Visual: All underground piping and joints must be uncovered and exposed, with labeling of the pipe legible from grade. All thrust blocks will be visually inspected and must be uncovered and exposed to grade. Depth of bury of the pipe shall be measured and verified. all ductile iron, retaining rids, and other non-plastic components shall be externally cited for corrosion and poly wrapped.
Hydrostatic Test: Underground piping will have to have passed the visual inspection. The test will be at 200 psi or at 50 psi in excess of the maximum static pressure when the maximum static pressure exceeds 150 psi, for a minimum of 2 hours. Testing to be from the gate valve to the top of the spigot, no pressure drop or gain allowed.
Flush: upon completion of the underground hydrostatic test, the underground piping will be flushed, witness by the Fire Department. Proper methods and equipment to perform the flush must be used.
The flushing must be completed prior to stacking the riser to the overhead piping.
Piping under driveways shall be buried a minimum of 3 ft, 24:10.4.4.
Note: The depth of cover shall be measured from the top of the pipe to finished grade, and due consideration shall always be given to future or final grade and nature of soil, 24:10.4.6.
Received NFPA 24 Underground Acceptance paperwork.