c. Medium Sand Blast Finish:Generally expose coarse aggregate; 3/16-inch to 1/4-inch reveal. 3. Surface Continuity:Perform sand blast finishing in as continuous an operation as possible, utilizing the same work crew to maintain continuity of finish on each surface or area of work. Maintain patterns of variances in depths of cuts as indicated. 4.
Advanced Metal Fabrication & Finishing Sandblasting Abrasive media blasting is the process by which an abrasive media is accelerated through a blasting nozzle by means of compressed air. The abrasive used varies based on the surface treatment required. Here in Erie, PA at Advanced Metal Fabrication & Finishing, the media we use are Sand, Glass Bead, Steel Grit and Soda.
Press-O-Film Testex replica tape can be used with a gauge to measure the surface roughness (profile) of blast-cleaned steel in the roughness range 0.8 to 4.5 mils (or 20 to 115 micrometers).
Grit Finish and Estimated RMS and Ra Values RMS Ra Ra Grit Finish and Estimated RMS and Ra Values Grit Finish RMS (Micro-inch) RMS (Micron) Ra (Micro-inch) Ra (Micron) 36 160 4.06 142 3.61 60 98 2.49 87 2.21 80 80 2.03 71 1.8 120 58 1.47 52 1.32 150 47 1.2 42 1.06 USDA Bead Blast 47 1.2 42 1.06 180 34 0.86 30 0.76 220 21 0.53 19 0.48 240 17 0.43 15 0.38 320 14 0.36 12 0.3 400 10 0.25 9 0.23
Leveraging Stainless Steel Finishes on Sanitary EquipmentNo. 3 Finish The No. 3 Finish uses a 120 grit abrasive. It has a semi-polished finish with an RA range of 36 - 58 microinches. No. 4 Finish This finish uses a 150 grit abrasive, and shows a pol - ished brushed surface. The RA range is 29 - 40 microinches. No. 4/ Dairy For processing industries, the number 4
8.4.3 Grit-Blasting Grit-blasting or sandblasting, if available, may also be used. A specially-trained operator is needed to produce uniformity within pieces by sandblasting. A clean, uniform-size grit is essential for proper surface preparation with sandblasting.
Steel Surface Preparation - Industrial Paint and Mar 11, 2018 · Skip to SSPCs steel surface preparation standards. Steel surfaces need to be treated to prevent corrosion over the course of an assets lifetime. Surface preparation is the first step in this process. When defects are removed and the surface is properly cleaned, coating adhesion and performance improve. Steel surface preparation removes the physical defects and 
Surface Finish & Surface Roughness It's Indications
Surface Finish and Surface RoughnessSymbols For Indicating Surface FinishIndication of Surface Roughness ValuesIndication of Surface Roughness GradesIndication of Surface Roughness by Triangle SymbolSurface Roughness Conversion Chart Tables- Engineers EdgeSurface Roughness Value Equivalents . The Waviness is the measure of surface irregularities with a spacing greater than that of surface roughness. These usually occur due to warping , vibrations , or deflection during machining. ASME B46.1 . ASME Y14.36M - 1996 Surface Texture Symbols .
Abrasive blasting wont remove oil and grease it just smears them over the surface, causing premature coatings failure. Visible deposits of oil, grease and dirt must be spot cleaned prior to abrasive blast cleaning. SP 1 is a prerequisite to the other SSPC abrasive blasting specifications.