Office of the Chief Architect
ODC – Office of Design and Construction
P100 – Facilities Standards for the Public Buildings Service
PBS – Public Buildings Service
POR – Program of Requirements
SBU – Sensitive but Unclassified
SDM – Spatial Data Management
SI – International System of Units
SOW – Statement of Work or Scope of Work
SPie – Specifiers’ Properties Information Exchange
SPV – Spatial Program Validation
VDC – Virtual Design and Construction
OIR – Organisational information requirements
PIR – Project information requirements
AIR – Asset information requirements
SIR – Security information requirements
EIR – Exchange information requirements/Employer’s information requirements
LOI – level of information
PLQ – Plain language questions
PLUMBING ACRONYM
A – Alarm
A – Anchor
ABS – Acrylonitrile Butadiene Styrene
ACCUM – Accumulator
AD – Area Drain
AFC – Automatic Flow Control
AFF – Above Finished Floor
AHR – Air Hose Reel
AHU – Air Handling Unit
AL – Aluminum
ALT – Alternate
AP – Access Panel
AS – Air Separator
Asb – Asbestos (Gaskets)
ASSY – Assembly
B – Beveled
B&S – Bell and Spigot
BB – Bolted Bonnet
BBE – Bevel Both Ends
BBL – Barrel (s)
BC – Bolt Circle
BD – Blow Down
BDD – Backdraft / Pressure Relief Damper
Bdr – Bleed ring
BE – Beveled End (s)
BF – Blind Flange
Bfy – Butterfly (valve)
BL – Battery Limits
Bld – Blind (flange)
Bld – Spectacle blind (plate between flanges)
BLE – Bevel Large End
Blk – Black (pipe)
BOE – Bevel One End
BOM – Bill of Materials
BOP – Bottom of Pipe
Brz – Bronze (valve)
BSE – Bevel Small End
BTU – British Thermal Unit
BV – Ball Valve
BV – Balance Valve
BW – Butt-weld
C – Compression
CB – Catch Basin
Ch. Op. – Chain Operator
Chk – Check (valve)
CHKV – Check Valve
CL – Centerline
CO – Clean Out
CONC – Concentric
COND – Condensate
CONN – Connection
CONV – Hydronic Convector
CORR – Corrosion
Cpl – Coupling
CPLG – Coupling
CPVC – Chlorinated Polyvinyl Chloride
CPVC – Chlorinated Polyvinyl Chloride
CS – Carbon Steel
CS – Cast Steel
Csg – Casing
Csw – Concentric swage
CTRLV – Control Valve
CTS – Copper Tube Size
CUH – Cabinet Unit Heater
CW – Chain Wheel / Cold Water
CWO – Chain Wheel Operator
CWP – Cold Water Pressure
CWR – Cooling Water Return
CWS – Cooling Water Supply
D&W – Doped and wrapped (pipe)
DA – Directional Anchor
DB – Dry Bulb
DES – Double extra strong
DF – Drinking Fountain
DF – Drain Funnel
DFT – Dry film thickness
DI – Ductile iron
DIA – Diameter
DIFF – Diffuser
DIM – Dimension
DISCH – Discharge
DR – Drain
DRWN – Drawn
DS – Downspout
DSAW – Double sub‐merged arc welded (pipe)
DW – Dummy Weld
DWG – Drawing
Dwg # – Drawing number
DWV – Drain/Waste/Vent
DWV – Drainage waste & vent
DXC – Direct Expansion Cooling Coil
EA – Exhaust Air
EAF – Electric arc furnace
EAT – Entering Air Temperature
EBBR – Electric Base Board Radiation
EC – Electrical Contractor
ECC – Eccentric
ECONV – Electric Convector
ECUH – Electric Cabinet unit Heater
EF – Exhaust Fan
EG – Exhaust Grille
ELEV – Elevation
ELL – Elbow
Eol – Elbolet
EOM – End Of Main Drip
EQUIP – Equipment
ERW – Electric resistance weld (pipe)
Esw – Eccentric swage
ET – Expansion Tank
EUE – External upset ends
EWC – Electric Water Cooler
EWH – Electric Water Heater
Ex.hvy – Extra Heavy
Ex.stg – Extra Strong
EXCH – Exchanger
EXIST – Existing
Exp jt – Expansion joint
EXTG, E – Existing
F&D Faced and drilled (flanged)
F/F – Face of flange
F/F – Face-to-Face
FA – Flow Alarm
FAB – Fabricate/fabricator
FAS – Free along side
FBO – Furnished By Others
FD – Floor Drain
FD – Fire Damper
FDN – Foundation
FE – Flanged ends
FE – Flow Element
Fem – Female (ends)
FF – Flat Face
FF – Full face
FHT – Female hose threads
FI – Flow Indicator
FIC – Flow Indicating Controller
Fig – Figure (number)
FIP – Female iron pipe
FL – Flange
FLD – FAB Field Fabricate
Flex – Flexitallic (gasket brand name)
Flg. – Flange
Flgd – Flanged ends
FLR – Floor
FNPT – Female National Pipe Thread Taper
FOB – Flat on Bottom
FOB – Free On Board
FOT – Flat on Top
FR – Flow Recorder
FRC – Flow Recording Controller
FS – Forged Steel
FS – Field Support
FS – Forged Steel
FSD – Flat Side Down
FSD – Combination Fire/Smoke Damper
FSU – Flat Side Up
Ft – Feet/Foot
Ftg – Fitting
FTR – Hydronic Finned Tube Radiation
FUE – Female Union End
FW – Field Weld
FW – Fire Water
G – Gauge or Gage
Gal – Gallon
Galv – Galvanized
GaV – Gate Valve
GC – General Contractor
GCO – Grade Cleanouts
GEN – General
GG – Gauge glass
GJ – Ground Joint (union)
Glb – Globe (valve)
GPD – Gallon Per Day
GPF – Gallons per Flush
GPH – Gallons Per Hour
GPM – Gallons Per Minute
GPR – Gas Pressure Regulator
GR – Grade
GRS – Gas Regulator Station
Gsk – Gasket
GT – Grease Trap
GVTR – Gas Vent through Roof
HC – Hose Coupling
Hdr – Header
Hex -Six‐Sided Head, Bolt, Plug etc.
HN – Heat Number
HT – Hose Threads
Hvy – Heavy
HW – Hot Water
HCV – Hand Control Valve
HIC – Hand Indicating Controller
HLL – High Liquid Level
HOR – Horizontal
HP – High Pressure
HPFS – High Point Finished Surface
HPP – High Point Paving
HR – Hanger Rod
HR – Hour
HTR – Heater
HVAC – Heating, Ventilating, and Air Conditioning
HYD – Hydraulic
HAZ – Heat-Affected Zone
HSLA – High-Strength, Low-Alloy
HIC – Hydrogen-Induced Cracking
H – Hub
HB – Hose Bibb
HTG – Heating
H&CW – Hot and Cold Water
HD – Hub Drain
HDPE – High Density Polyethylene
Hex – Heat Exchanger
HG – Mercury
HP – Horsepower
HWCP – Hot Water Circulating Pump
HYD – Hydrant
HZ – Hertz
IBBM – Iron Body Bronze Mounted (valve)
ID – Inside Diameter
IPS – Iron Pipe Size
IS&Y – Inside Screw & Yoke (valve)
ISO – Isometric (drawing)
IUE – Internal Upset Ends
IA – Instrument Air
IA – Insulation (anti sweat)
IC – Insulation (cold)
ID – Inside Diameter
IDD – Inside Depth of Dish
IET – Electric Trace
IGT – Glycol Trace
IH – Insulation (heat conservation)
IN – Inch(es)
INS – Insulate or Insulation
INST – Instrumentation
INV – Invert Elevation
IPS – Iron Pipe Size
IS – Insulation Safety
ISA – Instrumentation Society of America
ISO – International Organization for Standardization
ISO – Isometric (drawing)
IST – Steam Trace
IE – Invert Elevation
INV – Invert
IPC – International Plumbing Code
IPS – Iron Pipe Size
INV. EL – Invert Elevation
JCT – Junction
Jkscr – Jack Screw
JT – joint(s)
JW – Jacket Water
L – Level
L/MIN – Liters Per Minute
L/S – Liters Per Second
LA – Level Alarm
LAH – Level Alarm-High
LAL – Level Alarm-Low
LAT – Leaving Air Temperature
Lat – Lateral
LAV Lavatory
Lb (s). # Pound (s) # Symbol for Pounds
LBS – Pounds
LC – Level Controller
LC – Lock Closed
LG – Level Gauge
LG – Level Glass
Lg – Length, long, level gauge
LI – Level Indicator
LIC – Level Indicating Controller
Lin Ft – Linear Feet
LJ – Lap Joint (flange)
LLC – Liquid Level Controller
LLL – Low Liquid Level
LN – Line
LNG – Liquid Natural Gas
LO – Lock Open
LOL – Latrolet
LP – Line Pipe
LP – Low Pressure
LPG – Liquefied Petroleum Gas
LPT – Low Point
LR – Long Radius
LR – Level Recorder
LRC – Level Recording Controller
LS – Level Switch
M – One thousand
M – Meter
M&F – Male and Female (ends)
MAT’L – Materials
MATL – Material
MAX – Maximum
MBH – 1000 BTU/HOUR
MC – Mechanical Contractor
MECH – Mechanical
MFD – Mechanical Flow Diagram
MFG – Manufacturing
Mfg – Manufacturer
MFR – Manufacturer
MG/L – Milligram Per Liter
MH – Manhole
MHT – Male Hose Threads
MI – Malleable Iron
MIN – Minimum
MIN – Minute
MIP – Male Pipe Threads
MIP – Male Iron Pipe
Misc – Miscellaneous
MISC – Miscellaneous
MK – Piece Mark
Mk – Mark (spool piece)
ML – Milliter
MM – Millimeter
MPT – Male Pipe Threads
MRR – Materials Receiving Report
MS – MOP Sink
MSS – Manufacturers Standards Society of the Valve and Fittings Industry
MTO – Material Take‐Off (from drawings)
MTR – Mill Test Report
MUV – Automatic Make-Up Valve
MW – Miter Weld
MW – Manway
N – North
N2 – Nitrogen
NC – Normally Closed
NDT – Nondestructive Testing
NEC – National Electric Code
NEG – Negative
NF – Oil Free Dry (Nitrogen)
NIC – Not In Contract
Nip – Nipple (pipe)
NIP – Nipple
NLL – Normal Liquid Level
NO – Normally Open
NO – Number
No – or # Number
NOM – Nominal
NOZZ – Nozzle
NPS – Nominal Pipe Size
NPSH – Net Positive Suction Head
NPT – National Pipe Thread
NTS – Not to Scale
NU – Non‐Upset (ends)
O2 – Oxygen
OA – Outside Air
OAL – Overall Length
OBD – Opposed Blade Damper
OC – On Center
OD – Outside Diameter
OEM – Original Equipment Manufacturer
OFD – Overflow Drain
OH – Open Hearth
OPP – Opposite
Orf – Orifice
OS&D – Over Short & Damage (report)
OS&Y – Outside Screw and Yoke (valve)
OS&Y – Outside Screw and Yoke
OSD – Open Sight Drain
OSD – Open Site Drain
OVHD – Overhead
OWS – Oily Water Sewer
OXY – Oxygen
Oz – Ounce
P&ID – Piping and Instrumentation Diagram
PA – Pipe Anchor
PA – Pressure Alarm
PBE – Plain Both Ends
Pc – Piece (mark for spool pieces)
PC – Pressure Controller
PCV – Pressure Control Valve
Pdl – Paddle (a blind plate between flanges)
PdRC – Pressure Differential Recording Controller
PE – Plain Ends
PE – Plain End
PI – Pressure Indicator (valves & gauge assembly)
PI – Point of Intersection
PI – Pressure Indicator
PIC – Pressure Indicating Controller
PLE – Plain Large End
PLE – Plain Large End
Plt – Plat (steel)
PO – Pump Out
PO # – Purchase Order Number
POC – Point of Connection
POE – Plain One End
POS – Positive
PP – Polypropylene
PP – Personnel Protection
Pr – Pair
PR – Pressure Regulator
PR – Pressure Recorder
PRC – Pressure Recording Controller
Press – Pressure
PRV – Pressure Reducing Valve
PS – Pipe Support
PSE – Plain Small End
PSI – Pounds per Square Inch
PSIA – Pounds per Square Inch Absolute
psig – Pounds‐Force Square Inch, Gauge
PSIG – Pounds Per Square Inch Gage
PSV – Pressure Safety (relief) Valve
PSV – Pressure Safety Valve
PT – Point
PTFE – Polytetrafluoroethylene (aka Teflon)
PVC – Polyvinyl Chloride
PVF – Pipe, Valves and Fittings
PW – Potable Water
Qty – Quantity
QUAD – Quadrant
QUAD – Quadruple
R – Radius
RA – Return Air
Rad – Radius
RCNP – Reinforced Concrete Pipe
RCP – Radiant Ceiling Heating Panel
RD – Roof Drain
REC’D – Received
Rec’d – Received (materials)
Recirc – Recirculating
Red – Reducer
RED – Reducer
REINF – Reinforce
REQ’D – Required
Req’d – Required (materials)
Reqn – Requisition
Reqn – Requisition
REV – Revision
REV – Reverse
RF – Raised Face
RG – Return Grille
RIV – Roof Intake Vent
RJ – Ring Type Joint
RO – Reverse Osmosis
RPM – Revolutions Per Minute
RPM – Rotations Per Minute
RPZ – Reduced Pressure Backflow Preventer
RR – Red Rubber (gasket type)
RR – Return Register
RRV – Roof Relief Vent
RS – Rising Stem (valve)
RS – Rising Stem
RTD – Resistance Temperature Detectors
RTE – Reducing Tee
Rtg – Rating
RTJ – Ring Type Joint (flange facing)
RTRP – Reinforced Thermosetting Resin Pipe
S – Slip or Socket
S – South
S/40 – Schedule 40 (of pipe or fittings)
S/80 – Schedule 80 (of pipe or fittings)
SC – Sample Connections
Sch – Schedule (of pipe or fittings)
Scrd – Screwed (ends)
Sdl – Saddle (pipe)
SDR – Standard Dimension Ratio
SE – Screwed Ends
SECT – Section
SH – (SHT) Sheet
SK – Sink
Skt Bld – Skillet Blind (plate between flanges)
Smls – Seamless Spec
SMLS – Seamless
SO – Slip‐On (flange)
SO – Steam Out
SOL – Sockolet
SP – Set Point
SP GR – Specific Gravity
SP/SPG – Spigot
SPEC – Specification
Spl Sht – Spool Sheet (from isometric drawing)
Sq – Square (inches, feet, yards etc.)
SR – Supply Register
SR – Short Radius, Stress Relieve
SRL – Short Radius Ell
SS – Stainless Steel
STD – Standard (a pipe or fitting schedule)
STHX – Shell and Tube Heat Exchanger
Stl – Steel
Stm – Steam
Sub – Short Length of Pipe or Rod
SUCT – Suction
SUPT – Support
SW – Socket Weld
Swg – Swage Nipple
SWP – Safe Working Pressure
SWP – Standard Working Pressure
SYS – System
T – Steam Trap
T&C – Thread and Coupled
T&G – Tongue and Groove (flange facing)
T/T – Tangent to Tangent
TA – Temperature Alarm
Tan – Tangent
TBE – Thread Both Ends
Tbg -Tubing
TC – Temperature Controller
TCV – Temperature Control Valve
TE – Threaded End
TEMP – Temperature
Thk – Thick
Thr’d – Threaded
THRD – Thread
TI – Temperature Indicator
TIC – Temperature Indicating Controller
TLE – Thread Large End
TO – Transfer Opening
TOC – Top of Concrete
TOE – Thread One End
TOG – Top of Grout
TOL – Threadolet
TOS – Top of Steel
TP – Trap Primer Line
TPI – Threads Per Inch
TR – Temperature Recorder
TRC – Temperature Recording Controller
TSE – Thread Small End
TW – Thermometer Well
TW – Temperature Well
TW – Thermowell
Typ – Typical (repeat the same item)
UA – Utility Air
ULF – Ultra Low Flush
Un – Union
UR – Urinal
US – Utility Station
VA – Valve
VA – Vent to Atmosphere
Vac – Vacuum
VAV – Variable Air Volume
VB – Vortex Breaker
VC – Vitrified Clay
VCP – Vitrified Clay Volume
VERT – Vertical
VF – Vent to Flare
VFD – Variable Frequency Drive
Vol – Volume
VS – Vent to Stack
VS – Vent Stack
VTR – Vent Thru Roof
W – West
WB – Welded Bonnet
WB – Wet BUB
WC – Water closet (toilet)
Wd – Width/Wide
WE – Weld End
WH – Wall Hydrant
WI – Wrought Iron
WLD – Weld
WN – Weld Neck (flange)
WOG – Water / Oil / Gas (pressure rating)
WOL – Weldolet
WP – Working Pressure
WS – Waste Stack
WT – Wall Thickness/weight
XR – X‐Ray (at pipe welds)
FIRE ACRONYM
AGL – Above Ground Level
AHJ – Authority Having Jurisdiction
BC – Battalion Chief
FD – Fire Department or Fire District
IAP – Incident Action Plan
ICS – Incident Command System
IFSAC – International Fire Service Accreditation Congress
IMS – Incident Management System
ISFSI – International Society of Fire Service Instructors
NFA – National Fire Academy
NFC – National Fire Codes
NFFF – National Fallen Firefighters Foundation
NFIRS – National Fire Incident Reporting System
DFR – Doors – Fire Resisting
SCD – Self Closing Devices
FRC – Fire Resisting Construction
FRG – Fire Resisting Glazing
FRG/H – Fire Resisting Glazing Height above the Floor Level
FEHR – Fire Extinguishers – Hose Reel
FEW – Fire Extinguishers – Water
FEF – Fire Extinguishers – Foam
FEDP – Fire Extinguishers – Dry Powder
FECD – Fire Extinguishers – Carbon Dioxide
FEVL – Fire Extinguishers – Vaporizing Liquid
FEFB – Fire Extinguishers – Fire Blanket
FA – Fire Alarm
FAAWD – Fire Alarm – Audible Warning Device
VWD – Visual Warning Device
IT – Internal Telephone
IP – Indicator Panel
MS – Manual Sounders
DH – Automatic Fire Alarm Heat
DS – Automatic Fire Alarm – Smoke
ELP – Emergency Lighting Points
EL-LEB – Emergency Lighting – Illuminated Exit Box
LDEB – Illuminated Directional Exit Box
FES – Fire Exit Sign
FEDS – Fire Exit Directional Sign
FN-GN – Fire Notice – General Notice
FN-SN – Fire Notice – Staff Notice
FNKDSN – Fire Notice – Keep Door Shut Notice
FN-SON – Fire Notice – Slide to Open Notice
FN-EKCN – Fire Notice – Fire Exit Keep Clear Notice
GRL – Guardrail Balustrade or Wall
ASP – Automatic Sprinkler Points
APPS – Area Protected by a Pressurization System
HL – Hazard Location
GENERAL ACRONYM