paint coatings for ammonia refrigeration piping and vessels
TRANSCRIPT
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Protective & Marine Coatings Protective & Marine Coatings
Paint Coatings for
Ammonia Refrigeration
Piping and Vessels
May 8, 2014
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Protective & Marine Coatings Protective & Marine Coatings
Welcome
May 8, 2014
Paint Coatings for Ammonia
Refrigeration Piping and Vessels
Bradley D. Dahlgren CSI, CCPR, MBA, NACE Certified Coating Inspector, CIP #10538
Project Development Manager
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Agendum
Surface preparation
Types of coatings
Coating system selection
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The Purpose of Coatings
• Beautify and Decorate
• Identification
• Asset Protection
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Types of Piping Underground
Buried
Above ground
Insulated
High Temperature
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Why does corrosion occur?
ACME
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How Coatings Provide Protection
Most coatings serve as a
protective barrier by isolating the substrate from
the environment.
Barrier
Some pigments used in primers
control corrosion by containing rust
inhibitive compounds.
Inhibitive
When a zinc coating is applied to steel, the zinc sacrifices itself to protect the steel.
Sacrificial
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Paint Problems
Coating failures directly attributed to inadequate surface preparation
20%
80%
Other causes
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Surface Preparation
Clean
Dry
Dull
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Surface Preparation Standards
SSPC-SP1 Solvent Cleaning SSPC-SP2 Hand Tool Cleaning SSPC-SP3 Power Tool Cleaning SSPC-SP5 (NACE No. 1) White Metal Blast Cleaning SSPC-SP6 (NACE No. 3) Commercial Blast Cleaning SSPC-SP7 (NACE No. 4) Brush-Off Blast Cleaning SSPC-SP10(NACE No. 2) Near-White Blast Cleaning SSPC-SP11 Power Tool Cleaning to Bare
Metal SSPC-SP12(NACE No. 5) High and Ultrahigh Pressure
Water Jetting Prior to Recoating SSPC-SP13(NACE No. 6) Surface Preparation of Concrete SSPC-SP14(NACE No. 8) Industrial Blast Cleaning SSPC-SP16 Brush-off Blast Cleaning of
Galvanized steel, Stainless steels, and Non-ferrous metals
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Protective & Marine Coatings
SP-3 Surface Preparation
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SP6 Commercial Blast
Started With Rust Grade B Started With Rust Grade D
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Surface Preparation for Concrete
ICRI Technical Guide No. 03732
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Vehicle
Composition of paint C
OM
PO
NE
NT
S
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Corrosion Weathering Zinc / epoxy / urethane Epoxy / urethane
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VOC Regulated Locations
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OTC Coating Categories
VOC Limits for 53 Categories
• Flat Coatings (100 grams per liter)
• Non-Flat Coatings (150 grams per liter)
• Primers, Sealers and Undercoaters (200 grams per liter)
• Specialty Primers (350 grams per liter)
• Industrial Maintenance Coatings (340 grams per liter)
• Rust Preventive Coatings (400 grams per liter)
• Dryfall coatings (400 grams per liter)
• Sanding Sealers (350 grams per liter)
• Varnishes (350 grams per liter)
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Types of Coatings
Identified by Resin Type:
Alkyd (oil base)
Acrylic (type of latex)
Epoxy (Bis A, Bis F, and Novolac)
Polyurethane
Identified by Pigment Type:
Inorganic Zinc
Organic Zinc (epoxy or urethane)
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Pigment Selection to Improve Corrosion Resistance
H2O / O 2 H2O / O 2
Metal Metal
LamellarPigmentPigment
GranularPigmentPigment
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New Epoxy Technology
Edge Retentive
Maintain > 70 % Of Film Build At Sharp Edges
Eliminate Film Shrinking during Cure
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Edge retention
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Moisture Cure Urethane for in service painting:
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Epoxy with Optically Activated Pigment (OAP)
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Please don’t
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Overcoat vs. Removal
Factors
• Percentage of rust
• Adhesion
• Dry film thickness
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SSPC-VIS 2
Degree of rusting
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• ASTM D 3359 (shear [tape/knife] adhesion) – Method A, “X-Cut”
• Use for coatings greater than 5 mils • Rate result according to description in standard
– Method B, “Cross-Cut” • 0–2 mils = 1mm spacing between cuts • 2–5 mils = 2 mm spacing between cuts • Rate result according to adhesion chart
in standard
Adhesion Testing
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Evaluating Dry Coating
Thickness (Destructive)
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Shear Adhesion Test Kits
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Measurement of Dry Coating Thickness (Non-Destructive)
.
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Risk Assessment
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Ferrous Metal Painting Schedule
COATING SYSTEM A:
Spot Prep: Hand Tool / Power Tool Cleaning per SSPC-SP2/3
Spot Prime: Epoxy (flake filled)
First Coat: Epoxy (flake filled)
Finish Coat: Polyurethane (exterior)
or, Epoxy (interior)
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Ferrous Metal Painting Schedule
COATING SYSTEM B:
Prep: Commercial Blast Cleaning per SSPC-SP6
Prime: Epoxy (flake filled)
Stripe Coat: Epoxy (flake filled)
Finish Coat: Polyurethane (exterior)
or, Epoxy (interior)
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Ferrous Metal Painting Schedule
COATING SYSTEM C:
Prep: Commercial Blast Cleaning per SSPC-SP6
Prime: Silicone Acrylic Primer
Finish Coat: Silicone Acrylic (color)
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Ferrous Metal Painting Schedule
COATING SYSTEM C:
Prep: Commercial Blast Cleaning per SSPC-SP6
Prime: Silicone Hybrid Primer
Finish Coat: Silicone Hybrid (color)
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I don’t need coatings under sealed insulation, right?
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Corrosion Under Insulation (CUI)
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NACE SP0198-2010 –
Authoritative Handbook on Corrosion Under Insulation Table 2 – Page 25
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Corrosion Under Insulation
NACE SP0198-2010 – Authoritative Handbook
System CS-3……Phenicon HS or FF
Temps to 300°F
System CS-4……Epo-Phen
Temps to 400°F
System CS-6……Heat-Flex Hi-Temp 1200
Temps to 1200°F
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Industries Served
Passive Fire Protection:
Hydrocarbon and Cellulosic
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Questions?
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Protective & Marine Coatings
Resources
• www.sspc.org
– (for surface prep and Vis standards)
• www.sherwin-williams.com
– (for coating technical sheets and information)
• www.nace.org
– (for more information on surface prep standards)