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2009 Wildwood Water Utility Specifications

Updated 06/29/09

3.5PRESSURE AND LEAKAGE TESTS

A.  Procedure and Duration  

Each section of pipe line shall be slowly filled with water and the specified test pressure, measured at the point of lowest elevation, shall be applied by means of a pump connected to the pipe in a manner as satisfactory to the Engineer. The pump, pipe connection gauges and all necessary apparatus shall be furnished by the contractor. The contractor shall furnish all necessary assistance for conducting the tests. The duration of the test shall be two (2) hours unless otherwise directed by the Engineer. All air must be expelled from the high points in the pipe line prior to the test period.

B.  Pressure During Test

The pipe shall be subjected to a hydrostatic pressure one hundred (100%) percent above normal operating pressure, but not exceeding the rated working pressure of the pipe. The normal operating pressure shall be defined by the Engineer. During the test all exposed pipe, fittings, valves, hydrants, and joints will be carefully examined. If the pipe is found to be defective, they shall be removed and replaced by the contractor with sound material. The test shall then be repeated until satisfactory to the Engineer.

C.  Leakage Test

The pressure during the leakage test shall be at normal operating pressure. The duration of the test shall be two (2) hours unless otherwise directed by the Engineer. The test shall be conducted in the same manner as the pressure test except that the contractor shall provide suitable equipment for measuring the amount of leakage. No pipe installation will be accepted until or unless the leakage for the section of line tested is less than the rate of leakage specified in the following table. (TABLE A)  In calculating leakage, the Engineer will make allowances for added joints in the pipe line above those incidentals to normal lengths of pipe.

D. Above results must be reported to the WWU as soon as the testing is completed.

TABLE A

LEAKAGE  IN  U.S. GALLONS  PER   24  HOURS  PER  MILE  PER  INCH DIAMETER  PIPE AT  PRESSURE  STIPULATED

PRESSURE    PSIU.S.  GALLONS

15064.5

12559.0

10052.0

7545.5

5037.5

Should any test of a section of the pipe line disclose leakage greater than permitted, the contractor shall locate and repair the defective joints and or pipe until the leakage is within the permitted allowance.

3.6BACKFLOW PREVENTION DEVICE INSTALLATION

The following backflow prevention devices shall be installed between the meter assembly and the building: (SEE FIGURE 1)

1. For dwelling units - a single check valve assembly;

2. For places with a minor hazard - offices, stores, shops,

3. For places with an intermediate hazard - diners, restaurants, motels, gasoline stations, auto repair shops, etc. - a reduced pressure backflow preventor is required.

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