New Features & Enhancements 2025
Fathom 14, Arrow 11, Impulse 11 and xStream 4 incorporate 40+ new features and enhancements to make modeling liquid and gas system analysis more efficient.
New Features in all Four Products
Parametric Study
A/F/I/X
A powerful new tool to perform parametric studies
Estimated and Variable Heat Transfer Coefficient
A/F/I/X
Options to allow greater flexibility in Physical (NTU) Model heat exchangers by enabling users to define heat transfer coefficients based on system conditions or inputs
Cross-App Heat Exchanger Thermal Link
A/F
Solve heat balance for a liquid-gas heat exchanger by running Fathom and Arrow simultaneously
Pipe Filling and Draining
(Impulse Only)
Pipes can start out dry and be filled over time or the other way around. This is a great tool to analyze sprinkler systems or other piping which starts out dry.
Pipes can start out dry and be filled over time or the other way around. This is a great tool to analyze sprinkler systems or other piping which starts out dry.
Scenario Comparison Layer
A/F/I/X
Compare Scenarios as a graphical representation on the Workspace.
Compare Scenarios as a graphical representation on the Workspace.
Graph Annotations
A/F/I/X
Ability to add graphs to the Workspace which will update after the scenario is run
Design Alerts or Events Can Halt a Transient Run
(I/X)
Stop a run but keep the output. Traditionally a run is stopped at a certain time. Now you can define a Design Alert or an Event to stop the run if either occurs. The output will be maintained just as if the run was stopped at an ending time.
Stop a run but keep the output. Traditionally a run is stopped at a certain time. Now you can define a Design Alert or an Event to stop the run if either occurs. The output will be maintained just as if the run was stopped at an ending time.
Automatic and Specified Time Step Sectioning Modes
(I/X)
Automatic sectioning will automatically select a section count that meets the specified variance - no interaction with the sectioning panel necessary. For advanced users, a time step can be specified directly which can help strategically sacrifice accuracy for shorter run times.
Automatic sectioning will automatically select a section count that meets the specified variance - no interaction with the sectioning panel necessary. For advanced users, a time step can be specified directly which can help strategically sacrifice accuracy for shorter run times.
New Features Webinar
Learn about the exciting new features of our newest version releases for Fathom, Arrow, Impulse, and xStream! Join us as we explore the enhancements designed to improve your experience, boost productivity, and streamline your workflow. From user-friendly interfaces to powerful new tools, we’ll guide you through each feature.
Other features to look forward to
Improved PCF Importing (A/F/I/X)
Better control on how the elements of a PCF file will be imported to the Workspace including welded junctions, pipe length units, pipe materials, multiple PCF files.
Design Alert Layer (A/F/I/X)
Show Design Alert status on the Workspace.
Scenario Comparison Layer - Compare Scenarios as a graphical representation on the Workspace
Scenario Comparison Layer - Compare Scenarios as a graphical representation on the Workspace
Global Junction Morph (A/F/I/X)
Morph multiple junctions at once.
Control Valve Sizing Tool (F&A)
Use a Control Valve to size a Valve or Orifice, then automatically change the junction type while keeping the pressure loss value.
New Loss Models (A)
For Inline Flow Coefficients (Cd) in Orifice and Venturi
Improved Reciprocating Pump (I)
Allows selection from single/double acting, multiple cylinder arrangements, crankshaft phase offset, and estimated or user specified valve timing
PFA Force Amplitude vs. Frequency Graph (I/X)
Ability to create a Force vs Frequency graph (or “shaking force”) for selected Force Sets in the Impulse and xStream PFA Add-on Module.
PFA Workflow Improvements (X)
Ability to create a Force vs Frequency graph (or “shaking force”) for selected Force Sets in the Impulse and xStream PFA Add-on Module.
General Layer Improvements
- Consolidate Label and Object visibility controls
- Vary pipe thickness based on diameter
- Ability to create layer from current Output Control settings
- Easily select annotations to include/exclude in specific scenarios
- Quickly create Layer Folders
- Save and Load your layer definitions in files to standardize how your company presents models
Library Improvements
- Save Libraries in custom locations other than the Local User Library
- New IPS and DIPS HDPE Piping Material Libraries from ASTM F714
Output Grid Improvements
- Selection Calculations - Count, Numeric Count, Max, Min, Sum, and Mean will be displayed for selected cell
General UI Improvements
- Exclamation mark indicates missing data in the Analysis Set-up and Property Menus
- Display XTS Time Step in Solution Progress Window
- Faster loading / more responsive Workspace - 90% faster!
General Modeling Additions and Improvements
- Password Protection for Read-Only Files or Scenarios
- Clarified Detailed Tee Behavior with new auto-sync option
- Allow Specification of Backup File Directory
Expanded the ability to import PNGs as background images - NFPA Report can now be Copy/Pasted to Excel
Miscellaneous
- Improved Valve Characteristic percentage increments to whole numbers
- Improved monetary conversion example in the costing window
Learning Center