SECTION 5030 - TESTING AND DISINFECTION
A.�� Pressure and Leak Testing of Water System
B.�� Disinfection of Potable Water Systems
Test and disinfect water mains, valves, fire hydrants, and appurtenances.
Follow the General Provisions (Requirements) and Covenants.
Follow the General Provisions (Requirements) and Covenants.
1.05����� DELIVERY, STORAGE, AND HANDLING
Follow the General Provisions (Requirements) and Covenants.
1.06����� SCHEDULING AND CONFLICTS
Follow the General Provisions (Requirements) and Covenants, as well as the following:
A.�� Notify the Engineer two working days in advance of testing or disinfection operations to coordinate the operations.
B.�� The Engineer or his/her representative is required to be in attendance during testing or disinfection.
1.07����� SPECIAL REQUIREMENTS
None.
1.08����� MEASUREMENT AND PAYMENT
Testing and disinfection of water systems is incidental to the construction of pipe and fittings.
2.01����� DISINFECTION AGENT - CHLORINE
A.�� Liquid Chlorine complying with AWWA B300 and AWWA B301.
B.�� Sodium Hypochlorite complying with AWWA B300.
C.�� Calcium Hypochlorite complying with AWWA B300.
D.�� All disinfecting agents to be NSF 60 certified.� Supply and store in the original container.
3.01����� SEQUENCE OF TESTING AND DISINFECTION
Perform operations according to AWWA C651 in the sequence below.��Successfully complete each operation before continuing to the next operation.� The Jurisdiction will provide reasonable quantities of water for flushing and testing.
A.�� Continuous-Feed or Slug Method (After Water Main Installation):� The sequence of testing and disinfection may be modified with approval of the Engineer.
1.�� Perform initial flush.
2.�� Perform disinfection.
3.�� Flush after disinfection.
4.�� Perform pressure and leak testing.
B.�� Tablet Method (Concurrent with Water Main Installation):� Use this method only if approved by the Engineer.� Modify the procedure for flushing, disinfection, and pressure and leak testing as needed if tablet method is used.
1.�� Perform disinfection.
2.�� Flush after disinfection.
3.�� Perform pressure and leak testing.
1.�� Coordinate flushing with the Jurisdiction.
2.�� Flush pipe prior to disinfection using potable water.
3.�� Measure flushing velocity.
4.�� Obtain a minimum flushing velocity of 2.5 feet per second in the pipe to be disinfected.
B.�� Minimum Flushing Rate:� According to AWWA C651, Table 3, based on 40 psi residual pressure (see table below).
C.�� Property Protection:� Protect public and private property from damage during flushing operations.
1.�� Disinfect according to AWWA C651.� The tablet method contained in AWWA C651 is not to be used unless approved by the Engineer.
2.�� Keep piping to be chlorinated isolated from lines in service and from points of use.
3.�� Coordinate disinfection and testing with the Engineer.
4.�� Obtain and test water samples, unless otherwise provided by the Engineer.
1.�� Induce a flow of potable water through the pipe.
2.�� Introduce highly chlorinated water to the pipe at a point within 5 pipe diameters of the pipe's connection to an existing potable system, or within 5 pipe diameters of a closed end, if there is no connection to an existing system.
3.�� Introduce water containing a minimum of 25 mg/L free chlorine until the entire new pipe contains a minimum of 25 mg/L free chlorine.
4.�� Retain chlorinated water in the pipe for at least 24 hours and no more than 48 hours.
A.�� Flush pipe using potable water until chlorine residual equals that of the existing potable water system.
B.�� Dispose of chlorinated water to prevent damage to the environment.� Dechlorinate highly chlorinated water from testing before releasing into the ground or sewers.� Obtain Jurisdiction approval prior to flushing activities.
1.�� Check with the local sewer department for the conditions of disposal to the sanitary sewer.
2.�� Chlorine residual of water being disposed will be neutralized by treating with one of the chemicals listed in the following table.
3.05����� PRESSURE AND LEAK TESTING
A.�� Remove debris from within the pipe.� Clean and swab out pipe, if required.
B.�� Secure unrestrained pipe ends against uncontrolled movement.
C.�� Isolate new piping from the existing water system.
D.�� Fill and flush all new piping with potable water.� Ensure all trapped air is removed.
E.�� Pressurize the new pipe to the test pressure at the highest point in the isolated system.� Do not pressurize to more than 5 psi over the test pressure at the highest point in the isolated system.
F.�� Test and monitor the completed piping system at 1.5 times the system working pressure or 150 psi, whichever is greater, for 2 continuous hours.
G.�� If at any time during the test the pressure drops to 5 psi below the test pressure, repressurize the pipe by pumping in potable water in sufficient quantity to bring the pressure back to the original test pressure.
H.�� Accurately measure the amount of water required to repressurize the system to the test pressure.
I.��� Maximum allowable leakage rate according to AWWA C600:
L = (S)(D)(P)0.5
148,000
Where:
L = allowable leakage, in gallons per hour
S = length of pipe tested, in feet
D = nominal pipe diameter, in inches
P = average test pressure, in pounds per square inch
The following table assumes an average test pressure (P) of 150 psi and 1,000 feet of test section.
J.�� If the average measured leakage per hour exceeds the maximum allowable leakage rate, repair and retest the water main.
K.�� If the measured pressure loss does not exceed 5 psi, the test will be considered acceptable.
L.�� Repair all visible leaks regardless of the amount of leakage.
Test water mains according to AWWA C651, including collection of two consecutive sets of acceptable bacteria samples 24 hours apart.� If the initial disinfection procedure fails to produce satisfactory bacteriological results or if other water quality is affected, repeat the disinfection procedure.
3.07����� PUTTING WATER MAIN IN SERVICE
Put the completed water system in service only after obtaining permission from the Jurisdiction.
END OF SECTION