2025 Nelsen Corporation Catalog - Catalog - Page 442
17 Dealkalizer Sizing Information
Technical & Engineering
NOTICE: A complete water analysis is required before a quote can be processed.
Customer to provide the following info.
Applications for Chloride Anion Dealkalizers :
Companion Equipment:
Softened water is passed through the dealkalizer reducing
free carbon dioxide, bicarbonate alkalinity, and sulfates,
and replacing these with an equivalent amount of chlorides.
The resulting water keeps boiler and process equipment
clean and scale free and also solves the problems of
excessive boiler alkalinity and corrosive Condensate. Savings
are obtained by lowering boiler blow-down requirement
and virtually eliminating condensate line corrosion due
to carbon dioxide.
It is advisable to feed a dealkalizer with softened waler.
The hardness ions in the feed water can combine with the
sulfate ions attracted to the anion resin and form an insoluble
calcium sulfate precipitate. This scale will tend to foul the
dealkalizer over time as it accumulates on the resin bed. If
this occurs, an acid regeneration may help to dissolve the
scale and clean the bed.
Complete these calculations to determine size:
Location Notes:
1. Determine Total Anion Loading:
Available Space:
Anions
Symbol
as ions
factor
as CaCO3
Room Width
Ft
In
Room Height
Ft
In
Room Length
Ft
In
Door Width
Ft
In
Hydroxide Alkalinity
OH
x 2.94 =
Carbonate Alkalinity
CO3
x 1.67 =
Bicarbonate Alkalinity
HCO3
x 0.82 =
Sulfates
SO4
x 1.04 =
Nitrates
NO3
x 0.81 =
Feed Water Pipe Size
In
Carbon Dioxide
CO2
x 1.14 =
Raw Water Hardness
gpg
Chlorides
Cl
x 1.41 =
Gallons per Day Required
Total Exchangable Anions =
Water Softener Capacity
Kgr
÷ 17.1
Anions as grains per gallon =
2. Determine Resin Capacity (Percent Alkalinity) =
5.0
0
50
0
m
pp
I
S
T
pm
0
25
In
TD
p
@ flowrate of 2 GPM
per cu. ft. to 10%
alkalinity end point
17.2
11.5
5.7
20% 40% 60% 80% 100%
PERCENT ALKALINITY OF INFLUENT WATER
17 - 22
7.5
5.0
S
pm
0
u
nfl
22.9
I
TD
17.2
p
25
11.5
2.5
@ flowrate of 2 GPM
per cu. ft. to 10%
alkalinity end point
0
5.7
20% 40% 60% 80% 100%
PERCENT ALKALINITY OF INFLUENT WATER
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OPERATING CAPACITY GRAMS CaCO3 PER LITER
DS
2.5
nt
e
flu
u
nfl
t
en
en
t
t
en
7.5
10.0
flu
22.9
28.8
In
10.0
12.5
34.4
Capacity for
Dealkalization @
5 lbs NaCl and
0.25 lbs. NaOH
per cu. ft.
Co-current
regeneration
TD
S
28.8
15.0
pp
m
Capacity for Dealkalization
@ 5 lbs NaCl per cu. ft.
Co-current regeneration
30 inch Bed Depth
These charts illustrate
the operating capacity
of the anion exchange
resin when regenerated
with 5 lbs. of sodium
chloride (salt) per cubic
foot and approximately
0.25 lbs. per cubic foot
of rayon grade sodium
hydroxide (caustic).
Addition of caustic to
the regenerant solution
will increase the resin
capacity for alkalinity
and CO2 due to a more
efficient exchange
with hydroxide
ions as compared
to chloride ions.
50
0
12.5
34.4
OPERATING CAPACITY Kgr PER CU. FT. AS CaCO3
15.0
OPERATING CAPACITY GRAMS CaCO3 PER LITER
OPERATING CAPACITY Kgr PER CU. FT. AS CaCO3
Total Alkalinty (OH + CO3 + HCO3) Divided by Total Exchangeable Anions
