minimum design & construction standards - Martin County, Florida

A minimum 5 foot horizontal separation, pipe center to pipe center with a minimum 3 foot
pipe wall to pipe wall shall be maintained between any type of sewer and reclaimed water
main in parallel installations whenever possible.
In cases where it is not possible to maintain a 5 foot horizontal separation, the reclaimed
water main must be laid in a separate trench or on an undisturbed earth shelf located on
one side of the sewer or force main at such an elevation that the bottom of the reclaimed
water main is at least 18 inches above the top of the sewer.
Where it is not possible to maintain a vertical distance of 18 inches in parallel installations,
the reclaimed water main shall be constructed of DIP and the sewer or the force main shall
be constructed of DIP (except storm sewers) with a minimum vertical distance of 12 inches.
The reclaimed water main should always be above the sewer. Joints on the reclaimed
water main shall be located as far apart as possible from joints on the sewer of force main
(staggered joints).
All DIP shall be Pressure Class 350 or higher. Adequate protective measures against
corrosion shall be as determined by the design engineer and the Department.
Horizontal separation of 15 feet to buildings, top of banks of lakes and canals and other
structures shall be maintained, if possible. An absolute minimum of 10 feet may be allowed
only when unavoidable and only with DIP.
5. Layout
Permanent dead ends will not be approved unless they are reasonably unavoidable. Dead
ends shall be equipped with a blow-off for flushing purposes. Temporary dead-ends shall
have a gate valve with a mechanical joint plug. The gate valve shall be mechanically
restrained for two full joints of pipe.
Reclaimed water mains should be placed in right-of-way whenever possible. Placement of
the water main on or adjacent to interior property lines or between structures is
discouraged and will be approved only when unavoidable or when necessary for looping.
6. Reclaimed Water Main Material
PVC reclaimed water mains 4 inch to 12 inch diameter (4" - 12") shall be DR-18
manufactured to ductile iron pipe outside dimensions and in compliance with AWWA
Standard C900. The pipe shall have an integral bell end and gasket seal with the joint in
compliance with the requirements of ASTM D3139. The pipe color along with all
associated appurtenances shall be Purple Pantone 522. Smaller diameter service lines
(1/2” through 3”) shall be Polyethylene Pressure Pipe and Tubing or PVC (schedule 40)
and shall be manufactured in compliance with ANSI/AWWA C901, PE 3408, PC 200 and
DR9. The pipe color shall be Purple Pantone 522 or co-extruded Purple Pantone 522 color
stripes.
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