Section 62-04-08-03 - Softener construction1. Materials shall be selected for their strength and resistance to corrosion by water and brine; shall be free of objectionable color throw, taste and odor; and shall not impart toxic substances to the water. 2. Softener tanks shall be constructed for a minimum working pressure of one hundred twenty-five pounds per square inch [56.70 kilograms per 6.45 square centimeters] and a hydrostatic test pressure of two hundred pounds per square inch [90.72 kilograms per 6.45 square centimeters]. a. Tanks shall be suitably corrosion resistant as to types of material or protective mechanism. Types of materials would include corrosion resistant, or noncorrosive materials such as high nickel alloys, 18-8 stainless steel and plastics. Plastic tanks shall meet the requirements of the national sanitation foundation. b. Mild steels are not to be used unless the interior of the tank is protected by a lining or coating such as hot dip galvanizing; organic coating; glass, ceramic or rubber lining. Galvanized tanks shall contain not less than one and five tenths ounces [42.53 grams] of zinc per square foot [929.03 square centimeters]. If the internal coating or protective mechanism is not suitable for protecting the exterior of the tank, a suitable external protective means, such as hot dip galvanizing, porcelain enamel, or organic finish shall be used. 3. Valves, piping, and screens. a. Valves, piping, and screens shall be constructed of suitable corrosion resistant materials. Dissimilar metals shall be insulated or shielded when deemed necessary by the manufacturer. b. Automatic water softeners employing electrical or hydraulic operating controls shall be of sturdy construction with durable combination valves and time clocks. They shall be constructed to minimize the possibility of admitting salt water into the house water system when the manufacturer's instructions are followed. All electrical components shall be "approved" as defined in the current National Electric Code (published by national board of fire underwriters). c. The ion exchanger shall be of a suitable type, insoluble in water, of good durability, free from objectionable color-throw, taste, odor, and should not impart toxic substances to the water. General Authority: NDCC 43-18.1-03
Law Implemented: NDCC 43-18.1-04
N.D. Admin Code 62-04-08-03