Where economically feasible or required by special
conditions, cast iron soil pipe meeting the
requirements of ASTM A 74 may be used for culverts
and storm drains. The pipe class, the type of
joint, and installation procedures should be as
specified in Section 02531 SANITARY SEWERS and
Section 02532A FORCE MAINS AND INVERTED SIPHONS;
SEWER.
Refer to the appropriate NAVFAC Design Manual on
storm drainage for general information on suitable
piping materials. Additional information may be
obtained from the "Life Cycle Cost for Drainage
Structures," Technical Report GL-882-2 by the U.S.
Army Corps of Engineers. Pipe materials which are
known to be unsuitable for local conditions (i.e.,
corrosion, root penetration, etc.) should not be
permitted for the project. However, consideration
should be given to use of more effective protective
coatings and jointing methods where economically
feasible.
In areas where problems with root penetration are
anticipated, specify pipe which has the kind of
joint which will successfully resist root
penetration. Generally speaking, the more
watertight the joint, the greater will be the
resistance to root penetration. Rubber-gasketed and
compression-type joints are considered to give the
best performance for this application.
American Society of Civil Engineers (ASCE) Manual
No. 37, "Design and Construction of Sanitary and
Storm Sewers," contains methods of calculation for
structural requirements of pipe; from these, the
required strengths for pipe of various materials may
determined. Investigate external loads, including
earth loads, truck loads, seismic loads, and impact,
in the design stage of the project. Give special
attention, in the design stage of the project, to
plastic pipe materials, particularly with respect to
superimposed external loads which could cause
excessive deflection of the pipe. The degree of
sidefill compaction should be considered
realistically, particularly in marginal cases. See
also the appendices to ASTM D 2321.
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Pipe for culverts and storm drains shall be of the sizes indicated and
shall conform to the requirements specified.
2.1.1
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NOTE: The various classes designate different
D-loads. D-load is defined as the minimum required
three-edge test load on a pipe to produce a 0.01
inch crack and/or ultimate failure in pounds per
linear foot per foot (no metric definition) of
SECTION 02630
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