Test Calibration. Make monthly calibrations to check the accuracy of
feed-rate and control mechanisms. Indicate or record feed rates and amounts. The
test procedures in Table 45 apply to various feeders.
Solution Feeders. Maintenance procedures for solution feeders are
summarized in Table 46.
Tanks and Reservoirs. Water storage facilities are maintained according
to the procedures listed in Table 47. The following paragraphs cover the activities
involved in painting tanks: surface preparation, paint application methods, and paint
selection. Additional information on tank inspection, painting, and maintenance can be
found in pars. 2.1.4 and 2.2.41.
Paint Systems for Steel Storage Tanks
Surface Preparation. Good surface preparation is required to ensure
adequate bonding of the paint to the metal to be protected. See par. 18.104.22.168.
If the original surface preparation was poor and the mill scale was
not removed when the tank was originally painted, blast cleaning is required before
repainting. If the original surface preparation was adequate, but the old paint has
completely broken down, blast cleaning of areas with loose or failing paint is usually
warranted. If the old paint is still in good condition, only those areas with loose paint
need to be removed by wire brushing or sanding.
All areas that have been cleaned of loose paint down to the bare
metal need to be primed before rust has a chance to form. Follow Steel Structures
Painting Council specifications.