Page 641 - Corrosion Engineering Principles and Practice

600 C h a p t e r 1 4 P r o t e c t i v e C o a t i n g s 601

C 5-M 9 15 15 5 6

C 5-I 7 15 14 5 6

C 3 14 21 21 8 9

C 2 15 30 29 12 14

DFT 1.8 2.3 2.3 1.5 2.0

Number of Coats 3 3 3 2 3

Surface Preparation Hand/power Blast Blast Hand/power Hand/power All estimates (in years) are for the “Practical” life of the system. Practical life is considered to be the time until 5 to 10% coating breakdown occurs Hand/Power—Requires SSPC-SP 3 “Power Tool Cleaning” or SP 2 “Hand Tool Cleaning”.

Coating Systems for Atmospheric Exposure (primer/midcoat/to coat) MCU penetrating sealer/MCU/MCU Zinc rich MCU/polyurethane/ polyurethane Zinc rich MCU/MCU/MCU Universal primer/epoxy Universal primer/epoxy/polyurethane (SSPC-Vis 2 Grade 4), and active rusting of the substrate is present. 4. Service Life Enviro

Moisture Curing Polyurethane (MCU) Moisture Curing Polyurethane Moisture Curing Polyurethane 1. Service Life Estimates: 2. Surface Preparation Definitions: “Near White Blast”. 3. DFT is the dry film thickness in mm. 5. Typical Maintenance Painting Sequence: Maintenance Repaint occurs at “P ” Life

Type Misc Misc Notes: TABLE 14.2