Warning Tapes. Provide buried warning tape for all
underground pipelines as required by the appropriate guide
Double-Wall Piping. Provide double-wall piping for
Ground Vehicle Fueling Facilities. For other applications,
provide double-wall piping only when required by state or
local regulations, or if specifically approved by DLA/DFSC.
Single-Wall Piping. As a minimum, for all single-
wall buried pipe, provide capability for future monitoring by
installing a perforated PVC pipe in trench with fuel pipe or
with some other system approved by Service Headquarters.
Provide 4-inch (100-mm) slotted PVC pipe in the same trench as
the fuel pipe and no greater than 3 feet (0.9 m) above the top
of the fuel pipe. Provide ASTM F758 pipe, type PS46 with
circumferential slots 1/32 to 1/8 inches (0.8 to 3 mm) and not
longer than 1-1/4 inches (32 mm) with maximum open area of 0.5
square inches/linear feet/1060 sq. mm/m). Wrap pipe in a
geotextile of nonwoven pervious polymeric material with an
apparent opening size (U.S. Sieve) of 70. Provide access
riser with cup every 100 feet along perforated PVC pipe.
UNDERWATER PIPING. To receive fuel from offshore
moorings, provide one or more underwater pipelines from the
shore facility to the mooring. Limit the design of these
systems to engineers with this type of experience.
Special Arrangements. At the mooring end of each
pipeline, provide lengths of submarine fuel hose equal to 2.5
times the depth at high water. At the pipe end of the hose,
provide a flanged removable section of hose 10 feet (3 m)
long. At the free end of the hose, provide a steel valve with
a marker buoy attached to a cable or chain which has
sufficient strength and suitable fittings for the vessel to
lift the hose and valve aboard.
Connections. Lay out multiple fuel lines and
connections so that they correspond to the layout of the
ship's discharge manifold.