Our company has a new article, Isentropic Effects - Application and Simulation, pending publication in a future issue of Hydrocarbon Processing in early 2021. On our Free Tools page, a calculator is provided to input values for equations used in this article. If you are interested in learning more about this topic, please contact us.

From the Isentropic Effects - Application and Simulation article, you can observe the crude vacuum tower overhead line downstream of the vacuum ejector experience the isentropic effect. To view the video, click the download button below (warning: works for PC only).

Other articles on PSV fixes and more are in progress with hopes of future publishing in 2021.


We set up Process Engineering Pop Quizzes on LinkedIn in various forums, including Process Engineering, Oil & Gas Professionals, AIChE, GPA Rocky Mountain, and others.  Follow our LinkedIn button at the bottom of the page and check out the past ones.  We will compile all of the quizzes over time and publish an e-book with these quizzes for use in academia or in training for workplaces.


Feel free to comment on the LinkedIn forums and help others out.  We post the answers after a few days of commentary allowed by everyone.


Quizzes may have repeat numbers and be ordered non-numerically; there is no correct or specific way that the quizzes were numbered or ordered.

We will set up the pop quizzes here on this website over the next couple of months and redirect conversations here.  Thanks for the participation. 


NEWEST POP QUIZ 20-02 HERE: Pump Dead Head Calculations

Quiz 20-01: Significant Impacts to Fin Fan Condensers (Optimization and Design Considerations)

Quiz 2020-01: Underground Cavern Troubles

Quiz 19-10: Rail Car Unloading Considerations

​Quiz 19-03: Why pilots go out when steam valves are opened to a flare tip.

Quiz 19-1: Hydrotest and Commissioning

Quiz 18-Final: Overfill / Overpressure protection on tower with 2 phase feed

Quiz 18-10: FEL-1 Shortcut Exchanger Sizing

Quiz 18-9: PSV "Quick Hit" Questions for Industry Software Warnings

Quiz 18-8: Water Slides Pressure Gradient for 2 phase flow / Flow Assurance Downhill

Quiz 18-7: Thermosiphon Reboiler Design Detail / Operators know best

Quiz 18-6: Backfiring Flare (Ka-PoW!)

Quiz 18-5: Steam Condensing in Flare Headers

Quiz 18-4: What's the Coldest Temperature Possible? How not to set up Piping Design for Failure

Quiz 18-3--Tricking Steady-State Simulators to Model Dynamic Situations

Quiz 18-2: Fire at control valve--Possible Root Causes?

Quiz 18-1: The "monster" pump breathes fire

Quiz 18-0: Engineering Mentors

Quiz 10-2: Temperature Inversion on Control Valve Outlet

Quiz 10-1: Technical Interview Questions

Quiz 8-1: What belongs on your P&ID?

Quiz 6-1: Contaminated Nitrogen Bottles

Quiz 5-1: Will my steam trace freeze?

Quiz 4-1: Latent Heat Determination (PSV's & Equipment Design)

Quiz 3-1: Tube Rupture

Quiz 2-1: Oil Field PSV

Quiz 1-3: Liquid Pipeline Design

Quiz 1-1: Simulation vs. Real Life

Quiz 12-01: Quick Hit Questions

Quiz 11-2: Pressure Drop Affinity Law?

Quiz 11-1: Exchanger Design / Retrofit

Quiz 11-1--Dynamic Flow in Low-Pressure Gas Line

Quiz 10-1: Flare Modeling Software "Adjustments" Needed?

​​Quiz 9-1: Flare Headers

​​Quiz 8-4: MOC Review for Vessel Design

Quiz 8-3: PSVs to Flare Header for Global Cases

Quiz 8-2: Heater Treater Internals Causing Tank Emissions?

Quiz 8-1: Heater Treater Simulation

Quiz 7-2: PSV Relief Sizing

Quiz 7-1: Heat Exchanger Design

Quiz 6-1:  Cavitation issues discussed on water control valves

Quiz 6-2:  Depropanizer Heat Integration Pop Quiz (see link for picture) 

Quiz 6-3:  Are you Really Maximizing Use of Tanks?

Quiz 6-4:  Validating Pump Flow