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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.

Section 5.17b PUMPLOSS Command

COMMAND NAME: PUMPLOSS

PUMPLOSS computes a 1-D table of Type 4 defining losses for the inlet, inlet conduit, and outlet conduit for one or more identical pumps. 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.
Multiple pumps have identical inlet and outlet conduits. If multiple pumps share a common conduit, then the number of pumps in the PUMPLOSS command must be given as one and Q_MAX becomes the sum of the maximum flows for the pumps.

LINE 1

 Variable: QUNIT Format: 6X, F10.0 Example: QUNIT= 0.002228
 Explanation: Gives the conversion factor to convert the maximum 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

 Pump Number Inlet Inlet Outlet Outlet Inlet Max Loss of = Conduit Conduit Conduit Conduit Loss Pump Table Pumps Length Table Length Table Factor Flow 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: LOSS_TAB, NUMBER_OF_PUMPS, INLET_LENGTH, INLET_TAB, OUTLET_LENGTH, OUTLET_TAB, INLET_LOSS_FACTOR, Q_MAX, LABEL Format: 2I8,F8.0,I8,F8.0,I8,2F8.0,1X,A50 Example: 1204 1 30.0 36 60.0 36 0.40 25000. loss for pump for C29
 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.
 LOSS_TAB is the table number to use for the loss 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. This table describes the conduit for a single pump. If given as zero, inlet conduit and inlet losses are taken to be zero.
 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. This table describes the conduit for a single pump. If given as zero, outlet conduit losses are taken to be zero.
 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.
 Q_MAX is the maximum flow expected through one pump. This will be larger then the design flow for the pump. How much larger depends on the characteristics of the pump. The dimensionless axial-flow pump capacity relationship used in the command AXIALPMP has a maximum flow of  times the design capacity. This flow is in units implied by QUNIT.
 LABEL is up to 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 loss table required. A negative value for the LOSS_TAB terminates the command.

Back to Franz and Melching (1997b), p. 78, for section 5.0, Input description for the full equations utilities model: Version 4.0