Mobile tanks experience extreme fatigue: vibrations, pressure cycles, temperature swings, and mechanical shocks. EEMUA 158 mandates specific inspection intervals (typically 2.5, 5, 10 years, and beyond) to detect hidden cracking, corrosion, or weld defects before a leak or rupture occurs.
If you're interested in accessing a free summary or overview of the standard, I recommend checking out the EEMUA website or searching online for helpful articles and resources. eemua 158 standard pdf