PHYSICAL FACILITIES Consultant s Handbook Division 33 Utilities 1300 Disinfecting Underground Potable Water Piping.
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1 1 General 11 This section describes the procedure to ensure the delivery of potable water as approved by Indiana Department of Environmental Management 12 All repaired or newly constructed potable water lines must be properly disinfected by one of the methods described below and be approved by the owner s representative before resuming service The appropriate method shall be applied to all pipe on either side of any new piping or fittings and continuing to the nearest mechanical valves that can stop water flow so as to isolate the piping 13 For the purpose of the procedure outlined below, Authorized University Employees are a Water Works Operator appropriately trained and employed by Purdue University 14 For this section of the guidelines underground pipe includes all piping prior to, that is on the system side of, the building backflow prevention system or, if no backflow prevention equipment exists, the main shut-off valve on the interior of the building 1 Each disinfection process will be recorded on a Potable Water Line Disinfection Monitoring form Copies of this form will be forwarded to the Utilities Department and the original will be filed in the Water Works Office 16 Operation of the potable water distribution system (the opening and closing of valves) shall be by a University Water Works Employee 2 Air Testing 21 Under no conditions will air pressure be allowed as a testing medium for any water piping system 3 Applicable Codes IDEM 327 IAC Rule ANSI / AWWA B300 Hypochlorites ANSI / AWWA C61 Disinfecting Water Mains ANSI / AWWA C600 Installation Of Ductile Water Mains And Their Appurtenances ANSI / AWWA C60 Underground Installation Of PVC Pressure Pipe And Fittings For Water Indiana State Plumbing Code (latest edition adopted by the State) 4 Disinfectant Monitoring Methods 41 The disinfectant level will be monitored by at least one of the following methods: Dipstick Method Colormetric Method Potable Water for Flushing 1 Water for testing shall be arranged for by the Contractor with the Owner s Representative 2 Potable water for flushing, chlorinating, pressure testing, etc must be supplied through a horizontally mounted reduced pressure type backflow preventer, so as to protect the potable water system from the cross connection 3 The Contractor shall furnish all necessary equipment, piping, pumps, fittings gauges, etc and personnel to properly conduct the testing 6 Chlorination 61 Hypochlorites shall be certified by NSF/ANSI 60 per AWWA B300 Section Sodium Hypochlorite: The disinfectant used for sanitizing plumbing parts and materials that directly contact potable water will be NFS/ANSI 60 approved bleach which has a chlorine concentration of 2% 63 Calcium Hypochlorite: Chlorination granules that are specifically for municipal water treatment containing approximately 6% chlorine by weight and are readily soluble in water Note: Do NOT use chlorine tablets or granules intended for swimming pool disinfection, as this material is extremely difficult to eliminate from the pipe after the desired contact time 64 The Contractor shall supply all valves, backflow preventers, chlorine, sodium sulfite, gauges, and all other equipment required to complete this procedure 7 Draining Of Working Area 71 The Contractor shall provide and operate pumps or other equipment necessary to drain and keep excavations, pits, trenches, etc, free of water Page 1 of
2 72 The Contractor shall be responsible for the proper treatment and discharge of all testing, drainage and other water from the construction and repair site or as the result of construction and repairs This treatment and discharge shall be in accordance with federal, state, and local regulations and ordinances 8 Procedure for new sections of underground pipe 81 Disinfect The New Piping And Fittings 811 Chlorine dosing, water addition and testing must be witnessed and approved by an Authorized University Employee 812 The slug method is typically the preferred method at Purdue University Refer to AWWA Standard C61, Section 44: Methods of Chlorination 813 Calcium hypochlorite granules are placed in the piping as it is installed, the piping is completely filled with water to eliminate air pockets and the piping is flushed to remove particulates 814 Chlorinating the Piping: Refer to the Purdue University Water Works Table of Chlorinating Dosages in this Guideline The target level is 200 ppm free residual chlorine when the water temperature is above 48 F but at no time may the free residual chlorine level exceed 400 ppm The main must be disinfected at zero pressure (0 psi) by gauge for three hours 82 Flush the Non-Potable Water from the Pipe and Fittings 821 This procedure must be witnessed Employee or Designated Representative 822 Flushing must be through an unrestricted outlet so that the pressure is never above 20 psi applied to any portions of the water system not under repair 823 Flowing water velocities, from the flushing, must be greater than one foot per second (1 FPS) and less than two and a half feet per second (2 FPS) 824 Flush six (6) minutes for every 100 feet of pipe from the farthest block valve to the repair point 82 This step must be done in conjunction with Section 84 below 83 Neutralize the Chlorine Remaining in the Disinfecting Water 831 This procedure must be witnessed Employee Refer to AWWA Standard C61 Section 42 Disposing of Heavily Chlorinated Water As the disinfecting solution is flushed from the main it must react with granular technical grade sodium sulfite (Na2SO3) 84 Test for the Absence of Disease Indicator Bacteria; Total Coliforms: 841 This procedure shall be performed by an Authorized University Employee 842 Refer to AWWA Standard Methods for the Examination of Water and Wastewater 843 During the testing period, the work area shall be safe and protected from unauthorized access 844 Free residual chlorine concentration shall be measured and reported for all samples Two samples shall be taken; one of the potable water used for flushing just prior to the backflow preventer, and the second of the water from the repaired main and fittings Another set of two samples at the same locations shall be taken 24 hours later 84 No further work on the new pipe and fittings will be permitted until two sequential indicator bacteria tests (Total Coliform, Fecal Coliform) results are reported as ABSENT Indicator bacteria testing shall be expected to take seven (7) days 846 Written record, signed by the appropriate Purdue employee, of the indicator bacteria testing results shall be supplied to the Water Works Manager 847 In the event two sequential indicator bacteria tests are not reported as ABSENT, repeat previous sections of this guideline until such results are obtained 8 Flush The New Piping And Fittings To Remove All Loose Materials 81 This procedure must be witnessed Employee or Designated Representative 82 See AWWA Standard C61 Figures 1 & 2 and Table 3 83 Flushing must be through an unrestricted outlet so that minimum pressure is applied to any portions of the water system not Page 2 of
3 under repair Flowing water velocities, from the flushing, must be greater than two and a half feet per second (2 FPS) and less than ten feet per second (10 FPS) 84 Flush two (2) minutes for every 100 feet of pipe from the farthest block valve to the repair point 8 At no time shall pressure be above 20 psi 86 Flushing shall be to the nearest Authorized University Employee approved storm water drain 9 Procedure for repaired sections of underground pipe 91 General 911 Disinfections will take place by using a chlorine concentration of 200 ppm with a contact time of three hours 912 Refer to the Purdue pipe diameter to length chlorination dosage chart for the correct combination of bleach measured in ounces or Gallons The chart also includes a reference for mixing 200 ppm chlorine solutions for submerging and surface disinfecting 92 Reinstating Drained Systems, Major Repair or Renovation, and Cross Connection Repair: 921 Flood the affected water system with the 200 ppm chlorine solution 922 Calculate the chlorine concentration by using the attached chart and protect the existing distribution system from potential back flow Make sure the disinfectant is distributed throughout the system by checking for bleach odor at the outlets 923 Valve off and allow to stand at zero pressure for three hours 924 Submerge smaller plumbing materials which come in contact with potable water into a container with 200 ppm chlorine solution with a contact time of three hours Any accumulation of dirt or contamination should be removed prior to submerging These containers should be used for no other purpose 92 The existing plumbing fixtures to which the sanitized hardware is to be attached should be thoroughly sprayed, swabbed, or soaked with a 200 ppm chlorine solution prior to connection 926 Contact the Authorized University Employee so that the disinfectant level can be monitored 927 Flush the system 928 A bacterial water sample will be taken at the discretion of the Authorized University Employee 93 Taps 931 Before the process of cutting and making a tap into the potable water system is initiated all surface dirt and contamination should be removed A liberal application of a 200 ppm chlorine solution must then be applied to the tap site and to the cutting equipment 94 Repair Clamps 941 If the water line remains live, and the pressure in the line remains above 20 psig at all times during the repair, then disinfection with chlorine will not be required If the pressure drops below 20 psig at any time then the disinfection process will be followed 9 Temporary Feeds or Bypass Lines 91 The type of plumbing materials being used for the construction of a bypass will determine the disinfection process Smaller plumbing materials can be submerged while hoses should be flooded Use the 200 ppm chlorine solution with a contact time of 3 hours for both procedures Apply liberal amounts of a 200 ppm chlorine solution to the existing plumbing connection points Temporary lines must be equipped with a back flow device so that the main water distribution system is protected 10 Disinfection and flushing tables 101 Measuring Reference Measurement Ounces Half Teaspoon 008 Teaspoon 016 Tablespoon 0 Cup 80 Pint 16 Quart 32 Gallon 128 Page 3 of
4 ppm Concentration Reference Bleach Water 0 Oz 1 Gallon 0 Oz 10 Gallons 103 Sodium Sulfate required neutralizing 200 ppm chlorine per 100 lin ft of pipe Pipe Size Pounds Page 4 of
5 104 Chlorinating with 0% bleach dosages Pipe Dia Lin Feet (in) Oz 0144 Oz 0288 Oz 0432 Oz 08 Oz 17 Oz 744 Oz Oz 076 Oz 112 Oz 1728 Oz 2304 Oz 6896 Oz 1436 Pint Oz 1296 Oz 292 Oz 3872 Oz 168 Oz 12 Oz 1616 Qt Oz 2304 Oz 492 Oz 6896 Oz 92 Oz 1724 Pint 2873 Qt Oz 384 Oz 7184 Oz 1077 Oz 1437 Oz 1347 Qt 1122 Gal Oz 168 Oz 1034 Oz 12 Oz 1293 Pint 1939 Qt 1616 Gal Oz 912 Oz 1149 Pint 1724 Pint 1149 Qt 3447 Qt 2873 Gal Oz 1293 Pint 1293 Qt 1939 Qt 286 Qt 1939 Gal 6464 Gal Oz 1149 Qtr 2298 Qtr 3447 Qtr 1149 Gal 3447 Gal Pint 1796 Qt 391 Qt 1347 Gal 1796 Gal 387 Gal Qt 286 Qt 1293 Gal 1939 Gal 286 Gal 777 Gal Qt 319 Qt 176 Gal 2639 Gal 319 Gal 108 Gal Qtr 1149 Gal 2298 Gal 3447 Gal 496 Gal Gal Gal Gal Gal Gal Gal Qtr 1796 Gal 391 Gal 387 Gal 7182 Gal 2146 Gal 7182 Gal Chlorine dosage of 200 ppm may be used for dosage times of 3 hours when water temperature > 48 F Page of
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