Because in the real world, it usually does. Have you run crack scenarios in PHAST? Share your findings or questions in the comments below.
Unlike a "guillotine break" (where a pipe snaps in half), a crack is insidious. It starts small, but due to pressure and stress, it can propagate rapidly. The question PHAST answers is: What happens when that crack grows just a few millimeters? One of the most powerful (and often misunderstood) features of PHAST is its leak frequency module (often used with LEAK or RiskCalc). Standard QRAs often assume round holes (1/4”, 1”, 4”). But real-world failures are rarely perfect circles. dnv phast crack
Most legacy studies use round holes because they are conservative for release rate but not always for consequence . For toxic gases (like H2S or chlorine), a crack's directional jet can send a plume directly toward an air intake that a round hole might miss. Because in the real world, it usually does
How to use PHAST not just for compliance, but for predicting the unpredictable. Unlike a "guillotine break" (where a pipe snaps
No, this isn’t about a flaw in the software. It’s about a critical physical phenomenon that PHAST helps us understand—and one that too many engineers overlook until it’s too late.
PHAST can help validate LBB strategies. If your crack model shows that the leak will be detected (via gas detection or pressure drop) before the crack reaches critical size, you can avoid a catastrophic rupture. If the model shows the opposite, you need better inspection intervals.