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Protective coatings are utilized for asset preservation on welded steel potable water tanks. The technology available to the Owner or Specifier is diverse and can be difficult to select the most sustainable solution. Data based service life assessment of the various coating options provides the best avenue for completing life cycle costing estimates for decision making.
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This paper focuses on the risk of corrosion of austenitic stainless steels following exposure to oxygenated chloride containing waters, such as during hydrotesting or commissioning activities.
Hydrotesting is an activity typically occurring during construction intended to confirm the component's structural integrity for the design and operating pressure. The commissioning phase can use the same water in multiple systems for dynamic commissioning.
In 2010 the Tucson Water Department began to implement the Tucson Water Reservoir and Tank Program. The purpose of the program was to evaluate and repair approximately 70 concrete and steel potable water storage facilities.
This standard presents the practices used in providing galvanic anode cathodic protection (CP) to the normally submerged steel surfaces inside steel water storage tanks. It provides owners, engineers, and contractors a standard practice for the application of CP to the submerged surfaces of steel water storage tanks; for determining the effectiveness of these CP systems; and for the operation and maintenance of these CP systems.
This standard is applicable to steel water storage tanks of various sizes used in municipal water supply and fire protection, including elevated tanks and flat-bottom tanks at ground level. Although the practices presented in this standard generally are applicable to all such tanks, the galvanic anode CP system described in this standard may not be practical for tanks with large CP current demands.
In 1984 the US EPA issued a Request for Proposals to select a provider to privatize the approval of products and components used in water distribution systems across the United States. A team which was led by NSF International and included the American Water Works Association Research Foundation, the Association of State Drinking Water Administrators, the Conference of State Health and Environmental Managers, and the American Water Works Association was awarded the contract to develop the standard. In 1988, NSF/ANSI 61: Drinking Water System Components ― Health Effects was published as a result of the work of this team. This standard established minimum requirements for the control of potential adverse human health effects from products that contact drinking water and has been updated regularly since then to add testing criteria for additional contaminants and product types.