Pressure frost damage

Different theories have been put forward to explain the mechanism of frost damage. The most important are the theory of hydraulic pressure and the theory of ice overpressure. 

EN-GJS-400-15, 0.7040 Eor waste waters containing chemicals that are not aggressive without abrasive solids when pressurised components are subjected to pressure surges or if there is a risk of frost damage... 

First-time users of large commercial Dewar flasks should develop an understanding of what is normal - lines that are pressure relief lines may frost over and it is normal for these tanks to hiss as pressure is relieved. These large tanks are very heavy and are susceptible to tip over if tilted at too steep an angle. Hand rolling these tanks is an unsafe practice and can damage the internal structure of the tank, resulting in rupture of the inner flask. Furthermore, because of the heavy contents, tip over is a real... 

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