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1 1 I. Prior to assembly, all surfaces made inaccessible after assembly shall be prepared as 2 specified herein and shall receive the coating or paint system specified. 3 a 3.02 SURFACE PREPARATION, METALLIC SURFACES 5 6 A. Surface preparation will be based on comparison with: "Pictorial Surface Preparation 7 Standards for Painting Steel Surfaces", SSPC-Vis 1, ASTM Designation D220: "Standard 8 Methods of Evaluating Degree of Rusting on Painted Steel Surfaces", SSPC-Vis 2, ASTM s Designation D610; "Visual Standard for Surfaces of New Steel Air-blast Cleaned with Sand 10 Abrasive", NACE Standard TM-01-70; and as described below. Anchor profile for prepared 11 surfaces shall be measured by use of a non-destructive instrument such as a Keane-Tator 12 Surface Profile Comparator or Testex Press-O-Film System. 13 14 To facilitate inspection, on the first day of abrasive blast cleaning operations, blast clean 15 metal panels to the standard specified. These panels shall be equivalent to the supplied 16 plate stock which is to be coated or painted and shall have minimum measurements of 8- 17 1/2 inches by 11 inches. After agreeing a specific panel meets the requirements of the 18 specification, it shall be initialled by the Contractor and Engineer and coated with a clear 19 non-changing finish. Panels shall be utilized for inspection purposes throughout the 20 duration of blast cleaning operations. 21 22 B. Heavy deposits of grease or oil shall be removed with solvent oil cleaner and any chemical 23 contamination shall be neutralized and/or flushed off prior to any other surface preparation. 24 25 C. Surfaces scheduled for Near White or Commercial Blast Cleaning shall have all welds, 26 edges, and sharp corners ground to a 1/16-inch radius and all weld splatter removed, and 27 sandblasted in accordance with Steel Structures Painting Council Specifications, removing 28 mill scale, rust, dirt, paint, or other foreign matter, and shall be slightly roughened to form 29 a suitable anchor pattern for the coating application. Do not leave blasted surfaces 30 overnight before coating. Remove all sand from the surface by brush or industrial vacuum. ' 31 32 D. All other steel not scheduled for blast cleaning shall have all weld splatter removed, an 33 rough edges and rough welds ground, and shall be cleaned by means of hand or power 34 tools, in accordance with Steel Structures Painting Council Specification No. 2 or No. 3, 35 removing all loose mill scale rust, dirt, paint, or other contaminants. Blast cleaning may be 36 used if practical. The remaining mill scale, rust, and paint must be sufficiently abraded to 37 provide for good bonding of the coating. ' 38 39 E. Field blast cleaning for all surfaces shall be dry method unless otherwise directed. ao 41 F. Particle size of abrasives used in blast cleaning shall be that which will produce a 2 mi 42 (50.0 microns) surface profile or in accordance with recommendations of the manufacturer 43 of the specified coating or paint system to be applied. as 45 G. Abrasive used in blast cleaning operations shall be new, washed, graded and free o 46 contaminants that would interfere with adhesion of coating or paint and shall not be reused 47 unless specifically approved by the Engineer. ae as H. During blast cleaning operations, caution shall be exercised to insure that existing coatings 50 or paints are not exposed to abrasion from blast cleaning. 51 1 52 I. Keep the area of work in a clean condition and not permit blasting materials to accumulate PAINTING 051194 09900-7