Operations and Maintenance Manual
E4H Series Water Purification Machine
13
1.5 Specifications for E-Series Machines
The machine flow specifications listed in Table 1.1 below are based on 77°F (25°C) and 2,000 ppm
NaCl.
Table 1. 1: Flow Specifications for E4H Machines, 50-75% Recovery
Model
E4H-16K
E4H-21K
E4H-27K
E4H-38K
E4H-43K
Units
gpm (m
3
/h)
gpm (m
3
/h)
gpm (m
3
/h)
gpm (m
3
/h)
gpm (m
3
/h)
Permeate Rate
11.2 (2.56)
15 (3.4)
18.8 (4.3)
26.2 (5.9)
30 (6.8)
Concentrate
Rate
11.2-3.7
(2.5-0.8)
15-5
(3.4-1.1)
18.8-6.3
(4.3-1.4)
26.2-8.7
(5.9-2.0)
30-10
(6.8-2.3)
Feed Rate
22.4-14.9
(5.1-3.4)
30-20
(6.8-4.5)
37.6-25.1
(8.5-5.7)
52.4-34.9
(11.9-7.9)
60-40
(13.6-9.1)
1.5.1 Feed Water Specifications
The feed water requirements stated in the following table must be met to ensure quality
permeate and extended membrane element life.
Table 1. 2: Feed Water Requirements
Temperature
Typical: 50-85°F (10-29°C)
Maximum: 32-104°F (0-40°C)
Inlet Pressure
Minimum 30 psig (2.1 bar)
Maximum 60 psig (4.1 bar)
Chlorine (continuous feed)
0 ppm
Operating pH
For soft water (less than 1 grain per gallon (gpg) or 17 mg/L hardness),
acceptable pH is 4.0-11.0.
For unsoftened water contact factory with water analysis, acceptable pH
is 5.5-6.0.
For short term (cleaning) a pH range of 2-12 is acceptable.
Silt Density Index (SDI)
Less than or equal to 3 to minimize membrane fouling and extend cleaning
intervals. Refer to ASTM standard D4189.
