PCS Coating Systems and Specifications Flashcards

A coating specification requires a 'holiday-free' lining. Which test method is used to detect pinholes and voids in an immersion-service lining?

Answer: High-voltage spark testing

High-voltage spark (holiday) testing uses an electrical current to locate discontinuities in immersion-service linings where pinholes would allow corrosive media to reach the substrate.

Which resin type is generally preferred when a coating specification calls for chemical resistance to hydrocarbon solvents?

Answer: Epoxy

Epoxy coatings offer superior chemical and solvent resistance due to their highly cross-linked structure, making them the preferred choice for hydrocarbon environments.

What does 'pot life' mean in a coating specification for a two-component product?

Answer: Time the mixed coating remains usable after mixing

Pot life is the period during which a mixed two-component coating maintains its workable viscosity and can be applied before cross-linking renders it unusable.

When a specification states 'theoretical spreading rate of 320 sq ft/gal at 5 mils DFT,' what adjustment must a contractor make in practice?

Answer: Apply a loss factor for overspray, runs, and waste

Theoretical spreading rates must be adjusted by a realistic application efficiency or loss factor (typically 20–30%) to account for overspray, material waste, and surface irregularities.

Which standard provides minimum requirements for protective coating specifications on steel structures?

Answer: SSPC-CS 23.00

SSPC-CS 23.00 provides minimum requirements for the content and format of protective coating specifications for steel structures.

A coating specification calls for a minimum 'overlap' on stripe coats. What is the purpose of a stripe coat?

Answer: To ensure edges, welds, and corners receive adequate film build

Stripe coats are applied by brush or roller specifically to edges, welds, bolts, and corners where spray application produces insufficient film build due to surface geometry.