Prepared surfaces shall conform to SSPC VIS 1 and SSPC Guide to VIS 1 and
shall match the prepared test-panels. Provide a 50 to 75 micron 2 to 3 mil
surface profile. Reject profile greater than 75 microns 3 mils,
discontinue abrasive blasting, and modify processes and materials to
provide the specified profile. Measure surface profile in accordance with
ASTM D 4417. Measure profile at rate of three tests for the first 100
square meters 1000 square feet plus one test for each additional 100 square
meters 1000 square feet or part thereof. Provide two additional
measurements for each non-compliant measurement. When surfaces are
reblasted for any reason, retest profile as specified. If Method C of ASTM
D 4417 is used to measure profile, attach test tapes to Daily Inspection
Reports. Following abrasive blasting, remove dust and debris by vacuum
cleaning.
3.8.5
Disposal of Used Abrasive
Dispose of used abrasive off Government property in accordance with
Federal, State and Local mandated regulations.
3.8.6
Pre-Application Testing For Surface Contamination
3.8.6.1
Pre-Application Testing for Oil and Grease Contamination
Ensure tank surfaces are free of contamination as described in Article
entitled "Pre-Preparation Testing for Oil and Grease Contamination."
3.8.6.2
Pre-Application Testing for Soluble Salts Contamination
**************************************************************************
NOTE: In new tanks, require 30% of tests to be
accomplished at welds. In tanks that have been in
service, corroded areas should be tested for high
chlorides.
**************************************************************************
Test surfaces for chloride contamination using the Test Kit described in
article entitled "Test Kit for Measuring Chlorides on Steel Surfaces." Test
all surfaces at rate of three tests for the first 100 square meters 1000
square feet plus one test for each additional 200 square meters 2000 square
feet or part thereof. [Concentrate testing of bare steel at areas of
coating failure to bare steel and areas of corrosion pitting. ][Perform
30% of tests on bare steel at welds, divided equally between horizontal and
vertical welds. ]One or more readings greater than 3 micrograms per square
centimeter of chlorides is evidence of chloride contamination. Reject
contaminated surfaces, wash as discussed in article entitled
"Pre-Preparation Testing for Soluble Salts Contamination," allow to dry,
and re-test until all required tests show allowable results. Reblast
tested areas using vacuum equipped blast equipment. Label all test tubes
and retain for test verification.
3.8.6.3
Pre-Application Testing for Surface Cleanliness
Apply coatings to dust free surfaces. To test surfaces, apply strip of
clear adhesive tape to surface and rub onto surface with finger. When
removed, the tape should show little or no dust, blast abrasive, or other
contaminant. Reject contaminated surfaces, clean by vacuum cleaning, and
retest. Test surfaces at rate of three tests for the first 100 square
meters 1000 square feet plus one test for each additional 100 square meters
1000 square feet or part thereof. Provide two additional tests for each
failed test or questionable test. Attach test tapes to Daily Inspection
SECTION 09972
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