Mixed Deck — All PCS Topics Flashcards

How should hazardous conditions be handled during material selection work?

Answer: Stop work, secure the area, report the hazard, and follow safety protocols

All hazardous conditions require immediate action: stop work, secure the area, report the hazard, and follow established safety protocols.

What is a key reason for applying a coat after the minimum recoat time but before the maximum recoat window ends?

Answer: To ensure good intercoat adhesion without having to abrade the surface

Recoating inside the window allows chemical or mechanical bonding between coats, while going past it often requires abrading or a tie coat.

Why is adhesion testing important in coating inspection?

Answer: To evaluate coating bond strength

Adhesion testing is vital because it assesses how well a coating sticks to the substrate or to previous coating layers. Strong adhesion is critical for the long-term performance and durability of a protective coating, preventing premature delamination, blistering, and failure. Poor adhesion can lead to rapid coating breakdown and expose the underlying material to corrosion or damage.

Why is silica sand discouraged or banned as a blast abrasive in many jurisdictions?

Answer: It produces respirable crystalline silica linked to silicosis

Blasting with silica sand generates respirable crystalline silica, a cause of silicosis and lung cancer.

Which SSPC guide covers containment classes for removing lead-containing paint?

Answer: SSPC-Guide 6

SSPC-Guide 6 sets containment system classes for paint removal operations.

Coating the inside of a water tank during a construction project falls under which OSHA confined space standard?

Answer: 29 CFR 1926 Subpart AA

Construction confined space work is covered by 29 CFR 1926 Subpart AA (1926.1200–1213), which took effect in 2015.

What inspection procedure is essential for equipment operation?

Answer: Systematic inspection following established checklists and standards

Systematic inspections using established checklists and industry standards ensure quality and compliance at every stage.

Under the OSHA respiratory protection standard, how often must tight-fitting respirators be fit-tested?

Answer: At least annually

Fit testing is required before first use and at least annually thereafter.

What is the primary purpose of specifying a 'mist coat' or 'seal coat' over a porous concrete substrate before applying the main coating?

Answer: To prevent outgassing bubbles by sealing surface porosity

A mist coat seals the pores of porous substrates like concrete to prevent trapped air from outgassing and creating pinholes or bubbles in subsequent coating layers.

Which factor most significantly increases the corrosion rate of steel in an atmospheric environment?

Answer: Chloride deposition rate

Chloride deposition rate is the dominant factor accelerating atmospheric corrosion because chlorides are highly hygroscopic and form a persistent, conductive electrolyte on the steel surface.

What is the main purpose of applying a stripe coat before the full coat?

Answer: Add extra film build on edges, welds, and corners where spray film tends to be thin

Stripe coating by brush or roller adds film to edges, welds, bolts, and crevices, where film pulls back and goes on thin.

What is the most critical safety requirement in safety procedures?

Answer: Following all applicable safety regulations and wearing required PPE

Safety regulations and proper PPE use are the most critical requirements in safety procedures to prevent injury and ensure compliance.

An inorganic zinc-rich primer is applied too thick. Which defect is most likely?

Answer: Mud cracking

Inorganic zinc silicates are prone to mud cracking when applied above the maximum recommended DFT.

What is the main purpose of a visual inspection in coating quality control?

Answer: Identify surface defects

Visual inspection is the most fundamental and initial step in coating quality control. It allows inspectors to quickly identify visible surface defects such as runs, sags, blistering, cracking, contamination, and inadequate coverage. This early detection helps ensure the coating's aesthetic quality and functional integrity before more advanced testing is performed.

Why is humidity control important during surface preparation for coatings?

Answer: Prevents flash rusting

Humidity control is critical during surface preparation, especially after abrasive blasting of ferrous metals. High humidity can cause flash rusting, where the freshly cleaned metal surface rapidly oxidizes and rusts before the coating can be applied. Controlling humidity prevents this immediate corrosion, ensuring a clean and reactive surface for optimal coating adhesion.

How should hazardous conditions be handled during maintenance protocols work?

Answer: Stop work, secure the area, report the hazard, and follow safety protocols

All hazardous conditions require immediate action: stop work, secure the area, report the hazard, and follow established safety protocols.

What type of respirator is typically required for an operator doing open abrasive blasting?

Answer: NIOSH-approved Type CE abrasive-blast supplied-air respirator

OSHA abrasive blasting rules require blast operators to wear abrasive-blasting respirators, which are NIOSH Type CE supplied-air units.

A specification requires 'ASTM D4285' testing before coating application. What does this test check for?

Answer: Oil and water contamination of compressed air

ASTM D4285 tests for oil and water in compressed air by blasting air onto absorbent paper, ensuring the blast equipment is not contaminating the prepared surface.

How should hazardous conditions be handled during technical measurements work?

Answer: Stop work, secure the area, report the hazard, and follow safety protocols

All hazardous conditions require immediate action: stop work, secure the area, report the hazard, and follow established safety protocols.

What is OSHA's PEL for respirable crystalline silica as an 8-hour TWA?

Answer: 50 µg/m³

OSHA's silica standard sets the PEL at 50 µg/m³ with an action level of 25 µg/m³.