MECHANICAL CONTRACTORS ASSOCIATION OF AMERICA, INC.
Glossary and Abbreviations
Abbreviations
Definition
ABS
Acrylonitrile Butadiene Styrene
Automatic buttweld
Adaptor
Air Conditioning Refrigeration Tubing
Adjustable
Acid exhaust
Above Finished Floor (reference to dimensions)
Aluminum
Argon
Arsine
Analyzer Transmitter
Automatic Temperature Control
Atmospheric Vent
Acid Vent
Acid Waste
Acid waste neutralization
Air, Water and Gas
American Welding Society
American Water Works Association
Bell & Spigot
Diborane
Balance
Bead and Crevice Free
Boron Trichloride
Blow Down
Beveled End
Butterfly
Boron Trifluoride
Back Flow Preventer
Bottom of duct
Back Pressure
Bronze
British Thermal Unit
Bushing
Buttweld
Cup
Halocarbon 116 -- hexafluoroethane
Halocarbon 134a -- 1,1,1,2-tetrafluoroethane
Halocarbon 125 -- pentafluoroethane
Halocarbon 218 -- perfluoropropane
Halocarbon c-318 -- octafluorocyclobutane
Compressed Air
ABW
Adapt.
ACR
Adj.
AEX
AFF
Alum.
AR
ASH3
AT
ATC
ATV
AV
AW
AWN
AWG
AWS
AWWA
B&S
B2H6
Bal.
BCF
BCL3
BD
BE
Bf.
BF3
BFP
BOD
BP
BR
BTU
Bush.
BW
C
C2F6
C2H2F4
C2HF5
C3F8
C4F8
CA
©MCAA 2005
Revision 3
MECHANICAL CONTRACTORS ASSOCIATION OF AMERICA, INC.
Glossary and Abbreviations
Abbreviations
Definition
CDA
CEX
CF4
CFM
Clean Dry Air
Corrosive Exhaust
Halocarbon 14 -- Tetrafluoromethane
Cubic Feet Per Minute
Halocarbon 32 -- Difluoromethane
Halocarbon 41 -- Methyl Fluoride
Methane
Halocarbon 23 -- Trifluoromethane
Cast Iron
Clean in Place
Check
Class
Chlorinated Water
Chlorine Gas
Control
Carbon Monoxide
Clean-Out
Carbon Dioxide
Coaxial Double Contained Tubing
Combination
Compression
Concentric
Connection
Corporation
Corrugated
Coupling
Chlorinated Poly Vinyl Chloride
Cryogenic
Clean Steam (white steam)
Carbon Steel
Center
Chemical Valve Manifold Box
Cold Water
Double
Diesel Fuel
Drinking Fountain
Double Hub
Deionized
Ductile Iron
Deionized Water
Diameter Inch
Diaphragm
CH2F2
CH3F
CH4
CHF3
CI
CIP
CK
Cl.
CL
CL2
Cntrl.
CO
CO
CO2
COAX
Combo.
Comp.
Conc.
Conn.
Corp.
Corrug.
Coup.
CPVC
CRYO
CS
CS
Ctr.
CVMB
CW
Dbl.
DF
DF
DH
DI
DI
DI WTR
Dia.
Diaphr.
©MCAA 2005
Revision 3
MECHANICAL CONTRACTORS ASSOCIATION OF AMERICA, INC.
Glossary and Abbreviations
Abbreviations
Definition
Diff.
Dir.
Disch.
Dn.
Drng.
FV
Ga.
Diffuser
Direct
Discharge
Down
Drainage
Dry Vacuum Cleaning
Chilled Drinking Water Recirculating
Chilled Drinking Water Supply
Drainage, Waste and Vent
Ecentric
Equipment Cooling Water
Electric
Elbow
Electropolished
Expansion
External
Float & Thermostatic
Flux Cored Arc Welding
Floor Drain
Flow Element
Type of Fluoropolymer Tubing and Fittings for a Wide Range of Uses.
Ferrule
Flammable Exhaust
Figure
Female Iron Pipe
Flow Indicating Transmitter
Flexible
Flange/ Flanged
Fuel Oil Return
Fuel Oil Supply
Fuel Oil Vent
Female Pipe Thread
Floor Sink
Flow Switch
Foot
Flow Transmitter
Fitting
Flush Valve
Gage
gal.
GEH4
GEX
Gallon
Germane
General exhaust
DVC
DWR
DWS
DWV
Ecc.
ECW
Elec.
Ell.
EP
Exp.
Ext.
F&T
FCAW
FD
FE
FEP
Ferr.
FEX
Fig.
FIP
FIT
Flex.
Flg. Flgd.
FOR
FOS
FOV
FPT
FS
FS
ft.
FT
Ftg.
©MCAA 2005
Revision 3
MECHANICAL CONTRACTORS ASSOCIATION OF AMERICA, INC.
Glossary and Abbreviations
Abbreviations
Definition
GMAW
Gas Metal Arc Welding
Good Manufacturing Practices
Gallons Per Minute
Grooved
Gasket
Grease Trap
Gas Tungsten Arc Welding
Gasoline Vent
Hydrogen
Sulfuric acid
Hydrogen bromide
Hydrogen chloride or hydrochloric acid if liquid
Helium
Heat exhaust
Hexagon
Hydrofluoric acid
Gas-High Pressure
House Nitrogen (usually coming off of bulk storage tanks)
Handle
Horizontal
Horse Power
High Purity
Ultra High Purity
High purity nitrogen (usually bottle gas dedicated to service)
House Vacuum
Heating Ventilating and Air Conditioning
Hot Water
Hot Water Recalculating
Heat Exchanger
Hydraulic
Invert Elevation
Instrument air
Iron Body Bronze Mounted
Industrial Cold Water
Industrial Hot Water
Inside Diameter
Industrial Hot Water
Inch
Increaser
Indicator
Invert
(Isopropyl alcohol) Solvent used in cleaning piping
GMP
GPM
Grvd.
Gskt.
GT
GTAW
GV
H2
H2SO4
HBR
HCL
HE
HEX
Hex.
HF
HG
HN2
Hndl.
Horiz.
HP
HP
UHP
HPN2
HV
HVAC
HW
HWR
HX
Hyd.
IE
IA
IBBM
ICW
IHW
ID
IHW
in.
Incr.
Indic.
Inv.
IPA
©MCAA 2005
Revision 3
MECHANICAL CONTRACTORS ASSOCIATION OF AMERICA, INC.
Glossary and Abbreviations
Abbreviations
Definition
IPS
Iron Pipe Size
Industrial Waste
Industrial Waste Neutralization
Joint
Laboratory Compressed Air
Lateral
Lavatory
Pound/ Pounds
Pounds Per Hour
Level Element
Liquid
Level Indicating Transmitter
Lubricating Oil
Lubricating Oil Vent
Liquid Oxygen
Lawn Sprinkler Supply
Level Transmitter
Lubricated
Laboratory Vacuum
Level
Medical Compressed Air
Manual
Medical gases -- Vac, air, O2, N20
Gas-Medium Pressure
Malleable Iron
Male Iron Pipe
Mechanical Joint
Molybdemium
Male Pipe Thread
Mounted
Multiple
Medical Vacuum
Nitrogen
Nitrogen
Nitrous oxide
Normally Closed
Neon
Neoprene
Nitrogen Trifluoride
Natural Gas
No Hub
Ammonia
IW
IWN
Jnt.
LA
Lat.
Lav.
lb. lbs.
Lb/Hr.
LE
Liq.
LIT
LO
LOV
LOX
LS
LT
Lubr.
LV
Lvl.
MA
Man
MED GAS
MG
MI
MIP
MJ
Moly.
MPT
Mtd.
Multi
MV
N
N2
N2O
NC
NE
Neo
NF3
NG
NH
NH3
©MCAA 2005
Revision 3
MECHANICAL CONTRACTORS ASSOCIATION OF AMERICA, INC.
Glossary and Abbreviations
Abbreviations
Definition
NLG
NO
NO
NPT
NPW
NRS
Non-Leaded Gasoline
Nitric Oxide
Normally Open
National Pipe Thread
Non Potable Water
Non Rising Stem
Oxygen
Outside Diameter
Oil Free Air
Operator or Operated
Welding with Orbital Welding Machine
Orifice
Outside Screw & Yoke
Oxygen
Process Cooling Water
Pumped Discharge Line
Plain End
Cross-Linked Polyethylene
Type of fluoropolymer tubing and fittings for a wide range of uses
Fluoropolymer tubing and fittings for a wide range of uses. Many Options
available for different processes
Premium Gasoline
Phosphine
Pressure Indicator
Used to clean interior surface of piping, by blowing a saturated IPA nonparticulate paper through the inside of tubing. Repeat process until WAD
comes out clean
Pressure Indicating Transmitter
Post Indicator Valve
Push Joint
Pure Nitrogen (usually bottle gas dedicated to service)
High Purity Nitrogen (usually bottle gas dedicated to service)
Pneumatic
Positive
Pressure Relief & Temperature Relief Valve
Pressure
Pressure Relief or Reducing Valve
Pounds Per Square Inch
Pressure Transmitter
Type of fluoropolymer tubing and fittings for a wide range of uses
O2
OD
OFA
Oper.
OW
Orif.
OS&Y
OX
PCW
PD
PE
PEX
PFA
PFA / PTFE / FEP
PG
PH3
PI
PIG / WAD
PIT
PIV
PJ
PN2
PN2 / HPN2
Pneu.
Pos.
PR & TRV
Pres.
PRV
PSI
PT
PTFE
PV / PVAC
PVC
PVDF
©MCAA 2005
Process Vacuum
Poly Vinyl Chloride
Polyvinylidene Fluoride
Revision 3
MECHANICAL CONTRACTORS ASSOCIATION OF AMERICA, INC.
Glossary and Abbreviations
Abbreviations
Definition
PW
RA
RD
Red.
Reg.
Purified Water
Unit used to measure surface roughness
Roof Drain
Reducing
Regulator
Regular Gasoline
Roof Leader
Round
Reverse Osmosis
Rising Stem
Soil
Sink
Sanitary
Submerged Arc Welding
Steam condensate
Schedule
Screwed
Scrubbed Exhaust
Storm Drain, Rainwater Drain
Standard Dimensional Ratio
Sulfur Hexafluoride
Safety
Shower
Single Hub
Silicon tetrachloride
Silicon tetrafluoride
Dichlorosilane
Silane
Trichlorosilane
Steam in Place
Slip-Joint
Solvent Exhaust
Shielded Metal Arc Welding
Slip On
Solenoid
Sock O Let
Automatic Fire Sprinkler
Spigot
Square
Sanitary Stack
Stainless Steel
RG
RL
Rnd.
RO
RS
S
S
SAN
SAW
SC
Sch.
Scrd.
SCX
SD
SDR
SF6
Sfty.
SH
SH
SICL4
SIF4
SIH2CL2
SIH4
SIHCL3
SIP
SJ
SLX
SMAW
SO
Sol.
SOL
SP
SPIG
sq.
SS
SS
©MCAA 2005
Revision 3
MECHANICAL CONTRACTORS ASSOCIATION OF AMERICA, INC.
Glossary and Abbreviations
Abbreviations
Definition
SST
Stainless steel / stainless steel tubing. Usually 304l or 316l grade
stainless
Sub-Soil Drain, Footing Drain
Storm
Street
Standard Weight
Steam
Strainer
Suction
Surgical Vacuum
Service Weight
Soft Water
Solvent waste
Socket Weld
Thermometer
Threaded & Coupled
Temperature Element
Tempered Hot Water
Tempered Hot Water, Recirculation
Process Equipment / Tool Gas Panel
Threaded
Thread O Let
Trap Primer
Traverse
Trap
Temperature Relief Valve
Temperature Transmitter
Thermal Well
Thermal Expansion
Typical
Ultra high purity
Utility nitrogen (usually coming off of bulk storage tanks)
Utility or house nitrogen usually coming off of bulk storage tanks
Ultra pure water
Urinal
Utility
Vacuum
Vacuum Vent
Variable Air Volume
Mechanical joining method
Vertical
Vibration
SSD
ST
St.
Std Wt
Stm.
Strnr.
Suct.
SV
SV
SW
SW
SW
T
T&C
TE
Temp. HW
Temp. HWR
TGP
Thd.
TOL
TP
Trav.
Trp.
TRV
TT
TW
TX
Typ.
UHP
UN2
UN2 / HN2
UPW
UR
UTIL
V
V Vent
VAV
VCR
Vert.
Vib.
©MCAA 2005
Revision 3
MECHANICAL CONTRACTORS ASSOCIATION OF AMERICA, INC.
Glossary and Abbreviations
Abbreviations
Definition
Vlv.
Valve
Valve manifold box. Usually contains multiple gas sticks
Volumn
Vent Thru Roof
Waste
With
Without
Water Closet
Weld End or Weight Element
Water for Injection
Wall Hydrant
Weld Neck
Waste Oil
Water Oil Gas
Weld O Let
Waste Oil Vent
Water - Potable
Weight
Weight Transmitter
Wet Vacuum Cleaning
By
Xenon
Extra Heavy
Extra Strong
Double Extra Heavy
Wye
One Reduction
Two Reduction
Three Reduction
50/50 Solder Joint
95/5 Solder Joint
VMB
Vol.
VTR
W
W/
W/O
WC
WE
WFI
WH
WN
WO
WOG
WOL
WOV
WP
Wt
WT
WVC
x
XE
XH
XS
XXH
Y
1-R
2-R
3-R
50/50
95/5
©MCAA 2005
Revision 3