Waterblog

The American Water Works Association (AWWA) D102 Standard – Coating Steel Water Storage Tanks – requires that all “… coatings used on wet interior surfaces of the tank, shall have been tested and certified for potable water contact in accordance with NSF/ANSI 61. They shall have been evaluated for long-term fresh water resistance and the system [...]

The American Water Works Association publishes the D102-06 standard “Coating Steel Water Storage Tanks“.  Specifiers use it to dictate the kind of paint coating system they want applied to their water tank. Within the D102-06 standard, there are currently 6 coating systems for exterior surfaces (Outside Coating Systems – OCS) and 5 coating systems for [...]

The current procedure for inspecting the coating for holidays in water storage tanks is to follow NACE SP 0188-06 Discontinuity (Holiday) Testing of New Protective Coatings on Conductive Substrates. This method involves passing an electric low voltage wet sponge or high voltage spark tester over the coating area that will be in immersion. This procedure [...]

Webster’s defines a specification as, “A particular and detailed description of a thing: specifically a statement of particulars describing the dimensions, details, or peculiarities of any work about to be undertaken as in architecture, building, engineering, etc.” Today’s high performance coatings are more sophisticated than ever and require unique application techniques or equipment.  Labor rates [...]

As far back as 1965, in the Glossary of Terms Used in Maintenance Painting, the National Association of Corrosion Engineers (today, NACE International)  defined recoat window as the “time interval required between successive coats.” This “time interval / recoat window” allows the solvents in a primer to evaporate and the protective film to begin to form [...]