Veolia Orion II 2000, Operator'S Manual

Page: 84 / 95

OPERATORS MANUAL
ORION II
Orion II 500-10000 Operators Page 84 of 95
Manual Part no: DOMAON0100 Issue A April 2008
8.2 CORRECTED FLUX (CF) CALCULATION
CF is displayed on the HMI Reverse Osmosis screen and is also trended.
The calculation is as follows:
AP MA
QP
CF


TCF
FS
QP
4

 
 
4 026 . 0 35 . 0 TS TCF
  
 
AOP
PS PS
AP







2
2 1
 
4147
ROR 1
1
1
1
1








 
CS AOP
Where:
AOP
= Average Osmotic Pressure (bar) PS1 = RO Feed Pressure (bar)
AP = Average Operating Pressure (bar) PS2 = RO Conc. Pressure (bar)
CF = Corrected Flux (l/h.m
2
.bar) QP = Corrected Permeate Flow l/h
CS1
= RO Feed Conductivity

S/cm
TCF = Temperature Correction Factor
FS4 = RO Permeate Flow l/h TS4 = TK1 Temperature
o
C
MA = Membrane Area m
2
ROR
1
= RO% Recovery (0 to 100% = 0 to1.0).
AOP is used to estimate the average osmotic pressure and accounts for differences between service
and recycle operation where osmotic pressure can vary considerably and would otherwise affect the
CF calculation. A 24 hour delay timer ensures that any temporary / transient low flux values are
ignored by the system.
The calculation will automatically be suspended (with the last value being displayed) when the unit is
not in Service. The calculation will return zero when in Service if any of the following occur: -
The RO Recovery rate is equal to 1 to prevent “
divide by zero
” PLC failures.
Temperature Correction Fact
or is zero to prevent “
divide by zero
” PLC failures.
The selected Membrane Area is zero to prevent “
divide by zero
” PLC failures.
Average Operating Pressure is zero to prevent “
divide by zero
” PLC failures
The calculation will only resume once all of the above items are cleared and the RO has been in
service mode and the ystems start to divert water to the process.
When corrected flux falls to 90% of the initial value set by the user a warning is raised indicating that
RO cleaning is required. After chemical cleaning and continuous service for 1 hour, the new flux
value is stored. The Failure percentage (normally 10%) is configurable from the HMI (with
engineering access). A user with engineering level access can overwrite the initial flux value if
required.