How to Size a DELTA Water Softener
1. DETERMINE HOURLY FLOWRATE.
Daily flow divided by number of operating hours, or Kg’s of steam less condensate return.
2. SELECT SOFTENER FROM CHART BASED ON HOURLY FLOWRATE.
3. CALCULATE LITRES BETWEEN REGENERATIONS.
Softener capacity (ppm/m3) ÷ Hardness (PPM) = Volume (M3) between regenerations.
5. CHECK NUMBER OF REGENERATIONS PER DAY.
Delta softeners may regenerate up to three times per day. Twice per day is preferred.
EXAMPLE:
A small package boiler makes 500kg of steam per hour, for 8 hours per day, water hardness is 50ppm.
At 500 litres per hour, from the catalogue choose the DHSO100M softener.
150ppm/m³ ÷ 50ppm = 3m³ between regenerations
3m³ = 3,000 litres ÷ 500 litres per hr = 6 hours per regeneration
= once per day
| Softener | Max Flowrate (Litres/Hr) | Capacity (ppm/m³) | Min Op Range (ppm) | Max Op Range (ppm) |
| DHSO100M | 1500 | 150 | 150 | 600 |
| Onega 1x9L | 2000 | 400 | 200 | 600 |
| DHSO200M | 2600 | 150×2 | 150 | 600 |
| Onega 2 x9L | 3500 | 400 x2 | 200 | 600 |
| Arenal 1x12L | 2100 | 600 | 200 | 600 |
| Ontario 2 | 3700 | 1200* (2 x 12L in parallel) | 200 | 600 |
| Ontario 2 x N | 3700 x N | 1200 x N (N units in parallel) | 200 | 600 |