February 6, 2019 Page 8
20190206 Addendum Questions _ File No. 3066.09
45.
46.
below ground backup rings are to be made of Carbon Steel while above grade
backup rings are to be made of Zinc-plated steel.
Recommendation: Please clarify backup ring, gasket, and hardware
requirements.
A revised specification will be included in Addendum #3 during the week of February
11, 2019. Please prepare bids as follows:
u All gaskets shall be Viton.
= Below-grade joint hardware shall be Type 304 stainless steel.
= Above-grade hardware shall be zinc-plated unless otherwise noted.
= Hot-dipped galvanized fasteners are not allowed.
# Convoluted stainless steel backup rings shall be used for joining HDPE pipes below
grade, and epoxy-coated carbon steel backup flanges shall be used above grade.
Reference: 15210, 3.2B.12.
Comment: Under Section 15210 Part 3.2 B-12 It is states “all interior butt fusion
weld beads shall be removed from the pipe {i.e., all HDPE pipe must be de
beaded) in accordance with the manufacturer’s recommendations”. Does this
include the debeading of all perforated pipe as well as the solid pipe?
Perforated pipe is not required to be debeaded.
Reference: 4” HDPE Force Main
Comment: Can you clarify the SDR of the force main. By default, it references
SDR 17.
Recommendation: Please clarify force main SDR.
The 4-inch diameter HDPE force main shall be SDR-17.
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