What is required to prevent oil from spreading beyond the confines of a heater in the event of a ruptured tube?

Dikes are essential for containing liquids, including oil, to prevent their spread in case of a rupture, such as a broken tube. They are generally constructed as barriers that can effectively hold back fluids, ensuring that any leakage is confined to a specified area. In the context of a heater with oil, dikes provide a physical barrier to mitigate the risk of environmental contamination and hazards associated with spilled oil.

Containment boxes, while useful in certain situations, are typically designed for specific equipment rather than as broad protective barriers. Oil traps can be effective for filtering or separating oil from other substances but do not necessarily contain the oil spread. Absorbent pads are helpful for cleaning up spills once they have occurred but do not prevent the oil from spreading in the first place. Thus, dikes are the most effective solution for the prevention of oil dispersal in this scenario.