(A) Sewers. Testing and inspecting of sanitary sewers for acceptability shall be conducted by:
(1) Air pressure test;
(2) Deflection for flexible thermoplastic pipe; and
(3) Television (providing video tape to village upon completion), inspection in accordance with the Standard Specifications for Water and Sewer Main Construction in Illinois.
(B) Water.
(1) Hydrostatic test. After the pipe has been laid and partly backfilled as specified below, all newly laid pipe or any valved sections of it shall, unless otherwise expressly specified, be subjected to a hydrostatic pressure of 100 pounds per square inch. Duration of each pressure test shall be for a period of not less than one hour for pipes with uncovered joints and not less than 24 hours for pipes which have been backfilled before tests are made.
(a) Procedure for test. After all fittings, service connections and service pipe (to the Buffalo box) is installed, each valved section of pipe shall be slowly filled with water and the specified test pressure shall be applied by means of a pump connected to the pipe in a satisfactory manner. The pump pipe connection and all necessary apparatus including gauges and meters shall be furnished by the contractor. Before applying the specified test pressure, all air shall be expelled from the pipe. To accomplish this, taps shall be made, if necessary, at points of highest elevation and afterwards tightly plugged. All exposed pipes, fittings, valves, hydrants and joints shall be carefully examined during the open trench test. All joints showing visible leaks shall be repaired until tight. Any cracked or defective pipes, fittings, valves or hydrants discovered in consequence of this pressure test shall be removed and replaced by the contractor with sound material and the test shall be repeated until satisfactory to the Village Engineer.
(b) Permissible leakage.
1. Suitable means shall be provided by the contractor for determining the quantity of water lost by leakage under the specified test pressure.
2. Allowable leakage shall be not greater than computed by the following table. (Allowable leakage is shown in gal/hr. 1,000 ft.)
Diameter of Pipe | Allowable Leakage | Diameter of Pipe | Allowable Leakage |
Diameter of Pipe | Allowable Leakage | Diameter of Pipe | Allowable Leakage |
2 in. | 0.30 | 18 in. | 2.70 |
3 in. | 0.45 | 20 in. | 3.00 |
4 in. | 0.60 | 24 in. | 3.60 |
6 in. | 0.90 | 30 in. | 4.50 |
8 in. | 1.20 | 36 in. | 5.40 |
10 in. | 1.50 | 42 in. | 6.31 |
12 in. | 1.80 | 48 in. | 7.21 |
14 in. | 2.10 | 54 in. | 8.10 |
16 in. | 2.40 | 60 in. | 9.00 |
3. LEAKAGE
is defined as the quantity of water to be supplied in the newly laid pipe or any valved section of it necessary to maintain the specified leakage test pressure after the pipe has been filled with water and air expelled.
4. Flanged pipe shall be “bottle tight.”
(2) Disinfection of water main.
(a) Flushing. Sections of pipe to be disinfected shall first be flushed to remove any solids or contaminated material that may have become lodged in the pipe. If no hydrant is installed at the end of the main, then a tap should be provided large enough to develop a velocity of at least two and one-half feet per second in the main. One 2-1/2-inch hydrant opening will, under normal pressures, provide this velocity in pipe sizes up to and including 12-inch. All taps required by the contractor for chlorination or flushing purposes or for temporary or permanent release of air shall be provided by him or her as a part of the construction of water mains.
(b) Requirement of chlorine. Before being placed into service, all new mains and repaired portions of or extensions to existing mains shall be chlorinated so that a chlorine residual of not less than ten parts per million remains in the water after standing 24 hours in the pipe.
(c) Form of applied chlorine. Chlorine shall be applied by one of the methods which follow subject to approval by the Village Engineer.
1. Liquid chlorine. A chlorine gas-water mixture shall be applied by means of a solution-feed chlorinating device, or the dry gas may be fed directly through proper devices for regulating the rate of flow and providing effective diffusion of the gas into the water within the pipe being treated. Chlorinating devices for feeding solutions of the chlorine gas, or the gas itself, must provide means for preventing the backflow of water into the chlorine.
2. Chlorine-bearing compounds in water. A mixture of water and high-test calcium hypochlorite (65–70% Cl) may be substituted for the chlorine gas water mixture. The dry powder shall first be mixed as a paste and then thinned to a 1% chlorine solution by adding water to give a total quantity of seven and one-half gallons of water per pound of dry powder. This solution shall be injected in one end of the section of main to be disinfected while filling the main with water in the amounts as shown in the table which follows.
Chlorine Requirements for 100-ft. Lengths of Various Sizes of Pipe | |||
Pipe Size (Inches) | Volume of 100 ft. Length (Gals.) | Amount required to Give 25 ppm Cl. | |
100% Chlorine (Lbs.) | 1% Chlorine- Water Solution (in Gals.) | ||
Chlorine Requirements for 100-ft. Lengths of Various Sizes of Pipe | |||
Pipe Size (Inches) | Volume of 100 ft. Length (Gals.) | Amount required to Give 25 ppm Cl. | |
100% Chlorine (Lbs.) | 1% Chlorine- Water Solution (in Gals.) | ||
4 | 265.3 | 0.0135 | 1/6 |
6 | 146.5 | 0.0305 | 3/8 |
8 | 261.0 | 0.054 | 2/3 |
10 | 408.0 | 0.085 | 1 |
12 | 588.7 | 0.120 | 1-1/2 |
3. Joints. During the construction of said water main, the contractor shall, during the installation, place at each joint, approximately one teaspoonful of H.T.H. 6% chlorine compound or equal.
(d) Point of application. The preferred point of application or the chlorinating agent is at the beginning of the pipe line extension of any valved section of it, and through a corporation stop inserted in the pipe. The water injector for delivering the chlorine-bearing water into the pipe should be supplied from a tap made on the pressure side of the gate valve controlling the flow into the pipe line extension. Alternate points of application may be used when approved or directed by the Village Engineer.
(e) Rate of application. Water from the existing distribution system, or other source of supply as approved by the Village Engineer, shall be controlled to flow very slowly into the newly laid pipe line during application of the chlorine. The rate of chlorine mixture flow shall be in such proportion to the rate of water entering the newly laid pipe that the dosage applied to the water will be at least 25 parts per million unless otherwise directed by the Village Engineer.
(f) Preventing reverse flow. Valves shall be manipulated so that the strong chlorine solution in the line being treated will not flow back into the line supplying the water. Check valves may be used if desired.
(g) Retention period. Treated water shall be retained in the pipe at least 24 hours. After this period, the chlorine residual at pipe extremities and at other representative points shall be at least ten parts per million.
(h) Chlorinating valves and hydrants. In the process of chlorinating newly laid pipe, all valves or other appurtenances shall be operated while the pipe line is filled with chlorinating agent and under normal operating pressure.
(i) Final flushing and testing.
1. Following chlorination, all treated water shall be thoroughly flushed from the newly laid pipe at its extremity until the replacement water throughout its length shows, upon test, the absence of chlorine. In the event chlorine is normally used in the source of supply, then the tests shall show a residual not in excess of that carried in the system.
2. After flushing, water samples collected on two successive days from the treated piping system, as directed by the Village Engineer, shall show satisfactory bacteriological results. Bacteriological analysis must be performed by a laboratory designated and furnished by the owner and approved by the Director of the State Department of Public Health.
(j) Repetition of flushing and testing. Should the initial treatment result in an unsatisfactory bacterial test, the original chlorination procedure shall be repeated by the contractor until satisfactory results are obtained.
(Ord. 1999-2, Subdivisions § 5, subs. .410, passed 2-15-1999)