What is the purpose of a remote fill pipe?

Remote fill pipes are provided for oil storage tanks sited in excess of 30m from a road, or where there is restricted access generally. For domestic installations this would generally take the form of a 50mm steel pipe connected to the tank and routed to an accessible position. The pipe should incorporate a screw cap at the fill point, a gate valve, a non-return valve and be adequately supported. Due to increased risk of spillage during filling process, the tank it serves should have secondary containment, such as an integrally bunded oil storage tank, and should be fitted with and overfill prevention device. An audible overfill alarm is also recommended.