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[FEQUTL Update Contents]
Enhancements and Modifications to the Full Equations Utilities (FEQUTL)
Model, March 1995 to August 1999.
Note: This document is separate from the U.S. Geological Survey report by Franz and Melching (1997). This description of enhancements and modifications to the Full Equations Utilities Model has not been approved by the Director of the U.S. Geological Survey.
New subsection for section
5. Input Description for the Full Equations Utilities Model: Version 4.0,
Franz and Melching (1997b), p. 80
Section 5.1a
AXIALPMP Command
To
RELEASE.TXT
AXIALPMP COMMAND
AXIALPMP computes
a 1-D table of Type 2 defining a net pump table for an axial-flow pump
with losses for the inlet, inlet conduit, and outlet conduit included in
the table. The conduits are assumed to always flow full in the computation
of the losses. It is further assumed that the losses in the inlet and outlet
conduits are given by the losses in fully developed flow. This is only
an approximation because the inlet and outlet conduits are often short
relative to their opening size. Thus the flow may not have the distance
required to become fully developed.
The axial-flow pump is assumed to
have a specific speed of 12,000 (flow in gallons per minute, speed in revolutions
per minute, and head in feet) and a dimensionless head-capacity curve similar
to that given in Daugherty and Franzini(1977, p. 513). The head-capacity
relation is defined for a given pump when the design head and the design
flow are given. It is assumed that these design points are at maximum efficiency
for the pump.
Each pump is assumed to have an identical
inlet, inlet conduit, and outlet conduit. If multiple pumps share an inlet
and outlet conduit, then AXIALPMP
should
be used to compute the aggregate pump capacity table excluding the inlet,
inlet conduit, and outlet conduit. The command PUMPLOSS
should
then be used to compute the losses in the inlet, inlet conduit, and outlet
conduit.
LINE 1
| Variable: |
QUNIT |
| Format: |
6X, F10.0 |
| Example: |
QUNIT= 0.002228 |
| Explanation: |
| Gives the conversion factor to convert
the design flows given below to the flow required for the FEQ simulation.
For example, pump capacities are often given in gallons per minute. However,
FEQ requires flows to be in cubic feet per second when the United States
customary units are used. The example value of QUNIT
then
converts from gallons per minute to cubic feet per second. |
LINE 2-5
| Variable: |
HEADING |
| Format: |
A112 |
| Example: |
|
|
Net
|
Number
|
Inlet
|
Inlet
|
Outlet
|
Outlet
|
Inlet
|
Pump
|
Pump
|
|
|
Pump
|
of =
|
Conduit
|
Conduit
|
Conduit
|
Conduit
|
Loss
|
Design
|
Design
|
|
|
Table
|
Pumps
|
Length
|
Table
|
Length
|
Table
|
Factor
|
Head
|
Q(gpm)
|
Label
|
| ------- |
------- |
------- |
------- |
------- |
------- |
------- |
------- |
------- |
------- |
| Explanation: |
| Gives the descriptive headings for
the lines of input to follow. There must be four lines in the descriptive
heading. It is best to cut and paste the headings from an example input
for FEQUTL. |
LINE 6
| Variable: |
NET_PUMP_TAB, NUMBER_OF_PUMPS,
INLET_LENGTH, INLET_TAB, OUTLET_LENGTH, OUTLET_TAB, INLET_LOSS_FACTOR,
H_DES Q_DES, LABEL |
| Format: |
2I8,F8.0,I8,F8.0,I8,3F8.0,1X,A50 |
| Example: |
3204 1 30.0 36 60.0
36 0.40 7.0 15000. Pump for C24C3 |
| Explanation: |
| All input fields but the last are
8 columns wide and COLUMNS ARE IMPORTANT. No part of any input item should
fall outside of its field. Note that the headings define the field width. |
 |
NET_PUMP_TAB is
the table number to use for the net-pump capacity
table to be computed. |
|
NUMBER_OF_PUMPS is
the
number of identical pumps working in parallel. All pumps are assumed to
be operating simultaneously. |
|
INLET_LENGTH is
the length of the inlet conduit |
|
INLET_TAB is
the table number of the cross-section function
table computed for the inlet conduit using one of the commands (SEWER,
MULPIPES, MULCON, FEQX, FEQXLST, FEQXEXT) provided by FEQUTL. If this table
number is given as zero then losses in the inlet conduit and the inlet
are taken to be zero. This option is provided in order to permit the computation
of the capacity table for the pump without the losses in the inlet conduit
or the inlet. The user can provide these losses from some other source
in this case. |
|
OUT_LENGTH is
the length of the outlet conduit. |
|
OUTLET_TAB is
the table number of the cross-section function
table computed for the outlet conduit using one of the commands (SEWER,
MULPIPES, MULCON, FEQX, FEQXLST, FEQXEXT) provided by FEQUTL. If this table
number is given as zero then losses in the outlet conduit are taken to
be zero. This option is provided in order to permit the computation of
the capacity table for the pump without the losses in the outlet conduit.
The user can provide these losses from some other source in this case.
If both the conduit cross-section table numbers are zero, then the capacity
table computed is for the pump alone. |
|
INLET_LOSS_FACTOR gives
the decimal fraction of the velocity head in the inlet conduit to apply
to represent the loss of mechanical energy in the inlet to the inlet conduit. |
|
H_DES is
the design head for the pump. Taken to be at
point of maximum efficiency. |
|
Q_DES is
the design flow for the pump in the units implied
by QUNIT.
Taken to be at the point of maximum efficiency. |
|
LABEL is
upto
50 characters of descriptive information for the pump that will be placed
after the heading line in the net capacity table for the pump. |
Notes: Line 6 is repeated for each pump for which a capacity table is
desired. A negative value for the NET_PUMP_TAB
terminates
the command.
Back
to Franz and Melching, (1997b), p.80, for section 5.2, CHANNEL
Command