DUCTILE IRON PIPE
Ductile Iron also differs from Gray Iron in that its graphite form is spheroidal, or nodular, instead of the flake form found in Gray Iron. This change in graphite form is accomplished by adding an inoculant, usually magnesium, to molten iron of appropriate composition during manufacture.
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pe.mcwane.com§ AASHTO T-99, “Moisture Density Relations of Soils Using a 5.5 pound Rammer 12-in. Drop.” 150 300 400 500 700 30 45 60 90 150 0.235 0.210 0.189 0.157 0.128 E’ psi Bedding Angle degrees Kb x 0.108 0.105 0.103 0.096 0.085 FIGURE 1 Standard Laying Conditions for Ductile Iron Pipe Type 1* Flat-bottom trench.† Loose backfill. Type 2 Flat ...
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