Efficiently Identify, Manage, and Mitigate Transient Risks

Every time a pump or valve is operated, potentially dangerous transients are introduced in your water distribution or wastewater system. Unchecked, transients can have catastrophic consequences on your pipes and equipment, operators, and customers. Quickly identify critical points in the system that need protection and facilitate sound system design

What is OpenFlows HAMMER?

OpenFlows HAMMER helps you perform transient analysis and modeling in water or sewer systems to locate trouble spots and determine appropriate serge control strategies. OpenFlows HAMMER’s computationally rigorous engine and easy-to-use interface to efficiently identify, manage, and mitigate the risks associated with transients.

Quickly identify, manage, and mitigate the risks associated with transients

A transient analysis and water hammer software, HAMMER is the most cost-effective way to control transients. If left unchecked in a water or sewer system, transient pressures can cause catastrophic damage to pipes and equipment, risk the safety of operators, allow intrusion of dangerous contaminants into the system, and interrupt service to customers. Used successfully on high-profile projects around the world, HAMMER can identify critical points in the system that need protection and facilitate sound system design

Capture outcomes with a proven algorithm

You can compute results at intermediate points along the pipeline, accurately capturing critical outcomes (such as mid-pipe negative pressures) that could otherwise be overlooked. HAMMER uses the Method of Characteristics, a standard for hydraulic transient flow analysis

Superior interoperability

Out of the box, you can use HAMMER as a stand-alone application or work from within ArcGIS, MicroStation, or AutoCAD. Regardless of the platform used, HAMMER maintains a single set of modeling files for true interoperability across platforms.

Model building and management made easier

Build your network from scratch using simple drag and drop layout tools, or import your network data from EPANet. Alternatively, you can leverage geospatial data, CAD drawings, databases, and spreadsheets to jumpstart the model-building process. The included LoadBuilder and TRex modules help you allocate water demands and node elevations based on geospatial data to avoid potential manual input mistakes and streamline the model-building process. HAMMER also provides drawing and connectivity review tools to guarantee a hydraulically coherent model. If you are an OpenFlows WaterCAD or OpenFlows WaterGEMS user, easily open your models directly in HAMMER (or vice-versa), eliminating any import or conversion process.

A wide range of hydraulic components

HAMMER allows you to precisely simulate the impact of a wide range of surge protection devices and rotating equipment (pumps and turbines). Select from more than 20 devices and perform an unlimited number of operating scenarios to develop the most appropriate strategy for surge mitigation.

Comprehensive scenario management

HAMMER’s Scenario Management Center gives you full control to configure, run, evaluate, visualize, and compare an unlimited number of what-if scenarios within a single file. You can easily make decisions by comparing unlimited scenarios, analyzing surge protection alternatives, or evaluating pump and valve operation strategies.

Result interpretation tools

The analysis and data visualization tools in HAMMER allow you to capture fast-moving transient phenomena, determine their impact on the system, and select the most appropriate surge protection equipment for the job. Thematic mapping, interactive animations, and contour plots, and a host of report-ready graph and profile options provide the information required in a format that makes sense.


Interface and Graphical Editing
• Ability to run from within four compatible platforms:
o Stand-alone Windows
o ArcGIS (ArcMap license required)
o MicroStation (MicroStation license required)
o AutoCAD (AutoCAD license required)
• Element morphing, splitting, and reconnection
• Scaled, schematic, and hybrid environments
• Automatic element labeling
• Unlimited undo, redo
• Element prototypes
• User data extensions
• Aerial views and dynamic zooming
• Named views manager
• Multiple background-layer support
• Ability to track model changes by user, date, element, and more
• Ability to add online Bing Maps as background

Interoperability and Model Building
• Complete compatibility with WaterCAD/WaterGEMS
• EPANET import/export
• Spreadsheet, database, ODBC, shapefile, DXF and DGN file, geodatabase*, Geometric network*, and SDE* connections (*when running from within ArcMap)
• GIS-ID property to maintain associations between records in the data source/GIS and elements in the model
• Graphical SCADA element
• Customer Meter element
• Automatic demand allocation from geospatial data
• Geospatial demand allocation from customer meters and lump-sum geospatial data
• Geospatial-based water consumption projection
• Daily, weekly, monthly, and superimposed patterns
• Composite demands with global editing
• Area, count, discharge, and population-based loading
• Pipe-length-based demand loading
• Elevation extraction from DEM, TIN, shapefiles, CAD drawings, and surfaces
• Lateral link (no need to split pipes)

Model Management
• Unlimited scenarios and alternatives
• Active topology
• Global attribute tabular editing
• Sorting and persistent filtering on tabular reports
• Dynamic and static selection sets
• Customizable engineering libraries
• Global engineering units management
• Sub-model management
• Network Navigator for automatic topology review and connectivity consistency
• Automatic element validation
• Automated model skeletonization
• Orphaned nodes and dead-end pipes queries
• Complete flexibility for project options (pressure wave speed, liquid specific gravity and vapor pressure, and run duration)
• Support for ProjectWise®

• Methods of characteristics for transient analysis
• Wave speed calculator
• Built-in, steady-state, and extended period simulation engines
• Transient force computation
• Turbine modeling: load acceptance and rejection
• Many types of friction methods (steady state using Hazen Williams, Modified Hazen Williams, Darcy Weisbach or Mannings, quasi-steady, and unsteady friction methods)
• Rule-based or logical controls and Unsteady -Vitovsky
• Variable-speed pumping
• Transient analysis batch run

Results Presentation
• Thematic mapping
• Advanced dynamic profiling
• Contour plots
• Profile plots along a path
• Time history graphs at a point
• Synchronized maps, profiles, and point histories visualization
• Advanced tabular reporting with FlexTables
• Publishing of i-models in 2D or 3D, including to Bentley Map Mobile

Hydraulic Elements
• Ability to record AVI video of time analysis
• Reservoir
• Pump: shut down after delay, constant speed (no curve), constant speed (with curve), variable speed
• Turbine
• Pressure regulating valve
• Flow sustaining valve
• Loss element (including orifice)
• Sprinkler
• Check valves
• Gate valve
• Globe valve
• Butterfly valve
• Needle valve
• Ball valve
• User-defined valve
• Dead end
• Constant flow draw-off
• Periodic head/flow

Transient Sources
• Valve closure (including partial closure) and opening
• Pump, controlled shutdown, trips, startup
• Rapid demand change; rapid pressure change
• Multiple transient sources supported simultaneously

Surge Protection Devices
• Surge tank: open, spilling, one way, variable area, differential, with orifice, with bladder
• Hydropneumatic tank (sealed, vented, dipping tube)
• Pressure relief valve
• Surge anticipation valve
• Rupture disk