NR 811.48(8)(a)(a) Gaseous ammonia. Housing and ventilation for ammoniation shall meet the requirements under subs. (5) and (6) for chlorine, except that the exhaust fan inlet shall be within 12 inches of the ceiling and the fresh air inlet shall be within 12 inches of the floor. Ammonia storage and feed facilities shall be separate from chlorine facilities because of the combustion hazard. A plastic bottle of hydrochloric acid shall be available and used for leak detection.

NR 811.48(8)(c)1.1. An aqua ammonia chemical feed and storage system shall be installed in its own dedicated room.

NR 811.48(8)(c)2.2. Bulk liquid storage tanks and day tanks shall be vented to the outside of the building and discharge downward facing with a 24-mesh corrosion resistant screen a minimum of 24 inches above grade. The chemical tank vents shall be provided with inert liquid traps.

NR 811.48(8)(c)3.3. An incompatible connector or lockout provisions shall be provided to prevent accidental addition of other chemical to the bulk liquid storage tanks.

NR 811.48(8)(c)4.4. The bulk liquid storage tanks shall be designed to avoid temperature increases that cause the ammonia vapor pressure over the aqua ammonia to exceed atmospheric pressure. The provisions shall include a means of external cooling or dilution and mixing of the contents with water without opening the bulk liquid storage tank.

NR 811.48(8)(c)5.5. An exhaust fan shall be installed to withdraw air from high points in the room and makeup air shall be allowed to enter at a low point.

NR 811.48(8)(c)6.6. The aqua ammonia feed pump, regulators, and lines shall be fitted with pressure relief vents discharging outside the building away from any air intake and with water purge lines leading back to the headspace of the bulk storage tanks.

NR 811.48(8)(c)7.7. The aqua ammonia shall be conveyed directly from a day tank to the treated water stream injector without the use of a carrier water stream unless the carrier stream is softened.

NR 811.48(9)(a)(a) Calcium hypochlorite solution formation. The calcium hypochlorite solution shall be produced by dissolving tablets with a department approved feed water source using an erosion chamber or an upward directed spray system. The department may approve other methods or technology for producing calcium hypochlorite solution after the submittal of data from a department-approved pilot program.

NR 811.48(9)(b)(b) Tablets. The calcium hypochlorite tablets used in the chlorinator shall be supplied by the manufacturer of the tablet chlorinator equipment. The supplier of the calcium hypochlorite tablets shall have obtained NSF/ANSI Standard 60 certification for the tablets in accordance with s. NR 810.09.

NR 811.48(9)(c)1.1. The tablet hopper shall be sized to provide a minimum of 2 days of supply assuming average day consumption of the tablets.

NR 811.48(9)(c)2.2. Load cells shall be provided on the hopper so that the weight of the tablets consumed in a 24-hour period can be determined. The design shall allow for collection of the data necessary to determine the theoretical daily chlorine usage. The design shall allow any solution to be drained out of the hopper before weighing the tablets. The load cell equipment shall be capable of providing an alarm when the weight of the tablets approaches a one day supply based upon an average day use. The alarm signal shall be automatically annunciated by the water system controls. A local alarm shall be sounded or signaled by an exterior red light at the pump station if the operation of the pump station is not remotely controlled.

NR 811.48(9)(c)3.3. The tablet hopper shall include a screened air-vacuum relief device if the possibility of a vacuum condition could develop during the operation of the tablet chlorinator.

NR 811.48(9)(d)1.1. The open area for any pipe penetration through the walls of the solution tank shall be sealed sanitarily so that insects and foreign material cannot contaminate the chlorine solution.

NR 811.48(9)(d)2.2. The on and off operation of the process to produce chlorine solution from the tablets shall be controlled by float switches or sensors located in the solution tank.

NR 811.48(9)(d)3.3. Float switches or sensors shall be installed and wired to provide automatic shut-off and operator alarms for low and high solution level conditions. The shut-off and alarm signals shall be automatically annunciated by the water system controls. A local alarm shall be sounded or signaled by an exterior red light at the pump station if the operation of the pump station is not remotely controlled.

NR 811.48(9)(d)4.4. The tank shall be capable of being drained for maintenance purposes.

NR 811.48(9)(d)5.5. The solution tank shall be sized to keep an adequate supply of calcium hypochlorite in the tank at all times based upon the capabilities of the tablet chlorinator to produce solution and the chemical feed pump withdrawal rates necessary to achieve the required dosages.

NR 811.48(9)(e)1.1. The flow rate and pressure of the feed water piping shall be regulated so as to meet the design flow requirements provided by the supplier of the equipment. A shut-off valve, flow meter, and pressure gauge shall be installed on the feed water piping.

NR 811.48(9)(e)2.2. Pre-treatment devices shall be installed as necessary if the feed water does not meet the water quality requirements designated for the tablet chlorinator. Any pre-treatment device shall be compatible for use in a potable water system and shall not be used unless approved by the department. A strainer-filter shall be installed on the feed water piping, if necessary.

NR 811.48(9)(e)3.3. A check valve shall be installed on the feed water piping upstream of any treatment equipment, control valve, or solenoid valve.

NR 811.48(9)(e)4.4. A solenoid valve shall be installed on the feed water piping to control the flow of water into the tablet chlorinator. The operation of the solenoid valve shall be controlled based upon float switches or sensors located in the solution tank.