IPE-TM-510-14 — Nontypical Pump Spillback Hydraulics P9.8

1. Table of Contents 1

2. Purpose 1

3. Determine Pump Minimum Flow Protection Requirements 1

4. Normal Flow Below Pump Minimum Flow, Spillback with Control Valve 2

Adapted for Multiple Cases 3

5. Normal Flow Below Pump Minimum Flow, Spillback with Restriction Orifice 6

6. Normal Flow for Lowest Process Flow Case Below Pump Minimum Flow 13

7. Column Total Overhead Pump with Spillback 20

APPENDIX A 26

APPENIDX B 27

Other related Procedures for reference:

IPE-TM-510-12, “Typical Pump Spillback Circuits in P9.8 Hydraulics”
IPE-TM-510-13, “Typical Pump Spillback Circuits in NHP”
IPE-TM-510-15, “Nontypical Pump Spillback Circuits in NHP”

2. Purpose

This procedure demonstrates the proper method of setting up the uncommon hydraulic circuits in P9.8 for pump minimum flow protection. In the hydraulic tabulations, for all flow scenarios in all process cases, the pump head and system frictional losses between the upstream vessel and spillback/splitter node must be based on a flow no lower than the minimum continuous flow of the pump.

3. Determine Pump Minimum Flow Protection Requirements

Tool T-510-04, (see Appendix A and B for graphical decision trees) shall be used to determine whether a pump requires minimum flow protection. If the Design Engineer concludes that pump minimum flow protection is required, the tool will indicate the section number and procedure number that shall be used as a guide to ensure that the hydraulic circuits are set up properly. All the simulation and flow scenario factors are calculated in Tool “T-510-04 Factors and Spillback Requirements for P98 Hydraulics”. The only required input to the tool is the pump minimum flow, normal process flows and specific gravity.

4. Normal Flow Below Pump Minimum Flow, Spillback with Control Valve

This example involves a pump with a single discharge flow path and a single process case. At normal and design flow scenario, the process flow is below the minimum flow of the pump; the spillback flow control valve will be slightly open since some flow must spillback continuously. Reference Procedure IPE-TM-500-05, to determine if a control valve (because of the flexibility to adjust its opening if the system hydraulics change) in the spillback line is a better option than a restriction orifice. For the alternate flow scenario, the flow through the pump is at the pump minimum flow. The hydraulic circuit for the spillback shall address the full rangability of the spillback flow control valve. The normal flow scenario is equal to the amount of liquid spilling back at normal conditions and the alternate flow scenario is equal to the pump minimum flow. It shall be capable of passing the minimum continuous flow of the pump if the forward flow control valve ever closes (due to a localized instrument air failure, for example).

The Design Engineer shall adhere to the following (see Example 4 hydraulic tabulations):

A flow meter on the pump discharge and a spillback splitter shall be added to the circuit which contains the pump.

A spillback circuit shall be created. This circuit runs after the circuit which contains the pump. This circuit shall start at the spillback node, proceed through a control valve, and end at a nozzle on the vessel which provides suction to the pump. In column bottoms services, the spillback circuit can discharge into the reboiler inlet piping. In general, the spillback flow should not return to the suction piping immediately upstream of the pump.

The simulation, design flow scenario and alternate flow scenario factors for the piping are calculated by Tool T-510-04 and shall be applied accordingly. This forces the hydraulics program to apply the correct pump head and system frictional losses to all flow scenarios. This will also correctly calculate the valve coefficients (Cvs) of the forward flow control valve. For the net forward circuit, enter the normal, design and alternate flow scenario factors consistent with line 5. For the spillback circuit, the normal and alternate flow scenario should be set to 100%.

The Instrument Engineer shall include the alternate flow scenario on the sheet in the 616 Project Specification that corresponds to the forward flow control valve.

In the 616 Project Specification, the Instrument Engineer shall base the sizing of the spillback flow control valve on the alternate flow scenario.

The Instrument Engineer shall include the normal (100%) flow scenario on the sheet in the 616 Project Specification that corresponds to the spillback flow control valve.

Adapted for Multiple Cases

A situation may arise requiring this example to be adapted for multiple process cases. The Design Engineer shall adhere to the following:

Two hydraulic circuits (using Section 5 as a guide) shall be created. Each circuit shall be labeled “Case A Only” or “Case B Only”, as appropriate.

Two pump equipment numbers shall be provided. The “dummy” pump prevents an erroneous rated flow from being generated in the pump reports. The governing case circuit shall be run first, thereby selecting a pump and generating a pump curve. This pump curve shall then be entered manually into the “dummy” pump.

Two equipment numbers shall be provided for each control valve and flow element. To assist the Instrument Engineer, labels for these equipment numbers shall clearly indicate “Case A Only” or “Case B Only”, as appropriate.

Unique equipment numbers shall be provided for the piping segments between the suction vessel and spillback splitter for each circuit.

The simulation, design flow scenario and alternate flow scenario factors are calculated by Tool T-510-04 and shall be applied accordingly.

The Instrument Engineer shall adhere to the following:

The alternate flow scenario of the lowest process flow case shall be included on the sheet in the 616 Project Specification that corresponds to the forward flow control valve.

In the 616 Project Specification, the sizing of the spillback flow control valve shall be based on the alternate flow scenario of the lowest process flow case.

The normal (100%) flow scenario of the process flow case that governs the pump sizing shall be included on the sheet in the 616 Project Specification that corresponds to the spillback flow control valve.

From Tool T-510-04, :

Example 4 Hydraulics of Pump with Single Discharge Flow Path and Continuous Spillback through a Control Valve

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SINGLE DISCHARGE – CONTINUOUS S/B WITH CV without its written permission. EFID

Circuit 3: PP SPLITTER DIOLEFIN RECYCLE Case Design Case Alternate

Press 100.0% 110.0% 60.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

PROPYLENE-PROPANE SPLITTER 142 -6.60 106.6 -6.60 106.6 -6.60 106.6

Line 1 ‡ 3 3.3 0.03 0.08 113.2 0.08 113.2 0.08 113.2

Static Head 140 -31.18 113.1 -31.18 113.1 -31.18 113.1

PP SPLITTER DIOEFIN RECYCLE PUMPS *Gov* 3 -489.0 144.3 -489.0 144.3 -489.0 144.3

Pump head, feet 2189.0 2189.0 2189.0

Pump capacity, gpm 20 20 20

Flowing Specific Gravity 0.516

Operating Temperature, degF 60

Viscosity, cp 0.05

Line 3 ‡ 1.5 0.9 1.01 0.91 633.2 0.91 633.2 0.33 633.2

DIOLEFIN PUMP DISCHARGE FE(1703) 2 1.90 632.3 1.90 632.3 1.90 632.3

Line 4 ‡ 1.5 .21 1.01 0.21 630.4 0.21 630.4 0.21 630.4

SPILLBACK SPLIT 630.2 630.2 630.2

Line 5 1.5 1.2 0.57 0.70 630.2 0.84 630.2 0.25 630.2

PP SPLITTER DIOLEFIN RECIRC FE(1704) 2 1.98 629.5 2.40 629.4 0.71 630.0

Line 13 1.5 .21 0.57 0.12 627.5 0.14 627.0 0.04 629.2

PP SPLITTER DIOLEFIN RECIRC CV(1604) 59.40 627.4 83.92 626.8 27.84 629.2

Line 14 1.5 0.9 0.57 0.51 568.0 0.61 542.9 0.18 601.4

MIXER NODE: PP SPL DIOLEFIN RECYCLE/SHP 567.5 542.3 601.2

‡ (Flow%=116.3)(Design%=100.0)(Alt%=100.0)

Circuit 4: PP SPLITTER DIOLEFIN RECYCLE SPILLBACK Case Design Case Alternate

Press 100.0% .0% 100.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

SPILLBACK SPLIT 630.2 630.2

Line 8 (Flow%=16.3)(Alter%=713.5) 1.5 .77 0.13 0.10 630.2 1.56 630.2

DIOLEFIN RECYCLE SPILLBACK CV(1603) 507.80 630.1 503.94 628.6

Line 9 (Flow%=16.3)(Alter%=713.5) 1.5 .77 0.13 0.10 122.3 1.56 124.7

DIOLEFIN RECYCLE SPILLBACK RETURN 122.2 123.1

5. Normal Flow Below Pump Minimum Flow, Spillback with Restriction Orifice

This example involves a pump with a single discharge flow path and multiple process cases. At normal and design flow scenarios for both process cases, the net forward flow is below the minimum flow of the centrifugal pump; therefore, the minimum flow of the pump will spillback continuously. Reference Procedure IPE-TM-500-05, to determine if a restriction orifice (due to its lower cost) in the spillback line is a better option than a control valve. The restriction orifice sizing is generally left to the contractor. All flow scenarios for all process cases are set equal to the pump minimum flow plus the net forward flow.

This example assumes that the heat and weight balance does not include a stream number to model the pump minimum flow plus the net forward flow. If such a stream number is available in the heat and weight balance, set the design and alternate flow scenarios for lines 17 and 18 to 100%, and disregard this Procedure.

The Design Engineer shall adhere to the following (see Example 5 hydraulic tabulations):

A spillback splitter shall be added to the circuits which contain the pump.

A spillback circuit is not required.

Multiple circuits are required in order to show the pump minimum flow plus the net forward flow for each process case:
Two pump equipment numbers shall be provided. The “dummy” pump prevents an erroneous rated flow from being generated in the pump reports. The governing case circuit shall be run first, thereby selecting a pump and generating a pump curve. This pump curve shall then be entered manually into the “dummy” pump.
Two equipment numbers shall be provided for each control valve and flow element. To assist the Instrument Engineer, labels for these equipment numbers shall clearly indicate “Case A Only” or “Case B Only”, as appropriate.
Two line numbers shall be provided for the piping between the suction vessel and spillback node. Lines 1 and 101 shall have the same equivalent length and stream reference. The same shall apply to lines 3 and 103.
Each circuit shall be labeled “Case A Only” or “Case B Only”, as appropriate. In this example, circuits 6 and 7 each print twice. Note that circuit 6 only applies to Case A; therefore, the page corresponding to circuit 6 in Case B is erroneous data and shall be disregarded. Likewise, circuit 7 only applies to Case B; therefore, the page corresponding to circuit 7 in Case A is erroneous data and shall be disregarded.
Simulation stream factors need to be calculated and entered for the suction and discharge piping of the pump in order for the flow through the pump to equal the pump minimum flow plus the net forward flow. Different factors will be entered for lines 1 and 101 as well as 3 and 103 since the net forward flows are different for each process case. The design and alternate flow scenario factors shall be set to 100% for lines 1, 3, 101 and 103. This forces the hydraulics program to apply the correct pump head and system frictional losses to all flow scenarios. This will also correctly calculate the valve coefficients (Cvs) of the forward flow control valve. For the net forward circuit, enter the normal, design and alternate flow scenario factors for the circuit consistent with line 5.

There is a chance that hydraulics will pick a different pump type and, subsequently, a different minimum flow after the rated flow has been increased to pump minimum flow plus net forward flow. If this happens, manually enter the original pump minimum flow (calculated when the normal flow was only equal to the net forward flow) in hydraulics.

The Instrument Engineer shall include the alternate flow scenario of the lowest process flow case on the sheet in the 616 Project Specification that corresponds to the forward flow control valve.

For this case, Tool T-510-04, does not calculate the flow factors correctly. The tool assumes a control valve will be installed in the spillback line and will generate flow factors in order for the flow through the pump to be equal to the pump minimum flow. However, when a restriction orifice is used, the flow through the pump should be set equal to the pump minimum flow plus the net forward flow.

Pump Minimum Flow (gpm): 20

Case A net forward flow (gpm): 9.4

Case B net forward flow (gpm): 6.6

Case A Desired flow through pump (gpm): 20+9.4

Case B Desired flow through pump (gpm): 20+6.6

Simulation stream factor for lines 1 and 3: (20+9.4)/9.4 = 312.8%

Simulation stream factor for lines 101/103: (20+6.6)/6.6 = 403.0%

Example 5

Hydraulics of Pump with Single Discharge Flow Path and Continuous Spillback through a Restriction Orifice

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CONTINUOUS S/B WITH RO (CASE A) without its written permission. EFID

Circuit 6: STRIPPER REFLUX (CASE A ONLY) Case Design Case Alternate

Press 100.0% 110.0% 60.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

STRIPPER RECEIVER 11 20.30 20.30 20.30

Line 1 ‡ 3 2.2 0.04 0.09 20.30 0.09 20.30 0.09 20.30

Static Head 8 -3.03 20.21 -3.03 20.21 -3.03 20.21

STRIPPER REFLUX PUMP *Gov* 3 -56.64 23.24 -56.64 23.24 -56.64 23.24

Pump head, feet 157.1 157.05 157.05

Pump capacity, gpm 29 29 29

Flowing Specific Gravity 0.833

Operating Temperature, degF 100

Viscosity, cp 0.61

Line 3 ‡ 2 1.5 0.45 0.60 79.88 0.60 79.88 0.60 79.88

SPILLBACK SPLITTER 79.27 79.27 79.27

Line 5 1.5 .66 0.35 0.23 79.27 0.28 79.27 0.06 79.27

STRIPPER REFLUX CASE A ONLY FE(1705) 2 1.00 79.04 1.21 78.99 0.36 79.21

Line 20 1.5 .66 0.35 0.23 78.04 0.28 77.79 0.06 78.84

STRIPPER REFLUX CASE A ONLY CV(1605) 25.27 77.82 23.67 77.51 30.97 78.76

Line 21 1.5 2.4 0.35 0.84 51.50 1.02 52.57 0.21 47.70

Static Head 72 26.10 50.65 26.10 51.55 26.10 47.40

STRIPPER 72 24.56 25.45 21.30

‡ (Flow%=312.8)(Design%=100.0)(Alt%=100.0)

Example 5 (continued)

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ANY CITY, STATE must not be disclosed to others or reproduced in Proj

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CONTINUOUS S/B WITH RO (CASE A) without its written permission. EFID

Circuit 7: STRIPPER REFLUX (CASE B ONLY) Case Design Case Alternate

Press 100.0% 110.0% 60.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

STRIPPER RECEIVER 11 20.30 20.30 20.30

Line 101 ‡ 3 2.2 0.08 0.18 20.30 0.18 20.30 0.18 20.30

Static Head 8 -3.03 20.12 -3.03 20.12 -3.03 20.12

STRIPPER REFLUX PUMP (DUMMY) *Gov* 3 -50.29 23.15 -50.29 23.15 -50.29 23.15

Pump head, feet 139.4 139.38 139.38

Pump capacity, gpm 38 38 38

Flowing Specific Gravity 0.833

Operating Temperature, degF 100

Viscosity, cp 0.61

Line 103 ‡ 2 1.5 0.77 1.16 73.44 1.16 73.44 1.16 73.44

SPILLBACK SPLITTER 72.28 72.28 72.28

Line 5 1.5 .66 0.35 0.23 72.28 0.28 72.28 0.08 72.28

STRIPPER REFLUX CASE B ONLY FE(1795) 2 1.00 72.05 1.21 72.00 0.36 72.20

Line 20 1.5 .66 0.35 0.23 71.05 0.28 70.79 0.08 71.84

STRIPPER REFLUX CASE B ONLY CV(1695) 19.32 70.82 17.94 70.51 24.06 71.76

Line 21 1.5 2.4 0.35 0.84 51.50 1.02 52.57 0.30 47.70

Static Head 72 26.10 50.66 26.10 51.55 26.10 47.40

STRIPPER 72 24.56 25.45 21.30

‡ (Flow%=403)(Design%=100.0)(Alt%=100.0)

Example 5 (continued)

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COUNTRY any manner or used for any purpose whatsoever By

CONTINUOUS S/B WITH RO (CASE B) without its written permission. EFID

Circuit 6: STRIPPER REFLUX (CASE A ONLY) Case Design Case Alternate

Press 100.0% 110.0% 60.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

STRIPPER RECEIVER 11 20.30 20.30 20.30

Line 1 ‡ 3 2.2 0.02 0.05 20.30 0.05 20.30 0.05 20.30

Static Head 8 -3.03 20.25 -3.03 20.25 -3.03 20.25

STRIPPER REFLUX PUMP *Gov* 3 -63.83 23.28 -63.83 23.28 -63.83 23.28

Pump head, feet 176.9 176.91 176.91

Pump capacity, gpm 21 21 21

Flowing Specific Gravity 0.833

Operating Temperature, degF 100

Viscosity, cp 0.61

Line 3 ‡ 2 1.5 0.21 0.31 87.11 0.31 87.11 0.31 87.11

SPILLBACK SPLITTER 86.80 86.80 86.80

Line 5 1.5 .66 0.18 0.12 86.80 0.14 86.80 0.04 86.80

STRIPPER REFLUX CASE A ONLY FE(1705) 2 0.49 86.68 0.59 86.65 0.18 86.76

Line 20 1.5 .66 0.18 0.12 86.19 0.14 86.06 0.04 86.58

STRIPPER REFLUX CASE A ONLY CV(1605) 34.97 86.07 33.83 85.91 38.98 86.54

Line 21 1.5 2.4 0.18 0.44 51.10 0.53 52.08 0.16 47.56

Static Head 72 26.10 50.66 26.10 51.55 26.10 47.40

STRIPPER 72 24.56 25.45 21.30

‡ (Flow%=312.8)(Design%=100.0)(Alt%=100.0)

Example 5 (continued)

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ANY CITY, STATE must not be disclosed to others or reproduced in Proj

COUNTRY any manner or used for any purpose whatsoever By

CONTINUOUS S/B WITH RO (CASE B) without its written permission. EFID

Circuit 7: STRIPPER REFLUX (CASE B ONLY) Case Design Case Alternate

Press 100.0% 110.0% 60.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

STRIPPER RECEIVER 11 20.30 20.30 20.30

Line 101 ‡ 3 2.2 0.04 0.09 20.30 0.09 20.30 0.09 20.30

Static Head 8 -3.03 20.21 -3.03 20.21 -3.03 20.21

STRIPPER REFLUX PUMP (DUMMY) *Gov* 3 -56.64 23.24 -56.64 23.24 -56.64 23.24

Pump head, feet 157.1 157.05 157.05

Pump capacity, gpm 27 27 27

Flowing Specific Gravity 0.833

Operating Temperature, degF 100

Viscosity, cp 0.61

Line 103 ‡ 2 1.5 0.45 0.60 79.88 0.60 79.88 0.60 79.88

SPILLBACK SPLITTER 79.29 79.29 79.29

Line 5 1.5 .66 0.18 0.12 79.29 0.15 79.29 0.04 79.29

STRIPPER REFLUX CASE B ONLY FE(1795) 2 0.49 79.17 0.59 79.14 0.18 79.25

Line 20 1.5 .66 0.18 0.12 78.68 0.15 78.55 0.04 79.07

STRIPPER REFLUX CASE B ONLY CV(1695) 27.46 78.56 26.32 78.40 31.47 79.03

Line 21 1.5 2.4 0.18 0.44 51.10 0.53 52.08 0.16 47.56

Static Head 72 26.10 50.66 26.10 51.55 26.10 47.40

STRIPPER 72 24.56 25.45 21.30

‡ (Flow%=403)(Design%=100.0)(Alt%=100.0)

6. Normal Flow for Lowest Process Flow Case Below Pump Minimum Flow

This example involves a pump with a single discharge flow path and multiple process cases. At the normal (100%) flow scenario of the process case that governs the pump sizing, the process flow exceeds the minimum continuous flow of the pump and the spillback flow control valve is closed. At the normal (100%) flow scenario of the lowest process case, the process flow is less than the minimum continuous flow of the pump and the spillback flow controller automatically adjusts the opening of the spillback flow control valve until the flow through the pump equals or exceeds the minimum continuous flow. For the net forward flow circuit, the alternate flow scenario of the case governing the pump and all flow scenarios of the lowest process flow case are set equal to the pump minimum flow. For the spillback circuit of the lowest process flow case, the normal flow scenario is equal to the amount of fluid spilling back during normal operation and the alternate flow scenario is equal to the pump minimum flow.

The Design Engineer shall adhere to the following (see Example 6 hydraulic tabulations):

A flow meter on the pump discharge and a spillback splitter shall be added to the circuits which contain the pump.

The simulation, design flow scenario and alternate flow scenario factors are calculated by Tool T-510-04 and shall be applied accordingly. For the net forward circuit, enter the normal, design and alternate flow scenario factors for the circuit consistent with line 5. For the spillback circuit, the normal and alternate flow scenario should be set to 100%.

A spillback circuit shall be created. This circuit runs after the circuits which contain the pump. This circuit shall start at the spillback node, proceed through a control valve, and end at a nozzle on the vessel which provides suction to the pump. In column bottoms services, the spillback circuit can discharge into the reboiler inlet piping. In general, the spillback flow should not return to the suction piping immediately upstream of the pump.

Multiple circuits are required in order to show different pump minimum flow protection for each process case:

Two pump equipment numbers shall be provided. The “dummy” pump prevents an erroneous rated flow from being generated in the pump reports. The governing case circuit shall be run first, thereby selecting a pump and generating a pump curve. This pump curve shall then be entered manually into the “dummy” pump.
Two equipment numbers shall be provided for each control valve and flow element. To assist the Instrument Engineer, labels for these equipment numbers shall clearly indicate “Case A Only” or “Case B Only”, as appropriate.

Each circuit shall be labeled “Case A Only” or “Case B Only”, as appropriate. In Example 8, circuits 8, 9 and 10 each print twice. Note that circuit 8 only applies to Case A; therefore, the page corresponding to circuit 8 in Case B is erroneous data and shall be disregarded. Likewise, circuits 9 and 10 only applies to Case B; therefore, the page corresponding to circuits 9 and 10 in Case A is erroneous data and shall be disregarded.

The Instrument Engineer shall include the alternate flow scenario of the lowest process flow case on the sheet in the 616 Project Specification that corresponds to the forward flow control valve.

In the 616 Project Specification, the Instrument Engineer shall base the sizing of the spillback flow control valve on the alternate flow sceanrio of the lowest process flow case.

From Tool T-510-04, :

Example 6

Example Hydraulics of Pump with Single Discharge Flow Path and Minimum Flow Protection via Control Valve

(100%) Flow of Case A Governs Pump Sizing. (100%) Flow of Case B Falls Below Minimum Continuous Flow of the Pump.

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PROTECTIVE S/B WITH CV CASE A without its written permission. EFID

Circuit 8: BENZENE COLUMN NET BTMS (CASE A ONLY) Case Design Case Alternate

Press 100.0% 110.0% 50.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

BENZENE COLUMN 16 -10.20 5.1 -10.20 6.0 -10.20 2.0

Liquid Level 1 -0.16 15.3 -0.16 16.2 -0.16 12.2

Line 1 (Alt% = 66.0) 6 3.1 0.02 0.06 15.5 0.07 16.4 0.03 12.4

Static Head 14 -4.54 15.4 -4.54 16.3 -4.54 12.3

BENZENE COLUMN BOTTOMS PUMPS *Gov* 3 -101.57 20.0 -97.42 20.8 -112.91 16.9

Pump head, feet 310.6 297.9 345.3

Pump capacity, gpm 94 103 62

Flowing Specific Gravity 0.755

Operating Temperature, degF 279

Viscosity, cp 0.23

Line 3 (Alt% = 66.0) 3 1.9 0.62 1.18 121.6 1.43 118.3 0.53 129.8

BENZENE COLUMN BOTTOMS CASE A FE(1706) 3 1.56 120.5 1.88 116.9 0.39 129.3

Line 4 (Alt% = 66.0) 3 1.3 0.62 0.78 118.9 0.94 115.0 0.35 128.9

BENZENE BTMS PUMP SPILLBACK SPLITTER 118.1 114.1 128.5

Line 5 3 1.3 0.62 0.78 118.1 0.94 114.1 0.20 128.5

BENZENE BTMS TO TOL CASE A FE(1707) 3 1.56 117.3 1.88 113.1 0.39 128.3

Line 26 3 .92 0.62 0.57 115.8 0.69 111.2 0.14 127.9

Static Head 2 0.65 115.2 0.65 110.5 0.65 127.8

BENZENE BTMS TO TOL CASE A CV(1607) 2 25.13 114.6 20.20 109.9 38.12 127.1

Line 27 3 .87 0.62 0.54 89.4 0.65 89.7 0.13 89.0

Static Head 162 53.09 88.9 53.09 88.9 53.09 88.9

TOLUENE COLUMN 164 2.79 33.0 2.79 33.0 2.79 33.0

Example 6 (continued)

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Circuit 9: BENZENE COLUMN NET BTMS (CASE B ONLY) Case Design Case Alternate

Press 100.0% 110.0% 50.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

BENZENE COLUMN 16 -10.20 5.1 -10.20 6.0 -10.20 2.0

Liquid Level 0 -0.16 15.3 -0.16 16.2 -0.16 12.2

Line 101 ‡ 6 3.1 0.03 0.10 15.5 0.10 16.4 0.10 12.4

Static Head 14 -4.54 15.4 -4.54 16.3 -4.54 12.3

BENZENE COLUMN BOTTOMS PUMPS (DUMMY) 3 -90.67 19.9 -90.67 20.8 -90.67 16.8

Pump head, feet 277.3 277.3 277.3

Pump capacity, gpm 121 121 121

Flowing Specific Gravity 0.755

Operating Temperature, degF 279

Viscosity, cp 0.23

Line 103 ‡ 3 1.9 1.02 1.93 110.6 1.93 111.5 1.93 107.5

BENZENE COLUMN BOTTOMS CASE B FE(1708) 3 1.42 108.6 1.42 109.5 1.42 105.5

Line 104 ‡ 3 1.3 1.02 1.28 107.2 1.28 108.1 1.28 104.1

BENZENE BTMS PUMP SPILLBACK SPLITTER 105.9 106.8 102.8

Line 5 3 1.3 0.62 0.78 105.9 0.94 106.8 0.20 102.8

BENZENE BTMS TO TOL CASE B FE(1709) 3 1.56 105.2 1.88 105.9 0.39 102.6

Line 26 3 0.92 0.62 0.57 103.6 0.68 104.0 0.14 102.3

Static Head 2 0.65 103.0 0.65 103.3 0.65 102.1

BENZENE BTMS TO TOL CASE B CV(1609) 2 12.98 102.4 13.18 102.7 12.46 101.5

Line 27 3 0.87 0.62 0.54 89.4 0.65 89.5 0.14 89.0

Static Head 162 53.07 88.9 53.07 88.9 53.07 88.9

TOLUENE COLUMN 164 2.79 33.0 2.79 33.0 2.79 33.0

‡ (Flow%=127.7)(Design%=100.0)(Alt%=100.0)

Circuit 10: PUMP MINIMUM FLOW SPILLBACK (CASE B ONLY) Case Design Case Alternate

Press 100.0% .0% 100.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

BENZENE BTMS PUMP SPILLBACK SPLITTER 105.9 102.8

Line 8 (Flow%=27.7)(Alter%=461) 3 1.3 0.99 1.29 105.9 1.29 102.8

PUMP SPILLBACK CASE B CV(1606) 82.54 104.7 82.54 101.6

Line 9 (Flow%=27.7)(Alter%=461) 3 1.3 0.99 1.29 22.1 1.29 19.0

Static Head 17 5.52 20.8 5.52 17.7

BENZENE COLUMN 17 10.20 5.1 10.20 2.0

Example 6 (continued)

ANY CLIENT Note - the information in this document is Page

XXXXXX PROJECT confidential and the property of Inflection Point Engineering, and Date

ANY CITY, STATE must not be disclosed to others or reproduced in Proj

COUNTRY any manner or used for any purpose whatsoever By

PROTECTIVE S/B WITH CV CASE B without its written permission. EFID

Circuit 8: BENZENE COLUMN NET BTMS (CASE A ONLY) Case Design Case Alternate

Press 100.0% 110.0% 50.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

BENZENE COLUMN 16 -10.20 4.0 -10.20 5.0 -10.20 1.0

Liquid Level 0 -0.16 14.2 -0.16 15.2 -0.16 11.2

Line 1 (Alt% = 66.0) 6 3.1 0.01 0.02 14.4 0.02 15.4 0.01 11.4

Static Head 14 -4.54 14.3 -4.54 15.3 -4.54 11.4

BENZENE COLUMN BOTTOMS PUMPS *Gov* 3 -116.21 18.9 -114.88 19.9 -119.24 15.9

Pump head, feet 355.4 351.3 364.6

Pump capacity, gpm 48.5 53.4 24.3

Flowing Specific Gravity 0.755

Operating Temperature, degF 279

Viscosity, cp 0.23

Line 3 (Alt% = 66.0) 3 1.9 0.17 0.33 135.1 0.40 134.8 0.15 135.1

BENZENE COLUMN BOTTOMS CASE A FE(1706) 3 0.42 134.8 0.51 134.4 0.10 135.0

Line 4 (Alt% = 66.0) 3 1.3 0.17 0.22 134.3 0.27 133.9 0.10 134.9

BENZENE BTMS PUMP SPILLBACK SPLITTER 134.1 133.6 134.8

Line 5 3 1.3 0.17 0.22 134.1 0.27 133.6 0.06 134.8

BENZENE BTMS TO TOL CASE A FE(1707) 3 0.42 133.9 0.51 133.3 0.10 134.7

Line 26 3 .92 0.17 0.16 133.5 0.19 132.8 0.04 134.6

Static Head 2 0.65 133.3 0.65 132.6 0.65 134.6

BENZENE BTMS TO TOL CASE A CV(1607) 2 43.64 132.7 42.90 132.0 45.01 133.9

Line 27 3 .87 0.62 0.15 89.4 0.18 89.7 0.04 89.0

Static Head 162 53.09 88.9 53.09 88.9 53.09 88.9

TOLUENE COLUMN 164 2.79 33.0 2.79 33.0 2.79 33.0

Example 6 (continued)

ANY CLIENT Note - the information in this document is Page

XXXXXX PROJECT confidential and the property of Inflection Point Engineering, and Date

ANY CITY, STATE must not be disclosed to others or reproduced in Proj

COUNTRY any manner or used for any purpose whatsoever By

PROTECTIVE S/B WITH CV CASE B without its written permission. EFID

Circuit 9: BENZENE COLUMN NET BTMS (CASE B ONLY) Case Design Case Alternate

Press 100.0% 110.0% 50.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

BENZENE COLUMN 16 -10.20 4.0 -10.20 5.0 -10.20 1.0

Liquid Level 1 -0.16 14.2 -0.16 15.2 -0.16 11.2

Line 101 ‡ 6 3.1 0.01 0.03 14.4 0.03 15.4 0.03 11.4

Static Head 14 -4.54 14.3 -4.54 15.3 -4.54 11.3

BENZENE COLUMN BOTTOMS PUMPS (DUMMY) 3 -112.91 18.9 -112.91 19.9 -112.91 15.9

Pump head, feet 345.3 345.3 345.3

Pump capacity, gpm 62 62 62

Flowing Specific Gravity 0.755

Operating Temperature, degF 279

Viscosity, cp 0.23

Line 103 ‡ 3 1.9 0.28 0.54 131.8 0.54 132.8 0.54 128.8

BENZENE COLUMN BOTTOMS CASE B FE(1708) 3 0.38 131.2 0.38 132.2 0.38 128.2

Line 104 ‡ 3 1.3 0.28 0.36 130.9 0.36 131.9 0.36 127.9

BENZENE BTMS PUMP SPILLBACK SPLITTER 130.5 131.5 127.5

Line 5 3 1.3 0.17 0.22 130.5 0.27 131.5 0.06 127.5

BENZENE BTMS TO TOL CASE B FE(1709) 3 0.42 130.3 0.51 131.2 0.11 127.4

Line 26 3 0.92 0.17 0.16 129.9 0.19 130.7 0.04 127.3

Static Head 2 0.65 129.7 0.65 130.5 0.65 127.3

BENZENE BTMS TO TOL CASE B CV(1609) 2 40.04 129.1 40.84 129.9 37.74 126.6

Line 27 3 0.87 0.62 0.15 89.1 0.18 89.1 0.04 88.9

Static Head 162 53.07 88.9 53.07 88.9 53.07 88.9

TOLUENE COLUMN 164 2.79 33.0 2.79 33.0 2.79 33.0

‡ (Flow%=127.7)(Design%=100.0)(Alt%=100.0)

Circuit 10: PUMP MINIMUM FLOW SPILLBACK (CASE B ONLY) Case Design Case Alternate

Press 100.0% .0% 100.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

BENZENE BTMS PUMP SPILLBACK SPLITTER 130.5 127.5

Line 8 (Flow%=27.7)(Alter%=461) 3 1.3 0.29 0.38 130.5 0.38 127.5

PUMP SPILLBACK CASE B CV(1606) 110.02 130.1 110.02 127.1

Line 9 (Flow%=27.7)(Alter%=461) 3 1.3 0.29 0.38 20.1 0.38 17.1

Static Head 17 5.52 19.7 5.52 16.7

BENZENE COLUMN 17 10.20 4.0 10.20 1.0

7. Column Total Overhead Pump with Spillback

This example involves a column total overhead pump with multiple process cases. At the normal (100%) flow scenario for each process case, the process flow exceeds the minimum continuous flow of the pump and the spillback flow control valve is closed. An automated spillback is not required in column total overhead liquid service when – for all process cases - the sum of the normal (100%) reflux flow and turndown flow of net overhead liquid exceeds the minimum continuous flow of the pump. In this example, the requirement is not satisfied for Case 2; therefore, an automated spillback is required. For the alternate flow scenario of the lowest process flow case, the flow through the pump and spillback control valve is equal to the minimum flow of the pump.

The Design Engineer shall adhere to the following (see Example 7 hydraulic tabulations):

Create a node on the piping between the condenser and the receiver. The spillback circuit will discharge into this node. This node shall have the same elevation as the receiver inlet nozzle.

Both the reflux and net overhead circuits shall include the pump. This ensures that sufficient differential pressure will be available to both the reflux and net overhead flow control valves.

A flow meter on the pump discharge and a spillback splitter shall be added to the reflux and net overhead circuits.

A spillback circuit shall be created. This circuit shall run after the reflux and net overhead circuits. This circuit shall start at the spillback node, proceed through a control valve, and end at a node on the piping between the condenser and receiver. In general, the spillback flow should not return to the suction piping immediately upstream of the pump.

The simulation, design flow scenario and alternate flow scenario factors are calculated by Tool T-510-04 and shall be applied accordingly. For the net forward circuit, enter the normal, design and alternate flow scenario factors for the circuit consistent with line 5. For the spillback circuit, the normal and alternate flow scenario should be set to 100%.

The Instrument Engineer shall include the alternate flow scenario of the lowest process flow case on the sheets in the 616 Project Specification that correspond to the reflux and net overhead flow control valves.

In the 616 Project Specification, the Instrument Engineer shall base the sizing of the spillback flow control valve on the alternate flow scenario of the lowest process flow case.

From Tool T-510-04, :

Example 7 Hydraulics of Column Total Overhead Pumps with Minimum Flow Protection via Control Valve

ANY CLIENT Note - the information in this document is Page

XXXXXX PROJECT confidential and the property of Inflection Point Engineering, and Date

ANY CITY, STATE must not be disclosed to others or reproduced in Proj

COUNTRY any manner or used for any purpose whatsoever By

COLUMN OVERHEAD – PROTECTIVE S/B WITH CV CASE 1 without its written permission. EFID

Circuit 11: RECOVERY COLUMN REFLUX Case Design Case Alternate

Press 100.0% 110.0% 60.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

SPILLBACK MIXER 28 -11.00 -12.22 -9.27

Line 42 10 7.7 0.07 0.12 -11.00 0.14 -12.22 0.04 -9.27

RECOVERY COLUMN RECEIVER 25 -11.12 -12.36 -9.31

Liquid Level 0 -0.19 -11.12 -0.19 -12.36 -0.19 -9.31

Line 1 (Alt% = 95.9) 10 7.7 0.07 0.53 -10.93 0.64 -12.17 0.19 -9.13

Static Head 22 -8.13 -11.46 -8.13 -12.81 -8.13 -9.32

RECOVERY COLUMN OVERHEAD PUMPS 3 -78.95 -3.34 -73.33 -4.69 -80.15 -1.19

Pump head, feet 213.7 198.5 233.0

Pump capacity, gpm 619 681 593

Flowing Specific Gravity 0.853

Operating Temperature, degF 100

Viscosity, cp 0.48

Line 2 (Alt% = 95.9) 6 .01 0.87 0.01 75.61 0.01 68.64 0.00 78.96

REC COLUMN OVHD SPILLBACK FE(1710) 8 1.54 75.60 1.87 68.63 0.56 78.96

Line 3 (Alt% = 95.9) 6 .01 0.87 0.01 74.06 0.01 66.76 0.00 78.40

REC OVHD PUMP SPILLBACK NODE 74.05 66.75 78.40

Line 4 6 1.9 0.87 1.61 74.05 1.95 66.75 0.58 78.40

RECOVERY REFLUX + NET SPLITTER 72.44 64.80 77.82

Line 5 4 .74 0.62 0.46 72.44 0.56 64.80 0.17 77.82

RECOVERY COLUMN REFLUX FE(1711) 4 1.48 71.98 1.79 64.24 0.53 77.65

Line 35 4 1.6 0.62 1.00 70.50 1.20 62.45 0.36 77.12

RECOVERY COLUMN REFLUX CV(1611) 31.00 69.50 22.37 61.25 39.44 76.76

Line 36 4 3 0.62 1.84 38.50 2.22 38.88 0.66 37.32

Static Head 122 44.96 36.66 44.96 36.66 44.96 36.66

RECOVERY COLUMN 122 -8.30 -8.30 -8.30

Example 7 (continued)

ANY CLIENT Note - the information in this document is Page

XXXXXX PROJECT confidential and the property of Inflection Point Engineering, and Date

ANY CITY, STATE must not be disclosed to others or reproduced in Proj

COUNTRY any manner or used for any purpose whatsoever By

COLUMN OVERHEAD – PROTECTIVE S/B WITH CV CASE 1 without its written permission. EFID

Circuit 12: RECOVERY COLUMN NET OVERHEAD Case Design Case Alternate

Press 100.0% 110.0% 60.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

RECOVERY COLUMN RECEIVER 25 -11.12 -12.36 -9.31

Liquid Level 0 -0.19 -11.12 -0.19 -12.36 -0.19 -9.31

Line 1 (Alt% = 95.9) 10 7.7 0.07 0.53 -10.93 0.64 -12.17 0.19 -9.13

Static Head 22 -8.13 -11.46 -8.13 -12.81 -8.13 -9.32

RECOVERY COLUMN OVERHEAD PUMPS *Gov* 3 -78.95 -3.34 -73.33 -4.69 -80.15 -1.19

Pump head, feet 213.7 198.5 233.0

Pump capacity, gpm 619 681 593

Flowing Specific Gravity 0.853

Operating Temperature, degF 100

Viscosity, cp 0.48

Line 2 (Alt% = 95.9) 6 .01 0.87 0.01 75.61 0.01 68.64 0.00 78.96

REC COLUMN OVHD SPILLBACK FE(1710) 8 1.54 75.60 1.87 68.63 0.56 78.96

Line 3 (Alt% = 95.9) 6 .01 0.87 0.01 74.06 0.01 66.76 0.00 78.40

REC OVHD PUMP SPILLBACK NODE 74.05 66.75 78.40

Line 4 6 1.9 0.87 1.61 74.05 1.95 66.75 0.58 78.40

RECOVERY REFLUX + NET SPLITTER 72.44 64.80 77.82

Line 6 6 .95 0.45 0.43 72.44 0.52 64.80 0.16 77.82

RECOVERY COLUMN NET OVHD FE(1712) 6 1.42 72.01 1.72 64.28 0.51 77.66

Line 38 6 1.7 0.45 0.75 70.59 0.91 62.56 0.27 77.15

RECOVERY COLUMN NET OVHD CV(1612) 25.00 69.84 13.44 61.65 54.55 76.88

Line 39 6 6.4 0.45 10.12 44.84 12.24 48.21 3.65 22.33

LIMITS 34.72 35.97 18.68

Circuit 13: PUMP MINIMUM FLOW SPILLBACK Case Design Case Alternate

Press 100.0% .0% 100.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

REC OVHD PUMP SPILLBACK NODE 74.05 78.40

Line 7 (Flow %= 95.9) 6 1 0.28 0.28 74.05 0.28 78.40

PUMP SPILLBACK CV(1610) 76.36 73.77 78.98 78.12

Line 8 (Flow %= 95.9) 6 1 0.28 0.28 -2.59 0.28 -0.86

Static Head 28 8.13 -2.87 8.13 -1.14

SPILLBACK MIXER 28 -11.00 -9.27

Example 7 (continued)

ANY CLIENT Note - the information in this document is Page

XXXXXX PROJECT confidential and the property of Inflection Point Engineering, and Date

ANY CITY, STATE must not be disclosed to others or reproduced in Proj

COUNTRY any manner or used for any purpose whatsoever By

COLUMN OVERHEAD – PROTECTIVE S/B WITH CV CASE 2 without its written permission. EFID

Circuit 11: RECOVERY COLUMN REFLUX Case Design Case Alternate

Press 100.0% 110.0% 60.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

SPILLBACK MIXER 28 -9.25 -9.67 -8.64

Line 42 10 7.7 0.07 0.04 -9.25 0.05 -9.67 0.02 -8.64

RECOVERY COLUMN RECEIVER 25 -9.29 -9.72 -8.66

Liquid Level 0 -0.19 -9.29 -0.19 -9.72 -0.19 -8.66

Line 1 (Alt% = 95.9) 10 7.7 0.03 0.20 -9.10 0.24 -9.54 0.07 -8.47

Static Head 22 -8.13 -9.30 -8.13 -9.77 -8.13 -8.54

RECOVERY COLUMN OVERHEAD PUMPS 3 -88.98 -1.17 -87.97 -1.65 -89.36 -0.41

Pump head, feet 240.8 237.8 249.4

Pump capacity, gpm 365 402 350

Flowing Specific Gravity 0.853

Operating Temperature, degF 100

Viscosity, cp 0.48

Line 2 (Alt% = 95.9) 6 .01 0.31 0.00 87.81 0.00 86.32 0.00 88.95

REC COLUMN OVHD SPILLBACK FE(1710) 8 0.54 87.81 0.65 86.32 0.19 88.95

Line 3 (Alt% = 95.9) 6 .01 0.31 0.00 87.27 0.00 85.67 0.00 88.76

REC OVHD PUMP SPILLBACK NODE 87.27 85.67 88.76

Line 4 6 1.9 0.31 0.58 87.27 0.70 85.67 0.21 88.76

RECOVERY REFLUX + NET SPLITTER 86.69 84.97 88.55

Line 5 4 .74 0.24 0.17 86.69 0.21 84.97 0.06 88.55

RECOVERY COLUMN REFLUX FE(1711) 4 0.53 86.52 0.64 84.76 0.19 88.49

Line 35 4 1.6 0.24 0.38 85.99 0.46 84.12 0.14 88.30

RECOVERY COLUMN REFLUX CV(1611) 48.25 85.61 46.16 83.66 51.25 88.16

Line 36 4 3 0.24 0.70 37.36 0.84 37.50 0.25 36.91

Static Head 122 44.96 36.66 44.96 36.66 44.96 36.66

RECOVERY COLUMN 122 -8.30 -8.30 -8.30

Example 7 (continued)

ANY CLIENT Note - the information in this document is Page

XXXXXX PROJECT confidential and the property of Inflection Point Engineering, and Date

ANY CITY, STATE must not be disclosed to others or reproduced in Proj

COUNTRY any manner or used for any purpose whatsoever By

COLUMN OVERHEAD – PROTECTIVE S/B WITH CV CASE 2 without its written permission. EFID

Circuit 12: RECOVERY COLUMN NET OVERHEAD Case Design Case Alternate

Press 100.0% 110.0% 60.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

RECOVERY COLUMN RECEIVER 25 -9.29 -9.72 -8.66

Liquid Level 0 -0.19 -9.29 -0.19 -9.72 -0.19 -8.66

Line 1 (Alt% = 95.9) 10 7.7 0.03 0.20 -9.10 0.24 -9.54 0.07 -8.47

Static Head 22 -8.13 -9.30 -8.13 -9.77 -8.13 -8.54

RECOVERY COLUMN OVERHEAD PUMPS 3 -88.98 -1.17 -87.97 -1.65 -89.36 -0.41

Pump head, feet 240.8 237.8 249.4

Pump capacity, gpm 365 402 350

Flowing Specific Gravity 0.853

Operating Temperature, degF 100

Viscosity, cp 0.48

Line 2 (Alt% = 95.9) 6 .01 0.31 0.00 87.81 0.00 86.32 0.00 88.95

REC COLUMN OVHD SPILLBACK FE(1710) 8 0.54 87.81 0.65 86.32 0.19 88.95

Line 3 (Alt% = 95.9) 6 .01 0.31 0.00 87.27 0.00 85.67 0.00 88.76

REC OVHD PUMP SPILLBACK NODE 87.27 85.67 88.76

Line 4 6 1.9 0.31 0.58 87.27 0.70 85.67 0.21 88.76

RECOVERY REFLUX + NET SPLITTER 86.69 84.97 88.55

Line 6 6 .95 0.16 0.16 86.69 0.19 84.97 0.06 88.55

RECOVERY COLUMN NET OVHD FE(1712) 6 0.49 86.53 0.59 84.78 0.18 88.49

Line 38 6 1.7 0.16 0.27 86.04 0.33 84.19 0.10 88.31

RECOVERY COLUMN NET OVHD CV(1612) 53.81 85.77 51.23 83.86 70.52 88.21

Line 39 6 6.4 0.16 1.05 31.96 1.27 32.63 0.38 17.69

LIMITS 30.91 31.36 17.31

Circuit 13: PUMP MINIMUM FLOW SPILLBACK Case Design Case Alternate

Press 100.0% .0% 100.0%

Drop --------------- --------------- ---------------

Line 100 Per Nozl Press Inlet Press Inlet Press Inlet

Size Eq 100ft Elev Drop Press Drop Press Drop Press

Equipment Identification in ft psi ft psi psig psi psig psi psig

REC OVHD PUMP SPILLBACK NODE 87.27 88.76

Line 7 (Flow %= 95.9) 6 1 0.28 0.28 87.27 0.28 88.76

PUMP SPILLBACK CV(1610) 87.83 86.99 88.71 88.48

Line 8 (Flow %= 95.9) 6 1 0.28 0.28 -0.84 0.28 -0.23

Static Head 28 8.13 -1.12 8.13 -0.51

SPILLBACK MIXER 28 -9.25 -8.64

APPENDIX A

DECISION TREE A - Automated Pump Spillbacks

APPENIDX B

DECISION TREE B - Automated Spillbacks Associated with Column Total Overhead Pumps