A certificate signed by a registered professional engineer,
providing the following information:
a. Description of the structural design loading conditions used
for the design of entire tank including the foundation.
b. Description of the structural design method and codes used
in establishing the allowable stresses and safety factors applied
in the design.
c. A statement verifying that the structural design has been
checked by experienced engineers specializing in hydraulic
structures.
d. A statement verifying that the detail drawings have been
checked by experienced engineers specializing in hydraulic
structures to determine that they agree with the design
calculations in member sizes, dimensions, and fabricating process
as prescribed by applicable ACI and AWWA standards.
1.3
GENERAL REQUIREMENTS
1.3.1
Design and Construction Standards
**************************************************************************
NOTE: When required by the corrosive nature of
stored water, lack of proper maintenance facilities,
or by climatic conditions, this paragraph will be
modified to provide for a corrosion allowance.
Determine basic wind speed for use with ANSI
procedure from ANSI,UFC 3 310-01 LOAD ASSUMPTIONS
FOR BUILDINGS or TM 5-809-6 STRUCTURAL DESIGN
CRITERIA FOR STRUCTURES OTHER THAN BUILDINGS. The
choice between the ANSI and AWWA procedures allows
the supplier to provide a tank using the AWWA
approach up to the point at which the ANSI procedure
will provide the greater pressure. (This usually
occurs with a basic wind speed around 145 km per
hour (90 miles per hour), depending on the height of
the tank.)
Use 1200 Pa (25 psf) snow load for most heavy snow
climates; delete snow load where maximum snow is
insignificant. In some cases, local climate and
topography will dictate that a value greater than
1200 Pa (25 psf) be used for snow loading. This may
be determined from UFC 3 310-01.
Provide seismic requirements for tank related
equipment supports, if a Government designer is the
Engineer of Record, and show on the drawings.
Delete the inappropriate bracketed phrase. Sections
13080 and 15070A, properly edited, must be enclosed
in the contract documents. NAVFAC P-355, "Seismic
Design for Buildings," does not allow the use of
pedestal type elevated tanks in areas of moderate
and high seismic activity, so use only elevated
SECTION 13209
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