CWT Unit Conversions & Constants
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21 Terms
1 ft³ of water is approximately how many gallons?
7.48 gal
1 grain/gal as CaCO3 equals how many ppm?
17.1 ppm
1 ppm as CaCO3 equals about how many grains/gal?
0.0585 gpg
How much does 1 gallon of water weigh approximately?
8.34 lb
Product lb/gal from specific gravity?
SG × 8.34
Example: SG 1.13 weighs about how much per gallon?
9.42 lb/gal
1 ton of cooling equals how many BTU/hr?
12,000 BTU/hr
1 ton of cooling equals how many BTU/min?
200 BTU/min
What does MGD mean?
Million gallons per day
What does gpm mean?
Gallons per minute
What does ppm mean in dilute water solutions?
Parts per million; approximately mg/L
What does ppb mean in dilute water solutions?
Parts per billion; approximately µg/L
What does mpy mean?
Mils per year
1 mil equals how many inches?
0.001 in
Atmospheric pressure is approximately how many psi?
14.7 psi
psia equals what relative to psig?
psig + 14.7
psig equals what relative to psia?
psia - 14.7
One grain weighs approximately how many grams?
0.0648 g
What is ΔT?
Temperature difference
What is °F range across a cooling tower?
Hot-water temp minus cold-water temp
What is cooling-tower approach?
Cold-water temp minus entering wet-bulb temp