minimum design & construction standards - Martin County, Florida

Joints for ductile iron pipe shall conform to the latest standard of ANSI/AWWA C111/A21.11
for rubber gasket joints. Protecto 401 lined ductile iron pipe shall conform to the latest
standards of ANSI/AWWA C104/A21.4
Above ground ductile iron pipe shall be Protecto 401 lined flanged Pressure Class 53 with
minimum wall thickness of 0.32 for 4-inch pipe and incremental increases of 0.02” thickness
for each pipe diameter increase up to 14-inches. Ductile iron pipe greater than 14-inches
shall be submitted to the Department.
All above ground DIP shall be coated with green paint as follows:
Sandblast and remove all paint and any loose material in accordance with SSPC SP-10.
Sandblasting shall be performed using non-silca media. Do not paint or coat any
nameplates, brass or stainless steel surfaces. Contractor shall use the following paint system
or approved equal.
TNEMEC
1) Primer: TNEME-ALUMINUM MASTIC #135
(3.0 to 5.0 mils DFT)
2) Intermediate Series 66 Epoxoline
Coat: Hi-Build Epoxy
(4.0 to 6.0 mils DFT)
3) Finish Series 73 Endura-Shield III
Coat: Urethane
or equal (2.0 to 3.0 mils DFT)
Flanged fittings shall meet ANSI 21.20 and AWWA C110 standards.
All fittings shall be epoxy lined.
Pipe joints to be push on. The use of ductile iron pipe shall be allowed only where
individually approved on a case by case basis.
3. Parallel/Horizontal Separation
Sanitary sewers, force mains, and storm sewers should cross under water mains whenever
possible. Sanitary sewers, force mains and storm sewers crossing water mains shall be
laid to provide a minimum vertical distance of 18 inches between the invert of the upper
pipe and the crown of the lower pipe whenever possible.
Where sanitary sewers, force mains and storm sewers must cross a water main with less
than 18 inches vertical distance, both the sewer and the water main shall be constructed of
ductile iron pipe (DIP) at the crossing. (Storm sewers are not required to be DIP.)
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