Units and Abbreviations
Units
B Billion
barg 1 bar (gauge) = 14.5 psi
bbl Barrel (6.2898 barrels = 1 m3)
bpd Barrels per day
Bq/kg Bequerels per kilogram (measure of radioactivity)
Bstb Billion standard barrels
cm Centimetre
cm3Cubic centimetre
cm/year Centimetres per year
dB Decibel
dB (A) A weighted unit of sound intensity weighted in favour of frequencies audible to the human ear
dBht(species) A metric for estimating the behavioural effects of noise on marine species dB L AEQ Sound pressure level
dB re. 1 µPa Decibels relative to one micropascal
g Grams
ha Hectare
hr Hour
H s Significant wave height
Hz Hertz (Measure of frequency)
K One thousand (e.g. 500K = 500,000)
keV Kiloelectron volt (one thousand electron volts)
kg Kilograms
km Kilometre
kilometre
km² Square
kNm3Thousand cubic metre at normal conditions
kW Kilowatts
LC50Lethal Concentration 50. The concentration of a chemical which kills 50% of
a sample population.
l Litres
l/hr Litres per hour
m Metres
M Million
m TVD BRT Depth in Metres (True Vertical Depth) (Below the Rotary Table)
m/hour Metres per hour
second
per
m/s Metres
metres
m² Square
metres
m³ Cubic
m3/day Cubic metres per day
m3/hour Cubic metres per hour
barrels
mbbl Thousand
mbgl Meters below ground level
mbpd Thousand barrels per day
mbwd Thousand barrels of water per day
mbwpd Thousand barrels of water per day
Mbopd Thousand barrels of oil per day
µ Microns
µm Micrometers
µg Micrograms
µg/g Micrograms per gram
µg/m3Micrograms per cubic meter
µg/l Micrograms per litre
Pascal
µPa Micro
mg Milligrams
mg/l Milligrams per litre
mg/m3Milligrams per cubic metre
mg/Nm3Milligrams per cubic meter (at normal conditions) ml Millilitres
mm Millimetres
mm/day Millimetres per day
mm/hr Millimetres per hour
mm/month Millimetres per month
standard cubic feet
MMscf Million
standard
cubic feet per day
MMscfd Million
MMBtu Million British thermal units
standard cubic feet
MMscf Million
cubic feet per day
MMscfd Million
standard
MMstb Million standard barrels
second
m/s Metres
per
Mstb/day Thousand barrels per day
Mstbd Thousand barrels per day
MW Megawatt
pH -log
[H+] (Measure of acidity or alkalinity)
10
PM10Particulate matter measuring 10µm in diameter ppb Parts per billion
ppbv Parts per billion by volume
ppm Parts per million
ppmv Parts per million by volume
PSI Pounds per square inch
lb/MMscf Pounds of water per million standard cubic feet 1Q Quarter one (of year)
s Second
scf Standard cubic feet
scf/bbl Standard Cubic Feet per Barrel
Sm³ Standard cubic metres
Sm3/hr Standard cubic metres per hour
tonnes
ktonne Thousand
t Tonnes
t/day Metric tonnes per day
dollars
US$ US
US$M US dollars (Millions)
yr Year
“ Inches
% Percent
%v Percentage by volume
%w Percentage by weight
%ile Percentile
˚C Degrees
centigrade
~ Approximately
than
> Greater
+/- Plus/minus
than
< Less
