When installing multiple fuel oil tanks with separate fill pipes, what venting requirement is not applicable?

When it comes to installing multiple fuel oil tanks with separate fill pipes, the venting requirement that is not applicable is the need to increase the vent pipe one size larger. This is because each tank has its own dedicated fill pipe and venting system, allowing for efficient ventilation without the need for enlarging the vent pipe size.

In installations with multiple tanks, each tank can individually release vapor and pressure, thereby negating the need to increase the size of the vent pipe. Such adjustments would typically be necessary in a single or common vent system where multiple tanks share the same venting, and increased capacity is needed to manage vapor flow adequately.

The other choices—common vent installation, individual venting for each tank, and vent pipe pressure testing—are applicable in certain circumstances. Common vent installations could be considered when tanks share a vent, but with individual fill pipes, each tank usually requires its own venting. Individual venting ensures that each tank operates safely and effectively, while pressure testing the vent pipe is a standard procedure to ensure its integrity regardless of the number of tanks. Therefore, the correct understanding is that increasing vent pipe size is not a requirement in this specific scenario.