ED system = 280 m3/d

ED system = 280 m3/d

1. Pump Motor Controls –

The ED system includes 22 centrifugal pumps; 14 pumps with

7.5 KW motors, 4 pumps with 15 KW motors and 4 pumps with 3.0 KW motors. Power for all motors is 415 VAC, 50 Hz, 3 phase. All 22 motors require Variable Frequency Drives.

2. Off-Skid Equipment & Piping -

a. Feed Balance/CIP Tank (T-1000) – 500 liter capacity, 316 SS sanitary

construction w/ CIP spray ball. Includes level transmitter and 50DN (2”) sanitary

level control valve.

b. Feed Booster Pump (P-1000) – Sanitary centrifugal, 18 m3/h water @ 2.0 bar

pressure.

c. Chemical Day Tanks (T1001 & 1002) – 25 liter capacity, plastic construction for

35% HCl and 50% NaOH. Include level controls and actuated valves to fill and

empty. These tanks are mounted above T-1000 such that chemicals gravity

feed.

d. Chemical Dosing Pumps –15 liters of 50% NaOH into to each CIP.

Dosing rate ~150 l/h. MP-1002 pumps ~20 liters of 35% HCl to each CIP.

Dose 35% HCl into the brine stream during ED processing at a rate of 15-35 l/h,

with dosing rate controlled by a 4-20 ma analogue signal. Maximum dosing rate

~150 l/h.

e. 3-way Divert Valves – Angle type, sanitary 3-way divert valve, 316 SS, DN50 (2”) size.

f. Local Control Panel – SS enclosure, typically mounted on tank to house

solenoids for the pneumatic actuated, off-skid valves.

g. Interconnecting piping & valves .

3. Control System, common to both ED lines:

a. PLC –

– Digital inputs (24 vdc) = 128 (approximate count)

- Digital outputs (24 vdc) = 128 (approximate count)

- Analog inputs (4-20 ma) = 64

- Analog outputs (4-20 ma) = 40

- Flow totalizer inputs = 6

- Analog control loops = 40

b. Operator Interface – Desktop PC, Pentium 4 – 3 MHz – I M byte Ram CD

drive, Hard disk, Keyboard, optical mouse, CD/DVD rewrite, USB port, network

card between PC and PLC, 19” LCD monitor, operative system Windows 2000

suitable for SCADA system application. Graphic software such as In-Touch to

create operator interface screens, alarm pages, analogue

controller pages, trends and pages for controlling plant sequence; start-up,

process, flush, CIP and shutdown.

4. Wiring & Cables:

- Between the PLC and the motor controls, DC drives and local junction

boxes on the ED skids.

- From the motor controls direct to pump motors.