Paint Application Methods
Paint may be applied by a number of methods:
Special methods for applying heavy coatings.
The method best suited for application depends on the type of
paint, degree of complexity of the surface being painted, paint viscosity, and other
considerations, such as the amount of spray carryover with spray-painting techniques.
The paint manufacturer and a professional painting contractor can advise installation
personnel of the best application method for the tank being painted. Apply paint
according to the instructions in par. 220.127.116.11.
Select protective coatings in accordance with par. 18.104.22.168. It is
normally recommended that only paints meeting ANSI/NSF Standard 61 be used on
surfaces in contact with potable water. Environmental conditions affecting the exterior
of the tank and water characteristics within the tank result in varying painting system
requirements. A reputable paint manufacturer can provide valuable guidance in paint
selection, based on laboratory testing results and experience with painting systems on
Paint testing may be required on tanks for which a particular paint
system has proven unsatisfactory. Various painting systems can be used on different
areas of the tank to determine which system performs the best.
The thickness of the dried paint film should be specified and
measured after the painting has been completed. Various paints require varying dry-
film thickness for optimum life.
In general, it is best to use paints that require similar surface
preparation procedures for both the interior and exterior of the tank, since these
procedures are usually conducted in a single operation.