Paint Coatings for Ammonia Refrigeration Piping and Vessels

Protective & Marine Coatings Protective & Marine Coatings

Paint Coatings for

Ammonia Refrigeration

Piping and Vessels

May 8, 2014

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

Agendum

Surface preparation

Types of coatings

Coating system selection

The Purpose of Coatings

• Beautify and Decorate

• Identification

• Asset Protection

Types of Piping Underground

Buried

Above ground

Insulated

High Temperature

Why does corrosion occur?

ACME

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

Paint Problems

Coating failures directly attributed to inadequate surface preparation

20%

80%

Other causes

Surface Preparation

Clean

Dry

Dull

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

Protective & Marine Coatings

SP-3 Surface Preparation

SP6 Commercial Blast

Started With Rust Grade B Started With Rust Grade D

Surface Preparation for Concrete

ICRI Technical Guide No. 03732

Vehicle

Composition of paint C

OM

PO

NE

NT

S

Corrosion Weathering Zinc / epoxy / urethane Epoxy / urethane

VOC Regulated Locations

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)

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)

Pigment Selection to Improve Corrosion Resistance

H2O / O 2 H2O / O 2

Metal Metal

LamellarPigmentPigment

GranularPigmentPigment

New Epoxy Technology

Edge Retentive

Maintain > 70 % Of Film Build At Sharp Edges

Eliminate Film Shrinking during Cure

Edge retention

Moisture Cure Urethane for in service painting:

Epoxy with Optically Activated Pigment (OAP)

Please don’t

Overcoat vs. Removal

Factors

• Percentage of rust

• Adhesion

• Dry film thickness

SSPC-VIS 2

Degree of rusting

• 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

Evaluating Dry Coating

Thickness (Destructive)

Shear Adhesion Test Kits

Measurement of Dry Coating Thickness (Non-Destructive)

.

Risk Assessment

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)

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)

Ferrous Metal Painting Schedule

COATING SYSTEM C:

Prep: Commercial Blast Cleaning per SSPC-SP6

Prime: Silicone Acrylic Primer

Finish Coat: Silicone Acrylic (color)

Ferrous Metal Painting Schedule

COATING SYSTEM C:

Prep: Commercial Blast Cleaning per SSPC-SP6

Prime: Silicone Hybrid Primer

Finish Coat: Silicone Hybrid (color)

I don’t need coatings under sealed insulation, right?

Corrosion Under Insulation (CUI)

NACE SP0198-2010 –

Authoritative Handbook on Corrosion Under Insulation Table 2 – Page 25

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

Industries Served

Passive Fire Protection:

Hydrocarbon and Cellulosic

Questions?

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)