k) Join glass FRP piping by bell and spigot joints
sealed with adhesive, except use FRP flanges for connections
to flanged equipment such as pumps or valves. Ensure that no
loading can be transferred from steel piping to FRP piping.
l) Make fittings and flanges for aluminum piping of
the same material as the pipe.
INTERIOR PIPE COATINGS. To protect aviation fuel
quality and extend the life of the piping, minimize bare
carbon steel piping (except interterminal pipeline) which
comes in contact with aviation turbine fuels especially
downstream of initial filtration equipment and maximize the
use of internally coated pipe. This is not intended to allow
the use of lined carbon steel piping as a substitute for areas
requiring non-ferrous piping. Comply with other paragraphs of
this section for material selection. Interior pipe coating is
not required on non-aviation piping except for carbon steel
piping within the lower 36 inches (900 mm) of aboveground
vertical storage tanks, and ballast lines on piers.
EXTERIOR PIPE COATINGS
a) Protect the exterior surfaces of all underground
b) Protect the exterior surfaces of all aboveground
applicable service requirement.
c) Coat underwater piping with the same materials
used for underground piping.
SAMPLING FACILITIES. Provide connections for
sampling fuels on each section of a fuel transfer piping
system. Install sampling and testing connections at receiving
points, tank outlets, inlet and outlet sides of
filter/separators and fuel monitors, all fuel dispensing
points, and between block valves so that the remaining fuel in
each portion of a fuel transfer pipeline can be sampled.
Where possible, install sampling connections in vertical runs.
Provide a 1/4-inch (6 mm) diameter sample point with a probe,