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Tower Tonnage:
RR / 3
GPM RR:
Tower Tonnage × 3
VOLUME:
1.5 × sump or
5 × RR or
Evap C = RR × 1.83
CYCLES (COC):
Tower TDS / MU TDS
EVAP (E) gpm:
E = 1% × RR per 10 F
Make up (MU) gpm:
(Evap × COC) / (COC - 1)
Blow Down (BD) gpm:
E / (COC - 1)
Holding Time Index (HTI) Hrs:
0.693(V/BD)
CR = 3gpm / ton
E = 3gpm / 100 ton
((ppm / COC) / 120) × ((MU gpm × 1440) / 1000))
or
(ppm / 120) × (BD(gpm) x 1440) / 1000
slug:
(ppm / 120) × (Volume system / 1000)
Basic Calculations Necessary to Survive in the Field - Part I: Cooling Water
Guidelines for Treatment of Systems Containing Enhanced and Super Enhanced Tubes
Boiler Horsepower × 34.5 = # steam / hr
CYCLES (COC):
Boiler TDS / FW TDS
((ppm / COC) / 120) × (MU gpm × 1440 / 1000)
or
(ppm / 120) × (BD(gpm) x 1440) / 1000
BD: Blow Down
BW: Boiler Water
COC:Cycles of Concentration; Cycles
FW: Feed Water
MU: Make Up
Mmhos: millimhos
ppm: parts-per-million
Annual AVG Steam Load:
#/hr
Cycles of Concentration:
cycles
Hours/Day:
hours
Days/Year:
days
City Water Cost:
$/gal
MU Conductivity:
Mmhos
FW Conductivity:
Mmhos
Condensate Conductivity:
Mmhos
Operating Hours:
min/yr
MU Water Flow:
gpm
FW Flow:
gpm
BD Rate:
gpm
Annual MU:
gal
Annual BD:
gal
Actual % Condensate Return:
%
MM pounds per year:
MM lbs
Condensate Flow Rate:
gpm
Steam Flow:
gpm
Annual Water Costs:
$/yr
Basic Calculations Necessary to Survive in the Field - Part III: Boiler Water
Exchange Capacity:
30,000 gr/ft^{3} @ 15 lbs salt
Peak Flow Rate:
5 gpm/ft^{3} resin
17.1 ppm total hardness = 1 grain
Basic Calculations Necessary to Survive in the Field - Part 2: Pretreatment
Peak Flow Rate:
3 gpm/ft^{3} resin
Exchange Capacity:
10,000 gr/ft^{3} @ 5 lbs salt
Exchange Capacity:
13,000 gr/ft^{3} @ 5 lbs salt w/ NaOH
0.25 lbs NaOH per ft^{3} of resin
Other Anions
1ppm PO_{4}^{2-} | 1.58 ppm as CaCO_{3} |
1ppm SO_{4}^{2-} | 1.04 ppm as CaCO_{3} |
1ppm SiO_{2} | 0.83 ppm as CaCO_{3} |
1ppm NO_{3} | 0.81 ppm as CaCO_{3} |
1ppm Cl^{-} | 1.41 ppm as CaCO_{3} |
Basic Calculations Necessary to Survive in the Field - Part 1: Cooling Water
A tolerance of -0.3 to +0.3 is the ideal range for swimming pools
A tolerance of -0.5 to +0.5 is acceptable for swimming pools
A Saturation Index of higher than +0.5 indicates carbonate scale formation.
A Saturation Index of lower than -0.5 indicates corrosive water.
Dosage Required = (Volume of Water to be treated x PPM)/1,000,000
Pound Required = (Target ppm/120) x (Volume Water/1000)
Feed Factor = 100/Percent Solution (as percent)
Percent Solution = 100 X (Volume of Polymer/Total Solution Volume) (*Volumes must be in same units)
Percent Removal = ((influent - Effluent)/ Influent) x 100
This is used to calculate the removal efficiency for BOD, TOC, COD, TSS, FOG, etc
Floculant Make down
Day Tank addition Calculation
Floculant Volume Added = (Desired Flocculent Make Down Percent/100) x Day Tank Volume x unit desired conversion
© 2021 Association of Water Technologies
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