Section 6 B.  Installation

SECTION 6 WATER DISTRIBUTION

1.01 

 A. All ductile iron pipes shall be installed true and straight in accordance with ANSI/AWWA C 600 latest revision. Allowable pipe deflection shall not exceed 50% of the maximum deflection, as recommended by the pipe manufacturer.

     B.  Detector Tape:  All pipes shall have 3″ wide blue detector tape for water main.  The words “CAUTION WATER LINE BURIED BELOW” on the upper side of the pipe shall be printed at 30″ intervals along the tape.  Tape shall be placed 18″ below grade above all water mains and services or as recommended by manufacturer. Non-metallic tape shall be used above ductile iron pipe.  All PVC Mains shall be installed with a 14 gauge multi-strand copper wire locator system compatible with the Schonstedt MAC-51Bx pipe and Cable locator, or City approved equal. Wire to be strapped to pipe at maximum 10ft. intervals and the wire is to be brought up at each valve box, leaving and excess length of four (4) feet of wire coiled at each valve. At the water main pressure test, a continuity test shall be performed by the Contractor. The Continuity test shall be witnessed and approved by the City’s Representative and Engineer-of-Record.

    C. Bedding and initial backfill shall be in accordance with approved City of Miami Beach  detail.

D.    Ductile Iron Pipe and PVC pipes shall be laid with minimum vertical cover of 36 inches below finished grade, on City and FDOT roads.  The minimum vertical cover over Ductile Iron and PVC pipes on Miami-Dade County roads shall be 48 inches.

E. Minimum water service pipe to be installed from the water main to the meter is to be a two (2) inch diameter polyethylene line. Polyethylene water service line connections to the water main (both for  new and existing water mains) shall be VIA a double strap stainless steel saddle with corporation  stop.  Ductile iron pipe service and fire line connections (three (3) inch and larger) to existing water              mains shall be VIA a tapping saddle and valve, with the valve contained in a valve box.  Ductile                    iron pipe service and fire line connections (three (3) inch and larger) to new water mains shall be                 VIA a tee and a gate valve, with the valve contained in a valve box, on the branch line off the                        water main.

F. Pipe and accessories shall be carefully lowered into the trench by means of derrick, ropes, belt slings, or other authorized equipment.  Under no circumstances shall any of the water-line materials be dropped or dumped into the trench.  All pipe, fittings and accessories shall be encased in Polyethylene tubing ( 8 mil) thick.

G. Care shall be taken to avoid abrasions of the pipe coating.  Except where necessary in making connections with other lines, pipe shall be laid with the bells facing in the direction of laying.  Defects in coating are to be field repaired.

H. The full length of each section of pipe shall rest solidly upon the completed pipe bed, with recesses excavated and shaped to accommodate bells, couplings, and joints. Pipe that has the grade or joint disturbed after laying shall be taken up and re-laid. 

I. Water main connection shall not be made to the City’s main unless water in the trench at the connection point is at least 6″ below the bottom of the pipe. When work is not in progress, open end of pipes, fittings, and valves shall be securely closed with polywrap or Filter Fabric so that no trench water, earth, or other substance will enter the pipes or fittings.   Where any part of the coating or lining is damaged, the Contractor shall repair the damaged coating or lining in a satisfactory manner at his expense. Pipe ends left for future connections shall be valved, plugged or capped, and properly restrained.

J. City oversees connection between the old and new pipes and makes all wet taps on existing piping.  Size to size taps is not allowed unless approved by the City Engineer.  Tapping sleeve glands shall be tested and pass a pressure test of 120 psi for 2 hours before the pipe is tapped.

K. City to make all wet taps on existing piping and operate all existing valves.

2.02 Restraining

A. All pipes shall be internally restrained. Pipe to fitting, valves and accessories shall be by internal restraining and external stainless steel restraining rods for the first joint.  Thrust blocks are not allowed unless specially approved by Public Works Engineering in writing.

B. All fittings and specific pipe joints shall be restrained as outlined below (NO SUBSTITUTIONS):

 JOINT    RESTRAINT

 Push-On PVC   EBAA Iron Series 2800 Harness

 Push-On DIP   TR-Flex by U.S. pipe or Flex Ring by

     American; or EBAA Iron Series

     1700 Megalug

 Fitting with DIP pipe  EBAA Iron Series 1100 Megalug

 Fitting with PVC pipe  EBAA Iron Series 2000 Megalug

2.03 Setting of Valves and Boxes

    A. Install where shown or specified, and set plumb.  Valve boxes shall be centered on the  valves and set plumb at finish grade.  Boxes shall be installed over each gate valve  unless otherwise shown.

    B.  Where feasible, valves shall be located outside the area of roads and parking.  Earth fill  shall be carefully tamped around each valve box to a distance of 4 feet on all sides of the  box, or to the undisturbed trench face if less than 4 feet.

C.   There shall be a valve at all branches tees and crosses except fire hydrants and fire lines.  Valve shall have the top of the operating nut located at maximum of 12″ below the finished grade.

D.   Valve boxes shall have a 12″x12″x8″ reinforced concrete slab surrounding it, on paved  areas at  grade, and in swale areas 4″ below grade for placement of sod over the slab.