Pipefitter Safety Procedures and Regulations 4

Question 1

When working in a confined space with potential oxygen deficiency, what minimum oxygen level must be present before entry without supplied air?

Accepted Answer

19.5%

Answer

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?

Accepted Answer

Purge and test the line for flammable vapors

Answer

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?

Accepted Answer

The threshold quantity listed in 29 CFR 1910.119 Appendix A

Answer

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:

Accepted Answer

1,800 lbs

Answer

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?

Accepted Answer

Line Break Permit

Answer

A Line Break Permit (also called a line opening permit) specifically authorizes and controls the procedure for opening pressurized or energized piping systems.

Certified Pipefitter Practice Test

Certified Pipefitter Practice Test

Pipefitter Safety Procedures and Regulations 4