U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
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| This report is an archived publication and may contain dated technical, contact, and link information |
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Publication Number: FHWA-RD-98-084
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The information in this manual does not necessarily represent current practice. It is on this site for archival reference purposes only. FHWA Field Manual for Bridge Painting InspectionSurface Preparation
Date:_____________ Inspector:__________________
SP-1: Surface has been cleaned. No remaining dirt, oil, or grease. ___ SP-2: Surface has been hand tool cleaned and is free of all loose mill scale, loose rust, loose/defective paint, weld flux, slag, and spatter. ___ SP-3: Surface has been power tool cleaned and is free of all loose mill scale, loose rust, loose/defective paint, weld flux, slag, and spatter. Power tools have not put any grease or oil back onto the surface. ___
Sample the abrasive. Verify it is free of grease, oil, or other contaminants. ___ Inspect air supply. Verify, with blotter cloth, air is free of oil, water, and other contaminants. ___ Blasting pressure is at least 620 kPa (90 psi) or higher if recyclable grit is used. ___ SP-6: Surface has been blast cleaned and is free of all rust, mill scale, paint, and foreign matter (except for slight shadows, streaks, or discoloration caused by rust stains, mill scale stains, and tight residue of previous coatings). At least two-thirds of each 150-cm² (9 in²) area must be free of all visible residue with the remainder limited to the discolorations noted in the standard. ___ SP-10: Surface has been blast cleaned and is free of all rust, mill scale, paint, and foreign matter (leaving only slight stains from rust and mill scale). At least 95% of each 150-cm² (9 in²) area should be free of all visible residue with the remainder limited to slight staining. ___ The anchor pattern has been verified using a micrometer and replica tape. ___ U.S. Department of Transportation |
