Establish Concentrate, Electrode, And Dilute Flow - GE E-CELL STACK MK-2 Series Owner's Manual

9. Once water flows continuously through the Concentrate Bleed (no bubbles), prime the
Concentrate Pump (see pump manufacturer's instructions in Vendor Data).

8.2.2 Establish Concentrate, Electrode, and Dilute Flow

1. Throttle Concentrate Inlet Valve, so that it is 10-20% open.
2. Confirm the Concentrate Pump Suction Valve is open.
3. Set the Concentrate Pump Discharge Valve 25% open.
4. Close the Concentrate Bypass Valve.
5. Confirm Concentrate Make Up Valve is open.
6. "Bump" the Concentrate Pump by quickly turning the hand-switch to "Hand" and back to
"Off" (If the pump does not operate, check that the disconnect switch on the rectifier is in the
"ON" position). Confirm the pump rotation, if incorrect, a qualified electrician should swap
two of the leads to change the pump rotation.
7. Start the Concentrate Pump by switching it to "Hand".
8. Open the Concentrate Pump Discharge Valve 100%.
9. Open the Concentrate Bleed Valve to attain approximately 10% of Product flow.
10. Slowly adjust the Concentrate Inlet Valve until the Concentrate Inlet is at least 5 psi (0.35 bar)
less than the Dilute Feed pressure.
If the Concentrate Outlet pressure is zero open the Concentrate Bypass Valve in order to
increase it above zero.
If the Concentrate By-Pass Valve is closed and the Concentrate Outlet pressure is too high
(i.e. Cout Pressure is greater than or equal to Dout Pressure) slowly close the Concentrate
Make-Up Valve. The Concentrate Outlet pressure will start to decrease. Once it is at least 5
psi (0.35 bar) less than the Dilute Outlet pressure, stop and check the inlet pressures. The
Concentrate Inlet pressure is probably too low. Correct this by opening the Concentrate Inlet
Valve. Continue to make small adjustments to the Concentrate Make-Up and Concentrate
Inlet Valves, until the Concentrate stream is at least 5 psi (0.35 bar) less than the Dilute
stream. Ensure that Concentrate flow is within the correct range (see section "Operating
Instructions".) If it is not, continue to make small stepwise adjustments to Concentrate Inlet
and Concentrate Bypass valves until Concentrate pressures and flow are in the correct
ranges.
11. Open the Electrode Outlet Valve to achieve nominal 0.35 gpm/Stack (80 l/h).
12. Re-adjust Concentrate Inlet Valve again if the pressure difference between Concentrate and
Dilute Feed is not at least 5 psi (0.35 bar).
13. Set Concentrate Bleed Valve to achieve the required recovery.
calculated according to the recovery formula explained in the section "OPERATING
INSTRUCTIONS – Concentrate Bleed Stream."
Once Recovery is known Bleed Flow can be calculated from the definition of recovery given
by the formula in that section. Also, Bleed Flow is calculated by E-Calc.
Note: In conditions with very low Feed water pressures, it may be necessary to throttle the
Concentrate Pump Discharge Valve in order to achieve the required flows and pressures.
This is the reason for the diaphragm valve on the pump discharge.
rev.1.1
The recovery rate is
Page 8-14