MIL-HDBK-1138
Table 13
Surface Preparation Standards
Designation
Title
Typical Uses
SSPC SP1
Solvent Cleaning
For all surfaces
SSPC SP2
Hand Tool Cleaning
Where abrasive blasting
not permitted
SSPC SP3
Power Tool Cleaning
Where abrasive blasting
not permitted
SSPC
SP5
White Metal Blast Cleaning
For immersion service
SSPC
SP6
Commercial Blast Cleaning
Noncritical areas
SSPC
SP7
Brush-Off Blast Cleaning
New concrete
SSPC
SP8
Pickling
For hot dip galvanized
SSPC
SP10
Near-White Blast Cleaning
Non-immersion, but
critical service
SSPC SP11
Power Tool to Bare Metal
Special, non-immersion
SSPC SP12
High- and Ultrahigh-
General clean-up;
Pressure Water Jetting
existing concrete
8.2.1.2
Coating Systems for Metals. Maintenance of
coating systems in WWTPs depends upon a number of factors: 1)
knowing the specific coating systems that currently exist within
the plant; 2) implementing an active inspection program; and
3) providing a good maintenance painting program. Maintenance
painting operations are different than new construction painting
operations. With a proper maintenance painting program, total
recoating is generally unusual rather than normal.
Inspection of all coating surfaces should be performed
routinely. Be observant for the first signs of coating
breakdown, such as rust staining and streaking, blistering of
coating, peeling of coating, and other signs of deterioration.
Coatings on steel substrates will generally show the first signs
of failure at sharp edges, such as edges of structural steel,
adjacent to welds, and around threads of bolts and edges of nuts.
Failures on flat surfaces take much longer to develop. In
immersion service, coating failures also develop first at edges
but can also develop on flat surfaces because of imperfections
and defects. Linings in tanks and vessels are especially
critical.
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