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HYTRAN
Water Hammer and Surge Analysis in Pipe Systems

Hytran is an easy to use, but powerful simulator of water hammer in pipe systems including pipe networks. Its graphical presentation of the phenomenon - in real-time along the pipeline as the pressure waves progress and reflect, and at user-selected fixed locations - imparts an almost intuitive understanding of the system performance. A simple drag-and-drop technique is used to generate a flowsheet representation of the pipe system and a wide range of equipment items can be simulated. These include multiple pumps, check valves, discharge tanks, control valves, pressure reducing valves, etc. The screen image mosaic (left) shows a simple pipe flow system consisting of a single pump discharging via 2,250m of 400mm steel pipe to a reservoir at an elevation 40m above the pump. The upper image is the flowsheet schematic from our software package FluidFlow3 and the image bottom right shows the steady-state performance of the pump - capacity, system and efficiency curves. Exporting this model to Hytran and solving for pump trip (with no protection devices) generated the image bottom left. This shows the time-dependent pressures at the pump. After 10s of steady-state running, the pump tripped and pump head immediately fell. At 30s after pump trip there was a significant spike in pressure at the pump. This was due to column separation at the 30m elevation high point in the line. Column separation and re-join continued with the peaks gradually attenuating due to friction in the line.

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HYTRAN: Water Hammer and Surge Analysis  Previous  Home  Next The goal in developing Hytran, apart from being an accurate analytical tool, was to produce software that is simple to use and able to impart a better understanding of the water hammer phenomenon. Seeing real time transient graphics flashing across the display screen takes away much of the mystery that seems to surround this topic. Hytran has many applications in the water and wastewater industries and in the mining, oil and petrochemical industries. It can be used for the simulaiton of water hammer in fixed fire protection systems. Sneak Preview…click here for a quick look at Hytran's advanced graphical display of transient behaviour. The simulation is of a rising main with a single pump delivering to a reservoir. The transients which occur on pump failure are displayed. Note the following as you run the simulation: Instantaneous pressure variation with time along the pipeline is plotted. Pressure variation with time at three fixed locations is shown in the insert Window (the locations are identified by coloured vertical lines on the pipe, eg the blue line at the pump). Flow direction is indicated by the red and blue arrows in the pipe. Column separation is identified by black dots in the pipe at the upstream high point. You will need an appropriate viewer loaded onto your computer to run this AVI file, eg RealPlayer. Water Hammer and Risk Assessment In any pipe flow design, and as part of its reisk assessment, a water hammer analysis should be conducted. Click here to veiw a paper describing this in detail. Using Hytran is a simple 3-step process... STEP 1: BUILD THE PIPE SYSTEM Simply click and drag the pipe into position using the auto-scaling feature - then adjust pipe lengths and elevations to correct values. Single pipelines, complex pipe networks. Single or multiple pumps in parallel and in series. No limit on the number of pipes, nodes or BC's Non-return valves, control valves, manual valves. Mouse driven drag-and-drop 21 Boundary Conditions (BC's): pumps, valves etc. Pipe nodes may be snapped together. Drag and drop BC's to nodes. Comprehensive pump options: fail, start, shut, & run. Input data dialogs at a click. Visual indicator to show input data is required. Network can be drawn on an elevation or plan view. Zooming facilities. Simple graphical editing of pipeline, cut & paste BC's. Edit the pipeline and BC's at any time. Delete pipes and nodes. Try different BC's without having to edit external files. Extensive network checks to minimise errors. STEP 2: DEFINE THE BOUNDARY CONDITIONS Hytran will model the following 21 Boundary Conditions and Control Devices: Component Palette Left Column Middle Column Right Column   Atmospheric Discharge Check Valve Draw Off Pump Station Sprinkler Turbine Inline Valve Air Chamber Dead End Downstream Reservoir Pressure Relief Valve Stand Pipe Upstream Reservoir Turbine Valve Air Valve Discharge Tank Pressure Reducing Valve Pressure Relief Valve Surge Tank Downstream Valve Head Tank The remaining icons are drawing tools. 3. RUN THE TRANSIENTS You can actually see the instantaneous transient HGL as the pressure transients travel the pipeline. Transients at user-defined at fixed points along the pipeline can also be displayed in real time. Hytran allows: Real time display of the instantaneous transients along pipe profile. View transients at any location in the pipeline network. Flow direction in pipes showing influence on transients. Column separation indictor when cavitation occurs. Extensive output listing. Print transients plots directly or customise graphs via spreadsheet. For more information click here. For a PowerPoint presentation of a water hammer catastrophe click here  HYTRAN: Water Hammer and Surge Analysis  Previous  Home  Next  Fluid Flow (Home) |  About Us |  Navigate this site  |  Contact Us  | Top