Determination of VC is too complex for simple calculation.
Therefore, for the conditions where T > TC, use a computer
ABOVEGROUND PIPING. Support aboveground piping so
that the bottom of the pipe is a minimum of 18 inches (450 mm)
above the ground surface or higher if required to service
valves and equipment. In areas subject to flooding, greater
clearance may be desirable. At intersections with roadways,
allow enough clearance for the passage of tank trucks, cranes,
and similar heavy vehicles. In areas subject to seismic
activity, provide the piping configuration and support in
accordance with the seismic design criteria in Army Corps of
Engineers TI 809-04, Seismic Design for Buildings. Refer to
Corps TM 5-852 series for considerations in extremely cold
climate. Wherever possible, arrange piping in parallel groups
to facilitate multiple use of supports, to minimize the amount
of trenching for underground piping, and to minimize the
number of pipe stiles needed. Consider constructability and
maintenance in spacing of piping.
Identification. Identify piping in accordance with
Section 2 of this handbook. In addition, mark fuel lines at
head of fueling pier near valves.
Pipe Supports. Rest piping on supports, both
insulated and uninsulated, on a steel shoe welded to the
bottom of the pipe. Leave the shoe free to move on the
support. Construct the portion of pipe supports in contact
with the ground with concrete. Facility Plate Nos. 021 and
022 show the design of typical "slide/guide" pipe supports.
Ensure that support material is the same as the pipe material.
Do not weld a shoe to Schedule 10 stainless steel pipe. Other
support configurations are acceptable provided the support
does not contain rollers and does not allow movement of the
applicable requirements of ANSI/ASME B31.3 or ANSI/ASME B31.4.
Arrangement. Arrange pipes to provide for expansion
and contraction caused by changes in ambient temperature.
Where possible, accommodate expansion and contraction by
changes in direction in piping runs, offsets, loops, or bends.
Where this method is not practical, use flexible ball joint
maintaining alignment on each side of the expansion joint. Do