DF Solutions Utilities are used to create, modify and manage
data files used by the DF programs. The utilities provide the
ability to manipulate data files for fluid properties, pipe
specifications, material specifications, component information,
pumps, and unit conversions. The utilities allow customizing
the DF program data to include the information that is most
useful to the user. The utilities are included as part of the
Professional package and DesigNet.
utilities can read the actual data files used by the DF programs
and allow the user to modify these files or, by directing the
utilities to other directories, create files "off-line".
The resulting files can later be transferred to the appropriate
directories for use by the DF program. A brief description of
each utility follows.
to create and modify fluid property data files. Fluids are organized
by "Fluid Class" for selection from the DF program
menu. The fluid can be either Compressible or Incompressible.
Density and viscosity data may be specified in data points or
equations. Viscosity can be determined using Sutherland's formula.
Data points, if specified, are only functions of temperature.
specifying size data for piping. For example, this utility would
allow creating a data file giving available size information
for plastic pipe. This information could include the pipe material
density and the dimensional data. The pipe utility will then
calculate the weight per foot. Other data include name, type
of material and absolute roughness.
Conversion Data Utility
to create new unit conversion files or adding new units to existing
files. The utility has two types of conversions. The first is
similar to conversions of length measurements. That is, a measurement
in one unit is simply a multiple of the measurement in another
unit (or U2 = U1 * Factor). The second type is similar to temperature
scales where there is also an offset (or U2 = U1 * Factor +
the creation of fluid resistance data for components. The components
so defined can then be selected from menus in the DF programs
and used in building branches. Component flow resistance can
be input as a constant resistance, as data points at various
flows, as data points for various sizes, or as related to an
arbitrary parameter specified by the user (such as % open for
a throttled valve). Each method allows specifying the flow resistance
in both the forward and reverse flow directions. The utility
will fit equations to the data points entered by the user. The
curves can be displayed and printed.
creation of data files containing pump head/flow data. The user
can enter points from a pump head/flow curve, and the utility
will generate the head/flow equation for use by the DF programs.
The head/flow curve can also be displayed and printed.
to create of data files containing data for material strength
to be used in evaluating the internal pressure capability of
piping or in determining minimum wall thickness requirements.
Once created, these material specification databases may be
selected from the DF program menus and used just as the standard
specifications included with the DF programs. The basic data
includes specification name, revision and material name simply
as identifiers for the data in the file. Allowable stress as
a function of temperature can be entered along with dimensional
tolerance. For B31.1, B31.3 High Pressure and Plastic equation
types, a value of a temperature correction factor is added as
a function of temperature.