D100 or Section 9 of AWWA D103. Mill and shop inspections [are not
required] [are required and shall be performed by an approved commercial
inspection agency]. The Contractor shall perform the radiographic
inspections of the welded tank shell, the hydrostatic test and the vacuum
box leak test of the tank bottom. Final hydrostatic and leak tests shall
be performed before painting of welded tanks.
3.7
PIPING INSTALLATION (EXCEPT FOR OVERFLOW PIPING)
3.7.1
General Guidelines
Where details of fabrication or installation are not shown on the drawings,
installation shall conform to Section 1 and 3 of AWWA C600.
3.7.2
Testing of Valves and Piping
After the [elevated tank] [standpipe] [reservoir] has been erected and the
valves and piping installed, and before field painting is begun, the valves
and piping shall be hydrostatically tested in accordance with Section 4 of
AWWA C600. The Contractor shall replace with sound material any defective
material disclosed by the pressure test, and the test shall be repeated
until the test results are satisfactory.
3.7.3
Polyethylene Encasement of Underground Ductile-Iron Piping
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NOTE: Appendix A of AWWA C105 will be utilized in
determining whether polyethylene encasement should
be used.
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Polyethylene encasement of underground ductile-iron piping shall be
provided in addition to asphaltic coating in accordance with AWWA C105.
3.7.4
Plugging Ends
Pipe ends left for future connections shall be capped or plugged as
directed.
3.8
PAINTING AND COATING OF TANK
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NOTE: Some state and local health agencies have
listings of acceptable paint materials to be used
for the interior of potable water tanks and to be
used on the exterior of structures. As an example,
the State of California will not allow vinyl paints
to be applied due to air emission restrictions. The
designer must contact the appropriate state and
local authorities to determine if the paint systems
are acceptable. If these systems are not
acceptable, the designer must determine the best
acceptable system and revise this specification
accordingly. However, any deviation from this
specification and AWWA Standards must be submitted
with justification to CEMP-ET for approval.
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Each coating manufacturer's technical data, application instructions,
SECTION 13209
Page 18
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