"罐顶支柱" can be translated as "roof support column (for tanks)" or simply "tank roof support" depending on the context and the level of specificity required.
"Roof support column (for tanks)" emphasizes the structural element that supports the roof of a tank.
"Tank roof support" is a more concise and commonly used term in many contexts to refer to the supports for the roof of a tank.
Choose the one that best fits your specific usage scenario.