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TT-36 Vibration analysis of kettle reboilers using Xvib

February 05, 2026

Component: Xist and Xvib  Date posted: 5 February 2026 HTRI recommends that all users with access to Xvib should use its analysis for any Xist warning messages regarding vibration, especially for U-tubes. Xist does not explicitly analyze vibration in U-tubes, and its results may be nonconservative. TT-35 addresses common Xist warnings about tube vibration in...
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• PARAMETRIC STUDY TOOL
• XVIB
• XIST
• VIBRATION
• KETTLE REBOILER

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Training case study: Vibration concern in U-tube reactor effluent cooler—beyond initial screening

September 08, 2025

Andy Mountford, Senior Technical Lead, Training Peter Joosten, Manager, Technical Support In this case study, a TEMA DEU heat exchanger design must cool high pressure reactor effluent from 180 °C to 40 °C. The corrosive reactor gas is assigned to the tube side, with cooling water on the shell side. The...
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• XVIB
• XIST
• VIBRATION
• TUBE LAYOUT
• HEAT EXCHANGER DESIGN
• CASE STUDY

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Goodbye to bad vibes: A comparison of HTRI's tube vibration analysis tools (Part II)

July 07, 2025

Andy Mountford, Senior Technical Lead, Training Peter Joosten, Manager, Technical Support In a previous article, we reviewed the differences between the Xist® and Xvib® vibration analysis methods for straight-tube heat exchanger configurations. These differences are summarized in the table below. Straight-tube method Xist Xvib Vibration mechanisms analyzed Fluidelastic instability, vortex shedding,...
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• XVIB
• XIST
• VIBRATION
• TUBE LAYOUT
• HEAT EXCHANGER DESIGN

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Training case study: Vibration concern in steam generator unit

May 12, 2025

A TEMA AES exchanger with carbon steel tubes produces 7.5 bar steam on the shell side with a weight fraction vapor of 0.3 at the shell exit (Figure 1). The operator has seen no evidence of tube damage in the operating unit, but the Xist vibration analysis flags fluidelastic instability (FEI)...
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• XVIB
• XIST
• VIBRATION
• TUBE LAYOUT
• CASE STUDY

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Goodbye to bad vibes: A comparison of HTRI’s tube vibration analysis tools

April 08, 2025

Most readers are aware that HTRI's shell-and-tube software, Xist®, includes an integrated analysis of flow-induced tube vibration. Why, then, does HTRI offer a separate tube vibration screening tool, Xvib®? In this article we review some key differences between the two programs and identify instances in which Xvib is the superlative vibration...
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• XVIB
• XIST
• VIBRATION

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Discover the enhanced power and innovative features of Xchanger Suite® 9.3

January 15, 2025

With more than 50 enhancements, Xchanger Suite 9.3 is a version you won't want to miss. Let us take you through some of the standout features that make this version truly exceptional. Method improvements We continually update the predictive methods in our software based on experimental data and analysis from our...
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• HTRILABS
• XVIB
• XIST
• XCHANGER SUITE
• XACE
• RESEARCH

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Noise, vibration, and … harshness?

December 04, 2023

NVH (noise, vibration, and harshness) is an increasingly important design metric for many commercial products—from vacuum cleaners and dishwashers, to lawnmowers and chain saws, to cars, trucks, and aircraft. Consumers demand a product that performs well but with low "observables." The first two qualities are measureable. A sound power meter can...
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• ACOUSTIC VIBRATION
• XVIB
• XIST
• VIBRATION
• SHELL-AND-TUBE
• HEAT EXCHANGERS

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TT-31 Beware of flow obstructions in inlet and outlet regions

February 14, 2023

Component: Xist, Xvib Date posted: 14 February 2023  Flow obstructions in the inlet and outlet regions can invalidate the Xist bundle entrance and exit velocities and thus impact the rho-V2 calculations. The Xist vibration analysis for shell and bundle entrance and exit areas is performed using the TEMA RGP-RCB-4.6.2 definitions. The...
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• SEAL STRIPS
• VIBRATION
• MECHANICAL DESIGN
• FLOW-INDUCED VIBRATION
• FLOW DISTRIBUTION
• XVIB
• XIST
• TECHTIP

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Getting Started: Building Your First Case in Xvib

September 28, 2022

If you're new to Xvib®, or simply need a refresher, this webinar will help you. The webinar provides an overview of how Xvib works so that you can use it to analyze the vibration potential—both fluidelastic instability and vortex shedding amplitude—of a specific tube in the bundle of a shell-and-tube heat...
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• XVIB
• GETTING STARTED

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Case Study: Thermal Rating and Vibration Assessment of Disk-And-Doughnut Exchangers

July 08, 2020

Download Case Study PDF SUMMARY A fabrication company thermally re-rated two existing disk-and-doughnut heat exchangers for new process conditions at their acid plant. HTRI conducted research that improved their understanding and ability to model disk-and-doughnut heat exchangers. THE CHALLENGE Analyze heat exchanger performance Assess the potential for excessive vibration Flow pattern...
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• DISK-AND-DOUGHNUT EXCHANGER
• VIBRATION
• XVIB
• XIST
• CFD
• CASE STUDY

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Beyond the Basics: Getting the Most Out of Xvib

January 30, 2018

Xvib® is an advanced tool for tube vibration study. This webinar discusses some specific aspects of Xvib inputs that can be adjusted for a more accurate vibration analysis....
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• VIBRATION
• XVIB

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STV-16 Calculating Fluidelastic Instability of U-Tubes Near Inlet Nozzles

January 16, 2017

The challenges of a rules-based vibration screening in Xist® have often led to excessive conservatism for U-tubes positioned near the inlet nozzle. In this study, we simulated shellside diabatic flow over the U-bend portion of the bundle for a number of nozzle locations using computational fluid dynamics (CFD). Using the simulation...
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• XVIB
• XIST
• VIBRATION
• CFD

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STV-15 Select Crossflow Velocity Distributions for Analyzing Tube Vibration Potential

January 16, 2017

Both the value and distribution of velocity along each span are important for proper assessment of tube vibration potential. Because of the disparity in spatial resolution between the small-scale finite element structural model of Xvib® and the larger scale incrementation scheme of Xist®, engineering judgment is required to populate the important...
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• XVIB
• XIST
• VIBRATION
• CFD

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