459INJURY FREQUENCY RATE = (Number of Injuries) 1,000,000
Number of hours worked per year
DETENTION TIME (hrs) = Volume of Basin (gals) X 24 hrs
Flow (GPD)
BY-PASS WATER (gpd) = Total Flow (GPD) X Plant Effluent Hardness (gpg)
Filtered Hardness (gpg)
HARDNESS
HARDNESS (mg/L as CaCO 3 ) = A (mls of titrant) X 1000
Mls of Sample
Ca HARDNESS as mg/L CaCo 3 = 2.5 X (Ca, mg/L)
Mg HARDNESS as mg/L CaCo 3 = 4.12 (Mg, mg/L)
ALKALINITY TOTAL = Mls of Titrant X Normality X 50,000
(mg/L) Mls of Sample
EXCHANGE CAPACITY (grains) = Resin Volume (cu. ft) X Removal Capacity
HARDNESS TO GRAIN/GALLON = Hardness (mg/L) X gr./gal
17.1 mg/L
LANGELIER INDEX = pH - pHs
CHEMICAL ADDITION
CHEMICAL FEED RATE = Chemical Feed (ml/min)
(gpm) 3785 ml/gal
CHLORINE DOSE (mg/L) = Chlorine Demand (mg/L) + Chlorine Residual (mg/L)
POLYMER % = Dry Polymer (lbs.)
Dry Polymer (lbs.) + Water (lbs.)
DESIRED PAC = Volume (MG) X Dose (mg/L) X 8.34
(lbs./MG) 1 MG
PAC (lbs./gal) = PAC (mg/L) X 3.785 (1/gallon)
1000 (mg/g) X 454 (g/lb.)