I got a severe error on the FEHE type heat exchanger(HeatX) saying at least one feed has zero flow, and several warnings(two of them are on the heater/cooler), but the program actually runs without failing. Can anyone of you please tell me how I can fix this? Thx...


<< Run reinitialized 14:48:53 Sun Oct 9, 2011>>



->Processing input specifications ...

Flowsheet Analysis :

Block $OLVER01 (Method: WEGSTEIN) has been defined to converge
streams: HOT-OUT PRODUCT

COMPUTATION ORDER FOR THE FLOWSHEET:
H2-COMPR
$OLVER01 DE-H2 H2-MIXER COOLER DE-IC4 VALVE DE-C4 PUMP FEHE
| HEATER REQUIL
(RETURN $OLVER01)

->Calculations begin ...


Block: H2-COMPR Model: COMPR

> Beginning Convergence Loop $OLVER01 Method: WEGSTEIN

Block: DE-H2 Model: SEP
* WARNING
ZERO FEED TO THE BLOCK. BLOCK BYPASSED


Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER
* WARNING
ZERO FEED TO THE BLOCK. BLOCK BYPASSED


Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 1 3 10.583
2 9 30 6.3056
3 7 23 9.4089
4 7 21 13.050
5 7 20 11.547
6 7 16 6.8323
7 7 15 5.6925
8 7 15 5.8873
9 7 15 6.3693
10 7 15 6.8712
11 7 15 7.3596
12 7 15 7.8434
13 3 8 5.4502
14 3 6 1.0253
15 2 3 0.19315

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 1 4 45.463
2 9 28 17.238
3 7 17 17.689
4 7 16 18.584
5 7 15 19.868
6 7 17 21.880
7 7 18 22.883
8 7 20 27.056
9 7 21 35.455
10 7 25 41.402
11 7 22 15.888
12 3 9 10.287
13 3 8 2.4119
14 3 6 0.41960

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX
*** SEVERE ERROR
AT LEAST ONE FEED HAS ZERO FLOW
BLOCK BYPASSED


Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 1
* WARNING
THE VALUES FOR SOME VARIABLES ARE MISSING.
THIS MAY BE CAUSED BY A ZERO-FLOW STREAM.
THE PREVIOUS VALUES OF THE VARIABLES WILL BE USED.
THE MISSING VARIABLES ARE:
"7" THRU "8"

7 vars not converged, Max Err/Tol 0.10000E+07

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER
* WARNING
ZERO FEED TO THE BLOCK. BLOCK BYPASSED


Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 7 16 0.89699E-02

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 16 0.11771

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 2
15 vars not converged, Max Err/Tol 0.10000E+05

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 8 28 37.992
2 7 23 35.050
3 7 22 27.507
4 7 21 19.161
5 7 16 14.504
6 7 15 12.115
7 7 15 10.036
8 3 7 1.3718
9 3 6 0.20767

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 7 23 81.987
2 7 19 9.2160
3 7 17 8.4352
4 7 16 11.421
5 7 18 14.877
6 7 20 19.000
7 7 20 24.776
8 7 21 34.744
9 7 25 36.163
10 7 21 24.033
11 6 16 15.844
12 3 7 4.3019
13 3 7 0.83802

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 3
14 vars not converged, Max Err/Tol 0.57600E+05

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 6 16 0.63001

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 21 0.32533

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 4
14 vars not converged, Max Err/Tol 0.64757E+04

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 7 28 10.757
2 3 9 0.96529

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 9 35 36.429
2 7 27 27.157
3 6 18 16.395
4 3 8 2.7857
5 3 7 0.48220

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 5
13 vars not converged, Max Err/Tol -0.42142E+04

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 6 15 1.2684
2 3 6 0.55202E-01

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 25 0.25225

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 6
14 vars not converged, Max Err/Tol 0.40274E+04

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 6 17 2.3001
2 3 7 0.19253

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 7 32 10.421
2 3 5 1.5594
3 2 7 0.26836
* WARNING
OUTSIDE LOOP TOLERANCE WAS SATISFIED BUT DESIGN SPEC ITERATION
(MIDDLE LOOP) FAILED TO CONVERGE. REACHED AN OPTIMUM VALUE.


Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 7
14 vars not converged, Max Err/Tol 0.11308E+04

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 6 15 0.30265

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 6 21 0.42808E-01

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 8
11 vars not converged, Max Err/Tol 0.10500E+03

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 15 0.49092

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 20 2.4223
2 3 5 0.36630

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 9
9 vars not converged, Max Err/Tol 0.45199E+03

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 14 0.91625E-01

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 16 0.17420E-01

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 10
8 vars not converged, Max Err/Tol 0.39263E+03

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 15 0.50176

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 27 0.55459

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 11
8 vars not converged, Max Err/Tol -0.13473E+04

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 15 0.36437

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 17 0.32454E-01

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 12
8 vars not converged, Max Err/Tol 0.44809E+03

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 14 0.97947E-01

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 21 0.12906

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 13
7 vars not converged, Max Err/Tol 0.15786E+03

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 14 0.59383E-01

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 6 24 0.48934E-02

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 14
7 vars not converged, Max Err/Tol 0.27335E+02

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 13 0.16243E-01

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 16 0.32707E-01

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 15
3 vars not converged, Max Err/Tol 0.63369E+02

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 13 0.15274E-01

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 17 0.14096E-01

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 16
4 vars not converged, Max Err/Tol 0.66832E+02

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 13 0.16312E-01

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 17 0.17490E-01

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 17
4 vars not converged, Max Err/Tol 0.50455E+02

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 14 0.49274E-01

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 14 0.20288E-02

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 18
3 vars not converged, Max Err/Tol -0.11893E+03

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 14 0.32075E-01

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 4 13 0.13036E-02

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 19
2 vars not converged, Max Err/Tol 0.55888E+02

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 4 12 0.11832E-01

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 4 13 0.13709E-02

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 20
2 vars not converged, Max Err/Tol 0.21891E+02

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 13 0.91440E-02

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 4 13 0.57233E-03

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 21
2 vars not converged, Max Err/Tol 0.24032E+01

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 4 10 0.17236E-02

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 4 13 0.62750E-03

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 22
2 vars not converged, Max Err/Tol 0.10541E+02

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 4 10 0.25542E-02

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 4 13 0.74657E-03

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 23
2 vars not converged, Max Err/Tol 0.95605E+01

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 13 0.13595E-01

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 4 13 0.25164E-03

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 24
1 vars not converged, Max Err/Tol -0.40305E+02

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 4 12 0.10311E-01

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 4 13 0.41122E-03

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 25
1 vars not converged, Max Err/Tol 0.11389E+02

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 5 11 0.25501E-02

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 4 13 0.32869E-03

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 26
1 vars not converged, Max Err/Tol 0.41875E+01

Block: DE-H2 Model: SEP

Block: H2-MIXER Model: MIXER

Block: COOLER Model: HEATER

Block: DE-IC4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 4 10 0.16660E-02

Block: VALVE Model: VALVE

Block: DE-C4 Model: RADFRAC

Convergence iterations:
OL ML IL Err/Tol
1 4 13 0.34513E-03

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

Block: HEATER Model: HEATER

Block: REQUIL Model: REQUIL

> Loop $OLVER01 Method: WEGSTEIN Iteration 27
# Converged Max Err/Tol 0.74272E+00

->Generating block results ...

Block: PUMP Model: PUMP

Block: FEHE Model: HEATX

->Simulation calculations completed ...



*** No Warnings were issued during Input Translation ***


*** Summary of Simulation Errors ***

Physical
Property System Simulation
Terminal Errors 0 0 0
Severe Errors 0 0 1
Errors 0 0 0
Warnings 0 0 6

->Generating results ...