Chapter 8 Hand and Power Tool Cleaning Flashcards
- What functions can hand tools perform in the surface preparation process?
A. Removing loosely adherent material
B. Removing tightly adherent material
C. Removing staining
D. Creating a surface profile
A. Removing loosely adherent material
C. Removing staining
Hand tools, such as scrapers, wire brushes, and chipping hammers, are typically used for removing loosely adherent material like rust, mill scale, and old coatings, as well as for cleaning stains. However, they are generally not effective for removing tightly adherent material or creating a significant surface profile, which requires power tools or abrasive blasting.
Which of the following tools can create a surface profile?
A. Chipping hammer
B. Bristle Blaster
C. Chisel
D. Power wire wheel
B. Bristle Blaster
A Bristle Blaster is specifically designed to remove coatings, rust, and corrosion while also creating a surface profile similar to abrasive blasting.
Explanation of other options:
A. Chipping hammer – Primarily used for removing loose material but does not effectively create a uniform surface profile.
C. Chisel – Used for breaking off material but does not create a controlled surface profile.
D. Power wire wheel – Removes contaminants but typically does not create a measurable surface profile suitable for coatings.
Which power tool cleaning standard requires a ≥ 25 μm / 1.0 mil surface profile?
A. SSPC-SP 3
B. SSPC-SP 2
C. SSPC-SP 15
D. SSPC-VIS 3
C. SSPC-SP 15 (Commercial Grade Power Tool Cleaning)
Explanation:
SSPC-SP 15 requires the removal of all visible oil, grease, dirt, rust, coatings, and other contaminants, leaving a surface profile of ≥ 25 μm (1.0 mil). This standard is typically used when abrasive blasting is not feasible but a sufficient anchor profile is needed for coating adhesion.
SSPC-SP 3 (Power Tool Cleaning) removes loose contaminants but does not require a specific surface profile.
SSPC-SP 2 (Hand Tool Cleaning) also does not require a surface profile and is less effective than power tools.
SSPC-VIS 3 is not a cleaning standard but rather a visual guide used for evaluating power tool-cleaned surfaces.
Which standard outlines the requirements for power tool cleaning to bare metal?
A. SSPC-SP 3
B. SSPC-SP 11
C. SSPC-SP 2
D. ISO St 2
B. SSPC-SP 11 (Power Tool Cleaning to Bare Metal)
Explanation:
SSPC-SP 11 requires removal of all visible rust, coatings, and contaminants down to bare metal, while also creating a surface profile suitable for coating adhesion (typically ≥ 25 μm / 1.0 mil). It is used when abrasive blasting is not feasible but a high level of surface preparation is required.
SSPC-SP 3 (Power Tool Cleaning) removes loose material but does not require achieving bare metal or a surface profile.
SSPC-SP 2 (Hand Tool Cleaning) is a lower standard, only removing loose contaminants without achieving bare metal.
ISO St 2 is an ISO standard for hand tool cleaning, which allows for some tightly adherent rust and coatings to remain. It does not require bare metal.
- How large is a unit area when inspecting for staining?
A. 9 in.2 or 58 cm2
B. 3 in.2 or 7.6 cm2
C. 6 in.2 or 20 cm2
D. 12 in.2 or 77.4 cm2
A. 9 in² or 58 cm²
Explanation:
When inspecting for staining in surface preparation, a unit area is defined as 9 square inches (58 cm²). This is the standard area used to assess the extent of staining per industry standards such as SSPC and NACE guidelines.
