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j l I I ] J } ~J. ....... .~' J J J J .J J J J J 1 In using arc weiding machines, the current control should be set at minimum before starting. After starting the machine. advance the control until the current indicated on the ammeter is ~t the desired test value. . CAUTION: lit case of open circuits at joints or coMections, the voltage across the defective joint or coMection wjll be in the order of 80-1 00 volts. 304.3 DISINFECTION All water distribution system or extension to existing system, or any valved section of such extension, lor replacement, shall be disinfected prior to placing same ~n service. . Such chlorination shall consist of a dosage of chlorine equivalent to 50 parts per million of chlorine. This may be accomplished by using a commercial type chlorinator for feeding a chlorine solution or by placing dry Calcium Hypochlorine such as "HTH", "PERCHLORON", or "MAXOCHLOR" at the rate of one pound (1#) of material containing 70%. available chlorine per each 1680 gallons of water in the line. A predetennined dose shall be shaken into the suction wall. the standpipe or elevated tank. or into the pipe at the first joint attached to the existing water pipe, and the dosage r shall be repeated at frequent predetennined intervals. preferably at each pipe joint as the pipe laying progresses. or as may be directed by the ENGINEER. When treated with dry calcium hypochlorite or with dry chlorinated lime. the newly laid pipe shall be filled very slowly to avoid washing the powder to the extremity of the pipe line. Treated water shall be retained in the pipe long enough to destroy all non-spore-:-fonning bacteria. This period shall be at least three hours and preferably longer. as may be directed. After chlorine treated water has been retained for the required time, the chlorine residual at pipe extremities and at other representative points shall be at least five parts per Dillion. In the process df chlorinating newly laid water pipe, all valves or other appurtenances shall be operated while the pipe line is filled with the chlorinating agent. I Following chloiination, all treated water shall be thoroughly flushed from the newly laid pipe at its extremities until the replacement water throughout its length, shall, upon test. both chemically and bacteriologically, be proven equal to the water quality served the public from the existing water supply system, and approved by the State Board or Department of Health. In the event the test in the opinion of the ENGINEER proves unsatisfactory, chlorination shall be repeated until a satlsfa~ory condition of the water within the pipe is established. Unless the ENGINEER shall direct otherwise, cuts made in existing pipe lines for the insertion of valves, fittings, repairs, or for any oth~r purpose shall be chlorinated by shaking a quantity of the powder, predetennined by the ENGINEER, into the pipe on 300-17