The National Sanitation Foundation (NSF) has recently revised the NSF/ANSI/CAN Std. 61 "Drinking Water System Components –Health Effects Standard" resulting in the creation of a new standard, NSF/ANSI/CAN Std. 600 "Health Effects Evaluation and Criteria for Chemicals in Drinking Water". This results in changes in potable water asset owners’ options for protective coating systems. As well, in June 2021 AWWA published a new revision of the AWWA D102-21 Coating Steel Water-Storage Tanks. Many owners fail to realize a protective coatings system is itself an asset, and asset management principles should be applied to the selection of a protective coating system.
This paper will review the changes in the NSF Std 61 and the implications for the coating systems. The coating systems for steel potable water storage tanks listed in the new AWWA D102-21 will be reviewed. The presentation will explain how asset management's goals centred on life cycle costing will yield the longest service life, lowest life cycle cost and the most sustainable solution. An asset management-based data driven protocol is presented using a recent survey of case histories in North America, ASTM test data with a review of published papers offering service life estimates. Suggestions will be offered on procurement practices and specifications to ensure purchasing goals are aligned with sustainable solutions.
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.
Regulations on the design limitations of various coatings is a constantly changing aspect that must be researched and understood to ensure proper compliance.
Both of these aspects are discussed in this paper along with their logistic impacts.
