Bentley HAMMER V8i

Water Hammer and Transient Analysis Software




HAMMER demystifies the complex science of water hammer and transient analysis and puts the power to perform this critical work in your hands.

Trust HAMMER's computationally rigorous hydraulic engine and easy-to-use interface to efficiently identify, manage, and mitigate the risks associated with transients.

  • Develop cost-effective surge control strategies
  • Prevent costly infrastructure damage
  • Trim construction, operation and maintenance budgets
  • Model any surge protection device
  • Minimize wear and tear on pipes
  • Simulate any transient condition
  • Ensure the longevity of your water system
  • Prepare for power failures and minimize service interruptions

HAMMER lets you interface directly with WaterCAD and WaterGEMS and import data from EPANET, eliminating the need for time-consuming model building.

HAMMER is the industry’s #1 transient analysis and water hammer modeling solution according to a recent industry study. Learn more and find out about special savings on HAMMER during our Celebrating #1 promotion.

Protect your system with HAMMER
  • Prevent catastrophic failures
  • Design surge control measures
  • Reduce operation and maintenance costs
  • Eliminate costly over design
  • Minimize service interruptions
  • Accurately determine transient pipe forces

Learn more about the Features and Benefits of HAMMER

All the Technical Requirements you need to run HAMMER

Watch: HAMMER overview video clip


Who Uses
Who uses HAMMER What's New in HAMMER V8 XM?


Method of Characteristics

HAMMER uses the Method of Characteristics - the benchmark standard and unquestionably the most rigorous and robust algorithm for hydraulic transient flow analysis.

Algorithms like the Wave Plan Method (a.k.a. the Wave Characteristic Method) compromise the accuracy of solutions by only computing results at junctions. The Method of Characteristics computes results along the pipeline, accurately capturing critical changes that could otherwise be missed – remember, extreme pressures don’t always occur at system junctions or local high and low points.

Click here to see the risks involved with using a solution method like the Wave Characteristic Method that neglects to compute results at intermediate points along a pipeline.

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Hydraulic Component Modeling

Surge protection equipment: HAMMER contains the most comprehensive suite of surge control devices. The user can select from more than 20 devices and perform an unlimited number of operating scenarios to develop the most appropriate strategy for surge mitigation.

Protective devices include surge tank (open, spilling, one-way, orifice, variable area, differential), hydro-pneumatic tank with or without bladder, check valve, air release/vacuum breaker valves, surge anticipator valve, surge relief valve, rupture disc, and more.

Control strategies include increased pump/turbine inertia, realignment of pipe route and profile, pump/turbine operating schedules, valve operation strategy, placement of protection equipment, and more.

Hydraulic elements: HAMMER contains all the commonly used hydraulic elements found in pipeline systems, such as pipes, pumps, tanks reservoirs and valves.

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Transient Phenomena Modeling

HAMMER is capable of accurately simulating a full range of transient phenomena including some of the most computationally demanding situations like cavitation andcolumn separation.

It incorporates a sophisticated algorithm for calculating the formation of vapor cavities and tracking their movement and collapse, and its robust numerical engine seamlessly switches between rigid column mass oscillation and elastic theory.

This versatility enables you to model events ranging from slow surge flow to rapid transient events that produce pressure waves moving at sonic speeds.

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Model Building and Management

Layout: Build your network from scratch using simple drag-and-drop layout tools, or use the ModelBuilder tool to create a model automatically from virtually any data source (including DXF files, Shapefiles, databases and spreadsheets). Extract ground elevations directly from DXF files, Shapefiles, or LandXML surfaces using the TRex tool, and assign system demands automatically with LoadBuilder.

Scenario Management: Use HAMMER’s Scenario Control Center to organize an unlimited number of design, operation, and network topology scenarios, create solution scenarios on the fly, and compare results for better decision-making support.

Time-step flexibility: You have the choice to use HAMMER’s recommended time step or to input your own.

FlexTables: Use the completely customizable FlexTable system to accelerate the data input process and facilitate the review of results. Query the data with sorts and filters, perform global edits, and control presentation by customizing field labels and units.

Engineering libraries: Enter information once, use it many times by maintaining your own engineering attribute libraries for pumps, liquids, valves, and more.

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Built-In Steady-State Engine

HAMMER can compute the initial steady state conditions of your system prior to running a transient analysis, making HAMMER a complete, stand-alone, transient analysis solution.

The hydraulic solver used to compute initial conditions in HAMMER is the same as that used in the award-winningWaterGEMS  and WaterCAD software products.

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Transient Force Computation

Automatically compute the magnitude and direction of transient forces for each time step and analyze the results with graphical output.

Results can then be used in structural analysis programs to investigate the structural integrity of the pipe network.

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Turbine Modeling - Load Acceptance and Rejection

Hydraulic turbines and penstocks often operate under high pressure at steady-state. Rapid changes such as electrical load rejection, load acceptance or other emergency operations can result in very high transient pressures that can damage the penstock or equipment.

Using HAMMER, designers can verify whether the conduits and flow control equipment are likely to withstand transient pressures that may occur during routine operation, or during an emergency.

More specifically, HAMMER can model four different operational cases: instantaneous load rejection, load rejection, load acceptance and load variation.

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Reporting and Result Presentation

Color mapping: Clarify problem areas with color maps of maximum or minimum head, pressure, flow, or volume of air or vapor. Easily pinpoint areas of negative pressure, which may cause the ingress of contaminants. Visually correlate zones of high transient pressures with pipe-burst maps.

Animation: Generate interactive animation files for polished and powerful presentations. Start and stop the animation at any time and step through a vapor pocket collapse frame by frame or jump to a specific time step.

Flexible profile and graphs: Plot a transient history at any point in the system to display the spatial variation of parameters such as pressure and flow. Generate report-ready graphs by adding explanatory symbols and annotation and customizing appearance by controlling scale, line types, shading, and titles.

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Compatibility with WaterCAD and WaterGEMS

HAMMER data files are 100% compatible with WaterCAD and WaterGEMS data files. That means that a model created in WaterCAD/WaterGEMS can be opened directly in HAMMER with no conversion or translation required, and no data is lost.

Likewise, models created in HAMMER can be opened and edited in WaterCAD/WaterGEMS. Non-transient hydraulic simulations can also be performed in WaterCAD/WaterGEMS on files created in HAMMER.

In addition, HAMMER, WaterGEMS and WaterCAD share a common user-interface, and many common features – making it easy for a WaterCAD or WaterGEMS user to get up to speed with HAMMER.

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Multi-platform Support

HAMMER can run on any of four supported platforms -ArcGIS, AutoCAD, MicroStation, and stand-alone – offering users true interoperability without sacrifices. Enjoy full ArcGIS integration without losing the precision of a CAD platform, or the speed and simplicity of a stand-alone platform.

HAMMER allows your modeling team to collaborate without surrendering individual skills, maintaining a single modeling data set without platform restrictions.


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