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The NSRP Surface Preparation & Coatings (SP&C) Panel 2018 Update
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According to the international surface preparation standard for welds (ISO8501-3), the preparation grades before the application of paints are divided into 3 levels, P1, P2 and P3. These grades are described with rough qualitative representations, not description of surface treatment methods or measurable conditions. Because of the ambiguous wordings on the standard, there have been a lot of arguments for the surface preparation grades and abraded condition during the construction.
During the construction of a 56km long 16 in. carbon steel sour gas pipeline, repetitive surfacepreparation failures were detected during visual inspection of pipeline girth weld internal surface prior tocoating application. Such failures represented 67% of the total pipeline girth welds and were manifestedby excessive sharp-edges at the root pass. To identify the failure causes, an investigation wasperformed through reviewing the pipeline, fabrication and coating application specifications andprocedures, quality control records and performing an extensive visual inspection through an advancedvideo robotic crawler on all pipeline girth welds made. Upon investigation analysis, the failures werecaused by sharp-edges in the root pass which were attributed to improper practices duringmanufacturing, field fabrication and pre-coating quality control. The failure analysis indicated that themechanized Gas Metal Arc Welding process, with the parameters used, was not suitable for internalgirth weld coating application. In addition, a more stringent requirement should be applied to theacceptable pipe-end diameter tolerance and pre-coating quality control to ensure absence of similarpremature surface preparation failures. The pre-coating quality control can be improved throughutilization of robotic laser contour mapping crawler for precise detection and sizing of unsatisfactorysurface weldment defects, including sharp edges.
Characteristics of water blasting methods. Equipment required. Operating procedures. Safety precautions and methods. Time requirement tables. Classifications of items, structures and surface conditions successfully cleaned. Historical Document 1972
This Surface Preparation Commentary (SP COM) is intended to be an aid for the coating specifier in selecting methods, materials, and standards for specifying the proper surface preparation for steel, and other metals (not including ductile iron pipe). The use of these standards in a coating specification will give direction to the contractor regarding what is required and give direction to the inspector on verifying compliance to the specification.
HISTORICAL DOCUMENT. Requirements for "Near-White Metal" - one of five levels of cleanliness of steel surfaces achieved by blast cleaning with the use of abrasives. (White Metal, Near-White Metal, Commercial, Industrial, Brush Off)
This case study shows how the City of Virginia Beach addressed concrete tank foundation deterioration and steps taken to reduce future deterioration, including moisture control, impact of Alkali Silica Reaction, concrete analysis and proper surface preparation, coatings applications and inspection.
The paper is an overview of the National Shipbuilding Research Program (NSRP) Surface Preparation and Coating Panel’s (SP&C) mission to reduce the cost of construction, maintenance, and repair of US Navy ships. The Panel’s “Specs to Decks” approach; research, evaluate, develop, and sustain current and emerging technologies that will reduce cost and maintain or enhance quality, serves as a rudder that guides the Panel’s performance.
This paper introduces a novel method for chemical surface preparation of concrete surfaces that has been recognized by ASTM under a recent revision of ASTM D4260. Contractors will learn current methods used to prepare concrete in order to receive coatings.
The most commonly accepted way to protect structural steel on bridges is with liquid applied coatings (paint). The current life expectancy for field-applied protective coatings (maintenance painting) is about 20 years in snow/ice and marine areas. Most bridge owners use a remove-and replace strategy for maintenance painting, with unit costs usually in excess of $10.00 per ft. The cost of maintaining a protective coating during the service life of a bridge may approach the bridge’s original construction costs.
Fiberglass-reinforced plastic (FRP) linings are used worldwide to prevent the corrosion and deterioration of storage tank bottoms in petroleum, petrochemical, and other services. Experience has shown that the useful life of an FRP lining may exceed 25 years. API Standard 653 permits a minimum remaining thickness of the tank bottom plate to be 1.25 mm (0.050 in) when lined with FRP compared to a thickness of 2.5 mm (0.10 in) if unlined or lined with a nonreinforced coating system and not equipped with a tank bottom leak detection system.