1305.9.3 Horizontal offsets.
MC § 1305.9.3
Where it is necessary to make horizontal offsets in the fuel-oil piping and pipe shafts, including the lowest level, such piping shall be enclosed in a fully welded outer containment of at least No. 10 standard Gage steel. Exceptions: 1. The containment enclosure may be omitted on horizontal piping along the roof for a maximum length of 72 inches (1828.8 mm) from the enclosure, tank or the equipment served for hard piped connections and valves as required.
2.The containment enclosure may be omitted where a double metallic wall flexible fuel-oil piping system is installed as a horizontal offset, such pipe system does not need to be enclosed in an additional containment enclosure.
