Free STSC Confined Space Entry Procedures Questions and Answers 1 — Questions and Answers
Question 1: What is the primary responsibility of the attendant (hole watch) during a permit-required confined space entry?
- To enter the space and assist with the work
- To perform air monitoring inside the space
- To remain outside the space and summon rescue if necessary (Correct answer)
- To sign and authorize the entry permit
Correct answer: To remain outside the space and summon rescue if necessary
According to OSHA 1926.1209, the attendant's primary duties are to know the hazards, maintain an accurate count of entrants, remain outside the space, monitor conditions, and summon rescue services if needed. The attendant must never enter the space to perform a rescue, as this often results in multiple fatalities.
Question 2: A confined space is classified as 'permit-required' if it has a recognized hazard such as:
- Poor lighting
- The potential for a hazardous atmosphere (Correct answer)
- It is below ground level
- It requires a ladder for entry
Correct answer: The potential for a hazardous atmosphere
OSHA 1926.1202 defines a permit-required confined space as one that contains or has the potential to contain a hazardous atmosphere; contains material with the potential for engulfment; has an internal configuration that could trap an entrant; or contains any other recognized serious safety or health hazard. Limited means of entry/exit alone defines a confined space, but the presence of a hazard makes it permit-required.
Question 3: When testing the atmosphere of a confined space before entry, what is the correct sequence for testing?
- Toxics, Flammables, Oxygen
- Flammables, Oxygen, Toxics
- Oxygen, Flammables, Toxics (Correct answer)
- The order does not matter as long as all are tested
Correct answer: Oxygen, Flammables, Toxics
OSHA requires a specific testing order because the presence of one gas can affect the reading of another. The correct sequence is: 1) Oxygen content, 2) Flammable gases and vapors, and 3) Potential toxic air contaminants. An oxygen-deficient or enriched atmosphere can affect the accuracy of combustible gas meters.
Question 4: What is the acceptable range for oxygen levels within a confined space for entry without supplied air?
- 18.0% to 25.0%
- 19.5% to 23.5% (Correct answer)
- 20.9% to 22.0%
- 16.5% to 21.0%
Correct answer: 19.5% to 23.5%
OSHA defines an oxygen-deficient atmosphere as one with less than 19.5% oxygen and an oxygen-enriched atmosphere (which poses a fire hazard) as one with more than 23.5% oxygen. Therefore, the acceptable range for entry is between 19.5% and 23.5%.
Question 5: What is the primary purpose of a confined space entry permit?
- To track the number of hours worked in the space
- To serve as a legal document in case of an incident
- To notify OSHA of the planned entry
- To verify that pre-entry precautions have been completed (Correct answer)
Correct answer: To verify that pre-entry precautions have been completed
The entry permit, as required by OSHA 1926.1206, serves as a safety checklist and a formal authorization document. Its purpose is to ensure that all hazards have been identified, evaluated, and controlled through measures like isolation, ventilation, and atmospheric testing before any worker enters the space.
Question 6: According to OSHA, what is the preferred method for rescuing an entrant from a confined space?
- The attendant entering with a supplied-air respirator
- Calling the local fire department immediately
- Non-entry rescue using a retrieval system (Correct answer)
- Ventilating the space and waiting for the entrant to recover
Correct answer: Non-entry rescue using a retrieval system
OSHA 1926.1211 states that non-entry rescue is the preferred method. This involves using retrieval systems like harnesses and lifelines to pull an incapacitated worker out of the space without anyone else having to enter. Entry rescue should only be performed by a properly trained and equipped rescue team when non-entry rescue is not feasible.
Free STSC Confined Space Entry Procedures Questions and Answers 1
What is the primary responsibility of the attendant (hole watch) during a permit-required confined space entry?