Design calculation sheetProject no: Date: Sheet no.: 1 1 Computed by:

Subject: Checked by:

Water Softner Sizing Approved by:

(1) Required grain removal per Gallon(grain/gal)

Inlet Water Hardness = 350 ppm (Very Hard)Outlet Water Hardness = 50 ppm⌂ Hardness = 300 ppm1 grain per gallon = 17.1 ppm

Total grains per gallon = 17.55 grain / gal

(2) Water Usage per Day(gal/day)

Average Flow Rate = 21 gpmConversion = 60 min/hrOperating Hours per day = 24 hrs / day

Water Usage per Day = 30240 gals/day

(3) Required Exchange Capacity(grains/day)

Total grains per gallon = 17.55 grain / gal from (1)Water Usage per Day = 30240 gals/day from (2)

Required Exchange Capacity = 530712 gr / day

(4) Required Resin

Required Exchange Capacity (REC) = 530712 gr / day from (3)Days of operation / regeneration (N) = 1 dayResin Exchange Capacity (Cap) = 32000

Required Resin = 16.6 0.5

(5) Salt Consumption per Generation(lb)

Required Resin = 16.6 from (4)Salt Dosage = 15 lb/ft3 salt dosage

(ft3)

gr /ft3 of resin

ft3 of resin = m3

ft3

of

gr / gal=Δ ppm /17. 1

gr /day=grgal

×galday

gals/day=gpm×60×hrs /day

Resin=(REC×N/Cap)

Salt=(ResinCap×Salt Dosage )

Salt Consumption per Generation = 249 lbs = 113.2 kg

Design calculation sheet Project no.: Date: Sheet no.: 25 25 Computed by:

Subject Checked by:

Extract from ASPE, Chap 11 - Water Treatment, Conditioning, and Purification Approved by:

The following are extracts from ASPE Data Book, Volume 2, Chapter 11 - " Water Treatment,Conditioning, and Purification".

is a measure of the total calcium, magnesium, iron and other metallic elements thatcontribute to the "hard" feel of water. Carbonate, sulfate, and chloride salts of theseelements are responsible for most of the scaling deposited on pipe and boiler walls.Generally accepted practice limits the term "hardness" to include only calcium and

Often, Water is characterized in general terms by the amount of hardness as follows:

SoftModerateHardVery hard

Hardness:

magnesium. Hardness is usually expressed in terms of mg/L (ppm) as CaCO3.

0 - 75 mg/L (ppm) as CaCO3

76 - 150 mg/L (ppm) as CaCO3

151 - 300 mg/L (ppm) as CaCO3

> 300 mg/L (ppm) as CaCO3

of