NAVSEA Documents. Topics. Scope. Learning Outcome. Relevant Documents. NAVSEA Basic Paint Inspector Training: NAVSEA Documents

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1 NAVSEA Basic Paint Inspector Training: NAVSEA Documents NAVSEA Documents Topics l NAVSEA documents related to preservation of ships l Practical exercise on use of these document NAVSEA Basic Paint Inspector Training! Scope Learning Outcome l Gets students acquainted with guidance documents for the preservation of ships l Students will be able to identify the major NAVSEA guidance documents concerning the preservation of ships and describe how to use them in their work NAVSEA Documents Concerned with Ship Coatings l NSTM Chapter 631 l NSTM Chapter 634 l NAVSEA Standard Item l NAVSEA Standard Item l NAVSEA Coating Performance Specifications and their QPDs and NAVSEA-Reviewed ASTM F718 Data Sheets Relevant Documents l NSTM Chapter 631 and 634 Naval Shipyards, IMAs, Ships Force l NAVSEA Standard Item Naval contractors (ships in service) l Preservation Process Instructions (PPIs) Invoked by both NSTM 631 and l SUBMEPP Preservation Standard Submarine community l Ship Specifications New construction 4 1!

2 NAVSEA Basic Paint Inspector Training: NAVSEA Documents NSTM Chapter 631 NSTM Chapter 631 Section 1 Introduction Section 2 Safety Section 3 Paint Equipment Section 4 Reconditioning of Flooded and Smoke- Contaminated Equipment Section 5 Surface Preparation Section 6 Paint Application Guidance and Requirements Section 7 Paint Application Procedures Section 8 Shipboard Paint Application Section 9 Boats and Small Craft Section 10 Naval Ships Marking and Awards Section 11 Quality Assurance for Critical Coated Areas Section 12 Preservation Process Instructions NSTM Chapter 631 l Preservation Process Instructions (PPIs), now Section 12 of NSTM 631, are available at: Summary of Coating Requirements! Table NAVSEA Standard Item l Defined critical coated areas and definitions of technical terms l Blast cleaning, including profile l General and special applications l Use of specialized coatings l Eight tables of systems for different areas l QA Inspection forms NAVSEA Standard Item (cont d.) l Will soon be used by both contractors and the Government l Applies to submarines l contains new tables and notes pertaining to submarines l QA forms now reside at The forms are still part of , but are no longer physically included in the document 4 2!

3 NAVSEA Basic Paint Inspector Training: NAVSEA Documents NAVSEA Standard Item l Corrective and preventive action programs (CA/PA) l A test and inspection plan l Documentation procedures NAVSEA Coating Performance Specifications l NAVSEA is responsible for many performance specifications for coatings for ships (e.g., MIL-PRF and MIL- DTL for tanks. MIL-PRF for anti-corrosive and antifouling systems) l These specifications usually have QPDs and NAVSEA-Reviewed ASTM F718 Data Sheets NAVSEA-Reviewed ASTM F718 Data Sheets l Generic type and description l Manufacturer s data l Properties l Surface preparation minimum requirements l Mixing procedures l Application Team Exercises l Complete the following two exercises using the appropriate NAVSEA documents. Summary l Describe and know how to use the NAVSEA guidance documents for the preservation of ships l The different documents relate to different aspects of shipboard corrosion control by coatings 4 3!

4 NAVSEA Basic Paint Inspector Training: Non-Mechanical (Chemical or Detergent) Cleaning Methods Non-Mechanical (Chemical or Detergent) Cleaning Methods Topics l Solvent cleaning l Chemical cleaning l Steam cleaning l Detergent/water cleaning NAVSEA Basic Paint Inspector Training! Scope l Get students acquainted with the use of liquid products used in cleaning surfaces of ships prior to coating Learning Outcome l Students will be able to describe these cleaning methods and identify their typical uses, advantages, and limitations Solvent Cleaning Ultraviolet Light Test l SSPC-SP1 All Metals Oily or greasy parts or surfaces Initial wipe down Final wipe down Penetrates small crevices Simple to Accomplish Air pollution regulations HAZMAT storage, disposal Health hazard Effects on non-metals l U/V light can be used after solvent and other cleaning methods to verify oil & grease removal l When hydrocarbons are present, the hydrocarbons will fluoresce as bright green, lime green, or blue/ violet on the surface l A water break-free test is sometimes specified for this purpose 5 1!

5 NAVSEA Basic Paint Inspector Training: Non-Mechanical (Chemical or Detergent) Cleaning Methods Ultraviolet Light Test Acid Cleaning l The CORE PPI requires a U/V light test as a pre-surface preparation checkpoint, to prevent embedding contaminants. l Inspect surface using a UV light to detect hydrocarbons on the surface. The UV light will not allow the proper detection of hydrocarbons on the surface if the surface being inspected is exposed to day or artificial light. For proper UV light hydrocarbon detection, lights must be off for interior spaces, and the inspection must be conducted during darkness for surfaces exposed to sunlight. Iron and Steel Only Cleaning of small parts Rust removal Removes mill scale and rust Surface etching promotes adhesion Penetrates crevices and pits Can t use for aluminum Multi-step process Environmental precautions Steam Cleaning Pickling (SSPC-SP 8) Iron Alloys Steel Alloys Copper Alloys Some Al Alloys Tanks and Voids Piping Systems Removing Preservatives Can soften/loosen old paint Residual salt removed No chemicals involved Penetrates pits Quick removal of deposits on large areas Limited shipboard uses Need source of steam Iron Alloys Steel Alloys Shop use for mill scale removal on large steel plate shapes Complete mill scale and rust removal Shipyard/industrial use only Environmental and health precautions Not effective for oil and grease removal Can t use on Al or stainless steel Alkaline Cleaning Detergent and Water Cleaning Iron Alloys Steel Alloys Bilge cleaning Tank cleaning More efficient/less costly than solvents Removes grease and oil Penetrates pits Handling/disposal of solutions Complicated procedure Cannot use in submarine bilges Cannot use on aluminum Any Metal Most non-metals Light soil and oil removal Most are environmentally friendly Simple process Oily water separators not effective Not effective for heavy oil or grease 5 2!

6 NAVSEA Basic Paint Inspector Training: Non-Mechanical (Chemical or Detergent) Cleaning Methods Low Pressure Water Cleaning l Generally done at pressures less than 5,000 psi Not to be confused with hydroblasting or water-jetting l NSTM Ch. 631, Section 5 calls for use of fresh water washing at less than 5,000 psi after abrasive blasting to remove salts from critical areas and topside surfaces. Wash water shall not contain corrosion inhibitors See also paragraph 631, Section 5 for different requirements for well deck overheads. Other Surface Treatment Methods l Intended for shop use, parts and components l Pretreatments intended to provide a better surface to enhance paint adhesion and performance Conversion Coatings: aluminum alloys Anodizing: aluminum alloys Phosphate Coating: iron, steel, and galvanized surfaces l Electrocoating (E-coat): metallic substrates Summary l Defined solvent, chemical, steam, and detergent/water cleaning as a means of cleaning ship surfaces prior to coating l Described those cleaning methods according to NSTM Chapter 631, Section 5 5 3!

7 NAVSEA Basic Paint Inspector Training: Mechanical Cleaning Methods Mechanical Cleaning Methods Surface Preparation NAVSEA Basic Paint Inspector Training! Topics l Hand and power tool cleaning l Power tool cleaning to bare metal l Factors affecting surface preparation Scope l Gets students acquainted with methods of mechanical cleaning and when they are most commonly used on ships Learning Outcome l Students will be able to discuss the operational and safety aspects of mechanical cleaning tools and identify the specifications for mechanical cleaning methods l Typical Hand Tools Paint scraper Chipping hammer Putty knife Wire brushes Abrasive cloth or sand paper Greenie pads Hand Tool Cleaning 6 1!

8 NAVSEA Basic Paint Inspector Training: Mechanical Cleaning Methods Hand/Power Tool Cleaning l Covered by SSPC-SP 2 and SSPC-SP 3 SSPC-SP 2 Hand Tool Cleaning SSPC-SP 3 Power Tool Cleaning Requires that only loosely adhered material be removed NO surface profile specified or required Best for tight areas and areas where corrosion is not serious (touch-up) l Note: difficult to remove weld spatter by specifying SP 2 & 3 Hand/Power Tool Cleaning l SSPC-SP 2 and SP 3 may be called out in NSTM Chapter 631 for Minimum Spot Repair Surface Preparation Hand/Power Tool Cleaning l General Procedure: clean area with solvent or detergent prior to hand tool cleaning (SSPC-SP 1) use vacuum or other method to clean up dust and debris use clean tools constructed of materials which will not contaminate the surface being cleaned consult SSPC-VIS 3 for comparative visual references for hand and power tool cleaned steel surfaces l Visual reference l Used as an aid for determining if the specified cleanliness level has been attained l VIS 3 covers SSPC-SP 2, SP 3, SP 15 and SP 11 SSPC-VIS 3 SSPC-VIS 3 l There are starting conditions based on new steel and there are three grades for previously painted surfaces l For SP 3 Power Tool Cleaned surfaces, there are different photos for surfaces treated by: Power Wire Brush (PWB) Sanding Disk (SD) Needle Guns (NG) l Typical Power Tools Rotopeen Needle gun Disc sanders Deck abraders Belt sanders Power Tool Cleaning to Bare Metal 6 2!

9 NAVSEA Basic Paint Inspector Training: Mechanical Cleaning Methods Power Tool Cleaning to Bare Metal l Covered by SSPC-SP 11 Removes all rust and paint to bare metal Provides a surface profile (1.0 mil minimum) requires a minimum 2 mil profile for critical coated areas and a 1 mil minimum for others Vacuum shrouded equipment available to contain dust and debris For heavily corroded areas, can be very expensive Commercial Grade Power Tool Cleaning l Covered by SSPC-SP 15 Intermediate between SP 3 and SP 11 Removes all oil, grease, dirt, rust, mill scale, coating, etc. Random staining on no more than 33% of each 9 square inch of surface 1 mil minimum profile required requires a minimum 2 mil profile for critical coated areas and a 1 mil minimum for others Not normally applicable to critical coated areas unless approved by the RMC Power Tool Cleaning Power Tool Cleaning l Covered by SSPC-SP 3 Removes loosely adherent material only (loosely adherent = can be removed with a dull putty knife) No minimum profile requirements as in SP 11 and SP 15 Burnishing of the surface is not permitted l General Procedure: clean area with solvent or detergent (SSPC-SP 1) prior to power tool cleaning use vacuum or other method to clean up dust and debris consult SSPC-VIS 3 for comparative visual references for power tool cleaned steel surfaces ensure proper PPE is used Feathering Surface Preparation New Paint! Old Paint! Feathering prevents premature failure of coatings applied over existing coatings. l Sharp corners can present a severe coating problem: surface tension causes coatings to pull away from sharp edges resultant paint film is too thin, easily broken l These problems can be prevented by: rounding the corners with a 2-3 mm radius (a time consuming and expensive process) applying edge retentive coatings 6 3!

10 NAVSEA Basic Paint Inspector Training: Mechanical Cleaning Methods Edge Failure of Coating Weld Joints The coating on the edge of this deck support has failed and corrosion has begun l Welds can be porous, weakly bonded, or have sharp projections l Weld spatter is most difficult to remove l Welds should be ground smooth for optimum coating performance, often not permitted Weld crown may be part of joint design NDE may be required after weld grinding l Contouring/dressing of weld should be done, if weld is not ground flat Weld Joints Poor Weld Preparation l NSTM Chapter 631 required welds to be ground within 1/16 of surface of the surrounding metal l This requirement will be edited to address different situations, with corresponding guidance in Navy welding policy document l NACE visual comparator "Surface Finishing of Welds", a cast plastic model with varying weld joints and finishes, may be invoked. This standard accompanies NACE RP 0178 The weld seam on this ventilation ducting was not properly prepared and the coating soon failed! Summary l Described using hand and power tool cleaning as a surface preparation method l Hand tools (SSPC-SP 2) are best used in areas where corrosion is not serious l Power tool cleaning (SSPC-SP 11) is used for spot repair and touch-up of disturbed coatings in small areas. l Commercial grade power tool cleaning (SSPC-SP 15) may be used if approved by NAVSEA technical authority on the bottoms of pad eyes prior to waterjetting l Feathering, rounding sharp corners, smoothing irregular weld seams and removing slag, and sanding intact paint can all assist in better surface preparation 6 4!