From the initial standards covering pipes, water meters and steel water storage tanks, AWWA volunteers have guided the expansion of the standards program. The Council has grown from five to 24 members, with nearly 1, volunteer subject matter experts serving on 72 Committees. Latest Standards C Stainless-Steel Fittings for Waterworks Service This standard describes stainless-steel, ring-type, slip-on flanges and blind flanges for use in conjunction with stainless-steel pipe used in facilities of waterworks service. Flanges covered in this standard are intended for use with stainless-steel pipe Buy Now D Factory-Coated Bolted Carbon Steel Tanks for Water Storage The purpose of this standard is to provide minimum requirements for the design, construction, inspection, and testing of new cylindrical, factory-coated, bolted carbon steel tanks for the storage of water. This standard is
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Mibar The chlorinated water shall remain in the pipe for at least 24 hr. It shall be delivered to the job in closed containers and shall be kept clean and applied with dedicated clean applicators. This hose must be removed during the hydrostatic pressure test.
Figure 1 applies to pipes with diameters 4 in. The pipe required for the connection must be set up aboveground, disinfected, and bacteriological samples taken, as described in Section 5, if 6c total length of the connection from the end of a new main to the existing main is greater than 20 ft 6 m. The material should be stored in a cool, dry, and dark environment to minimize its awaw.
The more closely the rate of delivery is correlated to the rate of pipe laying, the lower the risk of contamination. The purpose of all four chlorination methods is to disinfect water lines, resulting in an absence of coliforms as confirmed by laboratory analysis. Tablets dissolve in approximately 7 hr and must be given adequate contact time. Caution should be used with highly chlorinated water when conducting hydrostatic pressure testing and with highvolume flushing of water.
Dechlorination equipment may not be capable of handling high flows with high levels of chlorine. Any organic compound containing chlorine as a constituent. Generally, it is easier to disinfect a new main than one that has had emergency repairs in terms of access, sanitary control, and the time available for disinfection, sampling, and testing.
A Purchaser Options and Alternatives In some cases, situations become catastrophic where there is a pipe blowout and a loss of water pressure prior to shutdown, requiring disinfection procedures equivalent to those of a new main installation. The tablet method is convenient to use in mains having diameters up to 24 in. Determine the status of certifications by parties offering to certify products for contact with, adwa treatment of, drinking water. OSHA requirements for confined space need to be addressed before entering a pipeline.
Flushing locations, rates of flushing, and locations of drainage facilities Sec. Option A samples are 16 hr apart, and Option B samples are 15 min apart after a hr rest period foreword II. If chemical contamination occurs, such as a hydraulic oil leak or petroleum product spill, the xwwa sections exposed to the contamination should be replaced and not reused for potable water applications.
After following the appropriate methods above, prior to returning the pipe to service, the efficacy of the disinfection procedure shall be verified by testing for the absence of coliform bacteria. The tablet method cannot be used unless the main can be kept clean and dry.
Record the total number of drops used and the final chlorine reading obtained that is, the chlorine reading of the c standard. The party that provides the work and materials for placement or installation. After samples have been collected, the gooseneck assembly may be removed and retained for future use and the corporation cock should be capped or taped for future reuse.
Where necessary, c, state, local, or provincial regulatory agencies should be c to determine special provisions for the disposal of heavily chlorinated water. PDF and Related Books. AWWA C Disinfecting Water Mains Where such flow rates are not possible, flushing at the maximum expected flow rate for the line for 2—3 volumes may be acceptable.
The amount of chlorine combined with ammonia NH3 or other compounds in water. Major revisions made to the standard in this edition include the following: Materials such as jute or hemp shall not be used. Revisions were approved on Sept. This method reduces the volume of heavily chlorinated water to be flushed to waste. Until each optional feature is specified by the user, the product or service is not fully defined. Potable water shall be used for disinfection, hydrostatic pressure testing, and flushing.
As an optional procedure, if required by the purchaser, water used to fill the new main shall be supplied through a temporary connection that shall include an appropriate cross-connection control device, consistent with the degree of hazard, for backflow protection of the active distribution system see Figure 1. Concentration of chlorine species present in water after the oxidant demand has been satisfied. Also, any connection of a new water main to the active distribution system before the receipt of satisfactory bacteriological samples may constitute a cross-connection.
After satisfactory bacteriological sample results have been received for the predisinfected pipe, the pipe can be used in connecting the new main to the active distribution system. The quantity of granules at each location shall be as shown in Table 1. Chlorine dosage reference tables are provided as appendix B of this standard.
The disinfection procedure selected should be determined by the conditions and severity of the main break. It is not a specification. If water accumulates in the trench, the plugs shall remain in place until the trench is free of standing water and mud that may enter the pipe. C figure applies to pipes up to and including 8-in. Specific situations not captured below need to be evaluated and the appropriate disinfection and sampling methods followed.
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Mibar The chlorinated water shall remain in the pipe for at least 24 hr. It shall be delivered to the job in closed containers and shall be kept clean and applied with dedicated clean applicators. This hose must be removed during the hydrostatic pressure test. Figure 1 applies to pipes with diameters 4 in. The pipe required for the connection must be set up aboveground, disinfected, and bacteriological samples taken, as described in Section 5, if 6c total length of the connection from the end of a new main to the existing main is greater than 20 ft 6 m. The material should be stored in a cool, dry, and dark environment to minimize its awaw.
Download: Standard AWWA C652-11.pdf
Download: AWWA C651.pdf
AWWA C651 STANDARD PDF