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Steady State
Incompressible Flow Modeling

Streamline & Organize. 
New Analysis Set-up | Revised Library Manager 
Multi-Scenario Graphing  |  Extensive Excel Capability
... and much more!

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Gas & Steam Transient Analysis
Introducing xStream™

Don't Guess. Rigorously Evaluate and Solve.
Gas and steam transient analysis in piping can be more precise, and reliable, than you ever thought possible...

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Steady State
Compressible Flow Calculations

Import More. Export Better.
Model Real Gases | Simulate Sonic Choking 
Utilize NIST REFPROP  |  Extensive Excel Capability
... and much more!

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Pipe Flow Modeling Software for Engineers

Our pipe flow modeling software is used to analyze piping
and ducting systems in over 115 countries to help engineers
design safer, more efficient systems and solve operational problems.

Incompressible
Pipe Flow

Fathom is used to calculate pressure drop and flow distribution in liquid and low velocity gas piping and ducting systems.

Compressible
Pipe Flow

Arrow is used to calculate pressure drop and flow distribution in gas piping and ducting systems.

Waterhammer & Surge Analysis

Impulse is analysis software used to calculate pressure surge transients in liquid piping systems caused by waterhammer. 

Steam and
Gas Transients

xStream is a powerful fluid dynamic simulation tool for high-speed, acoustic transients that occur in steam and gas piping systems. 

Dynamic solutions for a fluid world™

Find us in 115+ Countries

Since 1994, our 42 Channel Partners have helped engineers in over 115 countries design and troubleshoot flow within their piping systems. For steady-state or transient, compressible or incompressible, our suite of software provides the pipe flow modeling software tools engineers trust.

Case Studies

“The plant validation simulation in Fathom opened up avenues for possible improvements which were inconceivable solely based on plant data analysis.”

- Santosh Kumar and Swapnil A Paingankar, Ingenero Technologies

Read: Fathom Revealed and Resolved Capacity Limiting Issues in Petrochemical Cooling Water NetworkRead: Fathom Revealed and Resolved Capacity Limiting Issues in Petrochemical Cooling Water Network

“In light of the results of this study, Impulse has proven to be a robust and highly reliable software to perform surge analyses.”


- David Lozano, AQUATEC (SUEZ)

Read: Impulse Matches Data For Pumping Station Check Valve ClosureRead: Impulse Matches Data For Pumping Station Check Valve Closure

The process fluid mixture was created from the built-in NIST REFPROP database, and its properties were verified against Aspen HYSYS.

- Sumit Sayankar, L&T Technology

Read: Arrow Ensures Proper Fan Sizing in Nitrogen Closed LoopRead: Arrow Ensures Proper Fan Sizing in Nitrogen Closed Loop
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