25.03 How is piping designed for building risers?

Between fill piping, fuel supply and return piping to generators, and tank vent piping, routing of fuel piping within buildings is an important consideration. Most of the piping is routed vertically through risers, and layout and coordination with other building systems is an important consideration.

Fuel oil supply, return, and vent piping is typically double wall steel pipe with welded connections. Tank vent pipe is typically single wall piping.

Tank vent piping is an important consideration for fuel systems in buildings. In some locations emergency vents are required to be routed to the exterior of the building. For a double wall tank, this would be 2 pipes from 4” to 10” diameter. Added to fuel oil supply, return, and normal vent piping, this can be a considerable installation cost, and also take up a lot of space within the building.