Pipefitter Safety Procedures and Regulations 4 — Questions and Answers
Question 1: When working in a confined space with potential oxygen deficiency, what minimum oxygen level must be present before entry without supplied air?
- 16%
- 18%
- 19.5% (Correct answer)
- 21%
Correct answer: 19.5%
OSHA requires a minimum atmospheric oxygen concentration of 19.5% before workers may enter a confined space without supplied-air respirators.
Question 2: A pipefitter is cutting into a line that previously carried flammable gas. Which action must be taken FIRST before any hot work begins?
- Notify the supervisor
- Purge and test the line for flammable vapors (Correct answer)
- Don full PPE
- Obtain a general work permit
Correct answer: Purge and test the line for flammable vapors
The line must be purged and tested to confirm it is free of flammable vapors before any ignition source is introduced.
Question 3: Under OSHA's Process Safety Management (PSM) standard, which quantity of a highly hazardous chemical triggers PSM requirements?
- Any detectable amount
- The threshold quantity listed in 29 CFR 1910.119 Appendix A (Correct answer)
- 1,000 lbs regardless of chemical
- The quantity set by the EPA only
Correct answer: The threshold quantity listed in 29 CFR 1910.119 Appendix A
PSM coverage is triggered when a facility holds a highly hazardous chemical at or above the threshold quantity specified in 29 CFR 1910.119 Appendix A.
Question 4: A fall protection system using a personal fall arrest system (PFAS) must limit maximum arresting force on the body to:
- 900 lbs
- 1,800 lbs (Correct answer)
- 1,800 N
- 5,000 lbs
Correct answer: 1,800 lbs
OSHA 29 CFR 1926.502 requires that a PFAS limit maximum arresting force to 1,800 lbs (8 kN) when used with a body harness.
Question 5: Which document provides written authorization to break into an energized or pressurized piping system and details all isolation steps?
- Job Hazard Analysis (JHA)
- Line Break Permit (Correct answer)
- Hot Work Permit
- Confined Space Entry Permit
Correct answer: Line Break Permit
A Line Break Permit (also called a line opening permit) specifically authorizes and controls the procedure for opening pressurized or energized piping systems.
Question 6: When handling hydrofluoric acid (HF) piping systems, which specialized antidote must be immediately available on-site?
- Sodium bicarbonate solution
- Calcium gluconate gel (Correct answer)
- Activated charcoal
- Sterile saline wash only
Correct answer: Calcium gluconate gel
Calcium gluconate gel is the first-aid antidote for HF skin exposure, binding fluoride ions and preventing deep tissue penetration.
Question 7: OSHA's Hazard Communication Standard (HazCom) requires Safety Data Sheets (SDS) to follow which format?
- ANSI Z400.1 16-section format
- GHS-aligned 16-section format per 29 CFR 1910.1200 (Correct answer)
- NFPA 704 diamond format
- A facility-specific format approved by OSHA
Correct answer: GHS-aligned 16-section format per 29 CFR 1910.1200
29 CFR 1910.1200 aligns with the Globally Harmonized System (GHS), mandating a standardized 16-section SDS format.
Pipefitter Safety Procedures and Regulations 4
When working in a confined space with potential oxygen deficiency, what minimum oxygen level must be present before entry without supplied air?