Is ductile iron pipe listed for use in above ground applications? And is it intended for that usage? The pipe supplies both sprinkler and domestic water
Excerpt from 2106 NFPA 13:
The piping must be in accordance with Section 6.3. Have you looked at the product specs sheets from the piping manufacturer for your design? Does it meet the requirements of 18.104.22.168? I can't do the engineering for you. If not, you can't use it.
ASTM standards: ANSI/AWWA C151/A21.51 — American National Standard for Ductile-Iron Pipe, Centrifugally Cast, for Water. ANSI/AWWA C153/A21.53 — American National Standard for Ductile-Iron Compact Fittings, 3-inch through 24-inch and 54-inch through 64-inch, for Water Service
You could use DI aboveground as water service main piping. But MJ connections cannot be used aboveground, so your best joint options will be flanged or grooved. Also, steel pipe will be more economical and much more practical.
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