| What's New:
Hytran is continuously undergoing development to include the many
features requested by Hytran's growing number of international users.
Hytran v3.7.6-2 has these new fixes and improvements
(PDF file 27kb). More
Hytran v3.7.2-5 has these new fixes and improvements
(PDF file 20kb). More
Hytran v3.6.2 has these New features.
Hytran v3.6.2 has these Improvements.
Download description v 3.6.2 new
features (1.9 MB pdf file)
Hytran v3.5.4 has these New features.
Hytran v3.5.4 has these Improvements.
Hytran v3.4.8 has these New features.
Hytran v3.4.4 has these New features.
Hytran v3.4.2 has these New features.
Hytran v3.3.9 has these New features.
Hytran v3.1.5 - v3.2.8 has these New features.
Hytran v 3.6.2 New Features
- DRES, URES,VALD, VALI : % opening
vs Coefficient added to Input
- VALI: New algorithm and Optional
inclusion of the additional headloss
- SURG: Option to allow the tank
- Pump/RUNS allows the user to
input pump curve
- Pump/STAR/CHEK and PUMP/SHUT/CHEK
allow users to input pump curve
- PUMP/STAR/VALI and PUMP/SHUT/VALI
allow users to input pump curve
- Text Boxes to label the drawing
- View Dialog box for convenient
editing of node and pipe data
- AIRV: Back Siphon Break Option
- Help for VISTA
- PIPES: Drawing Parallell Curved
- PUMP/VALI Input. Valve coefficients
vs % Stem Movement as input
- PIPES: Composite Pipes added
to the Pipe Input Dialog
- PIPES: Pipe Constraints added
to Pipe Dialog box
- EPANET import now reads alpha
names in the *.inp file
- Place EPANET Flow BC's on upstream
node of the EPANET definition
- EPANET: Where there is BC already
on the Uspstream node or it is an Branch node, the pipe is split and
the BC is located at split location
- PIPES: Curved pipes available
for parallel pipes in EPANET
- Pipes++ can have the same features
- AIRC: MASSAL Air Chamber New
algorithm to include air valve specification
- Surg Inflow to all surge tanks
- PIPE: Dummy Pipes now in RED
Hytran v 3.6.2 Improvements
- Vali: The headloss through
the in-line control valve have been recoded to provide more stability
when the flow is reversing through the valve while it is closing
- Pipe Selection indicator: When
selecting a pipe, a rectangular box appears enclosing the selected
- DRES/VALVE Bug
removed for reverse flowout of Reservoir
- Fluid properties Hytran now
requires the atmospheric pressure to be enters in bar or psi
- EPANET conversion of MLD to
- Pump/Part/Shut/Check: Corrected
bug in Pump/Part/Shut/Check which prevented th edialog box closing
when this option is selected
- STAN: Stan Pipe at an end nodes
did not read the run correctly as misreads the end node type
- SURG dialog did not record
some charges to the Spill included and Tank Area options.
- SURG Simple Branch did not
stop at RL min corrected
- Surg Orifice junction and branch
can continue at RL Min
- PIPE: Additional Pipe Ratings
available from 2.5 - 64 bar
- Min pressure envelop available
Hytran v3.5.4 has these new features:
- New - Maximum
Allowed Operating Head (MAOH): This option is activated
when the MAOH is specified in th ePipe Input Dialog. When the MAOH
value is input, the MAOH may be plotted along the Pipe profile to
show if the value has been exceeded.
- New - Head
loss K term: The head loss coefficient K has been added
to the List Data / Pipe Data spreadsheet and can be edited
- New - Excel
like spread sheet added to the List Data dialogs:
The spreadsheet allows more flexible editing of the data contained
in the cells. Rows may be deleted or inserted and cell content can
be CUT, COPY and PASTED to another cell.
- New - By-Pass
added to Check Valve: This
option allows a bypass to be modelled in the check valve
- New - Altitude
Valve with Surge Relief Overide Option (SRO): The atitude
valve is added to the Head breaking Tank boundary condition. When
the tank level reaches the shut off level, the valve closes according
to the prescribed rate. There is an option to model surge over ride
if the valve pressure exceeds the set point and moduilate to that
pressure. The reopening of the valve can be delayed (hystersis effect).
- New - Pressure
sensitive Relief Valve: The valve opens when the pressure
exceeds the set point and modulates to the set point. The valve closes
when the pressure falls below the set point. The opening and closing
ates are assigned by the user
- New - Pressure
sensitive Surge Relief Valve: The valve opens and remains
open when the pressure drops below the lower set point to anticipate
the return of the upsurge. The valve opens or reopens when the rpessure
exceeds the higher set point. The opening and closing ates are assigned
by the user
- New - Surge
Relief Override to PRED: SRO has been added to all pressure
regulating valves in the PRED family of valves.
- New - Surge
Relief Override to VALI, VALD and DRESD / VALV: SRO option
has been added to the Inline control valve VALI, downstream discharge
valve VALD and the Downstream reservoir control valve DRES / VALV.
With this option the user assigns valve closing rates rather than
the actual time for the valves to close. If the pressure exceeds the
SRO set point, the valve closure is arrested and may even reopen to
alleviate transient pressures.
- New - STAN:
Constant inflow added to upstream standpipe BC
- New - VALI
and VALD reads the %valve area vs Coefficient to allow
custom definition of the valve coefficients.
- New - URES
and DRES valve reads the %valve area vs Coefficient to
allow custom definition of the valve coefficients.
- New - VALI
improved algorithm using the Cd coefficient and option to include
additional dead loss if pipe and valve diameters not the same. Previously
headloss was automatically included
Hytran v3.5.4 has these improvements:
- Node reduced level (RL) information added to most boundary conditions
- Minor head loss initialized for input to all pipes
- Fixed the right hand side of the plot scale of the BC performance
- Fixed the LIST DATA / Node Coordinates spreadsheet inconsistent
changes to the HGL.
- Fixed the PUMP / FAIL / ANTI pump speed not reducing to zero
- Added maximum pressure difference between nodes.
- TEL corrected at URES, PUMP and STAN nodes
- Memory leaks removed from Turbine BC
- Help for Orifice surge tank and Turbine revised
- EPANET import bug removed for SURG
- Max/min HGL have improved reporting and can be exported to Excel
- Hytran Engine now produces the *.env and *.max files
- When exiting Hytran in PLAN View it closes the window first before
exiting - previously crash
- Corrected the HGL pipe profile plots for reverse pipes, arrow flow
directions and node numbers and BC placements
Hytran v3.4.8 has these New features:
New - Sub-atmospheric
pressure indicator in pipelines during transients
New - ReRunning under
Plot HGL/Re Run HGL Transient View can now have selected
time windows to view the transients
New - Transients at the
Plot Node Lines can be displayed for selelected times
New - Split Pipes
will split pipes into selected proportion
New - Pipe Delimiting or Pipe
Class heads can be plotted and compared to the maximum pressure
New - Export Plot files
to Microsoft Excel (*.xls) format for custom plotting
New - Exporting text files to
WORD or any other text editor
New - Friction Modes: Unsteady
friction available to selected Hytran users
Improved - Pipes
sorted into numerical order before displaying the
Improved - Dummy pipes sub reaches
can be either be set to 1 or 2 (default = 1)
Improved - EPANET2 importing
Hytran v3.4.4 has these New features:
Coefficients: The traditional valve coefficents (Cv
(Imperial units) and Kv (SI units)option has been added to all valve
input dialog boxes.
New PIPE CLASS Delimiiting
Information: The pipe class based on the PN10, PN16,
PN25, PN40 and PN64 can be plotted on the Max / Min HGL profile. The
length and percentage of the each Class of pipe are tabulated in the
New PIPE Minor Head Losses:
Minor head losses can now be input for pipes.
New TANK: Head
breaking tank added to list of Boundary conditions.
New Hytran Engine
to run transient analysis without graphics (approx 10-30 times faster).
The results can be replayed faster than the real time graphics.
New Panning Tool
to move the drawing to more convneient position on the screen.
New Find Tool
for finding the location pipes and nodes in a drawing.
Hytran v3.4.2 has these New features:
TOOL improved zoom tools
New Split Pipes
can be split pipes in any proportion
pressure indicator to pipes
New ReRunning Transient
View can have selected time windows to view the transients
New Time Window
can be selected for replotting the transients at the Plot Node
New Wave action
added to DRES and URES boundary conditions
Hytran v3.3.9 has these New features:
or Schematic drawing modes. Default is DrawToScale where
the pipe lengths are automatically calculated. In the Schematic mode,
the pipe length is a required input.
New Dummy Pipe
can be used to connect two or more exisitng boundary conditions to create
a new one.
New Run-in Time
to allow steady state conditions to settle down before a transient run.
New AIRC: Bladder,
Charlatte, and Massal type air chambers added. Can have identical chambers
at on location. Also inidcator for maximum working pressure.
New AIRV anti-shock
option available in air vaves, vacuum break feature to allow sub atmospheric
pressures in a pipe before valve opens.
operation controlled by the valve characteristic including reverse
velocity and deceleration of fluid flow.
can be instaled at a pipe junction to model leakage from a pipe.
New Attempt Steady State
to find the steady state conditions before a transient run. The
Steady State conditions of discharge and HGL at ndoes can be saved.
software avaialble to process turbine Hill charts.
New HGL Pipe Profiles
can be saved and recalled. Also pipes with reverse flwo directiosn can
New Pipe and BC
selection is less sensitive and easier to select.
variable level option.
sprinkler boundary condition added to list.
family of pressure reducing/ sustaining / reducing sustaining a nd flow
control valves added to BC list.
can be used to model reinjection wells.
Hytran v3.1.5 - v3.2.8 has these New features:
NEW - EPANET2
can import both the EPANET2 (*.inp) network file and the gerenated
report files (*.rpt) to obtain the steady state disharge and HGL at
NEW - Looped Network
can analyze transients in looped network distributions. Requires the
steady state HGL at all nodes are required as input data.
NEW - Attempt Steady State
can now attempt to find a steady state solution for a network using
approximate HGL at nodes and pipe discharges.
NEW - AIRC: Air chamber
chamber can now have a different inlet and outlet diameters between
the pipe and air chamber.
NEW - STAN:
stand pipe with variable area vs elevation curve is available.
NEW - TURB/RELV: Additioanl
options added to this BC.
NEW - VALVES: Improved
algorithm for all valves based on the stem position and discharge coefficients.
New - PUMP/FAIL/ANTI:
The Anti-Surge valve at the pump discharge opens whenever
the pressure falls below a preset lower pressure limit. When the pressure
exceeds the lower limit, the valve then closes according to a preset
time. When the pressure is above a preset upper pressure, the valve
reopens to control the anticipated upsurge. The valve remains open until
the pressure falls below the preset upper limit after which the valve
closes according to the preset time.
New - PUMP/FAIL/VALI:
This has been added as some older pump installations have air controlled
valves to normally close the valve in a set time while the pump is still
running at full speed as the method of pump shut down. (This is the
same as PUMP/SHUT/VALI.) In the event of a power failure, however, the
pump will trip and use the remaining air to close the valve.
NEW - PRVA/RELV:
Improved algorithm for modelling pressure relief valves.