CARO Safety Procedures & Regulations 2 — Questions and Answers
Question 1: Under OSHA's Process Safety Management standard (29 CFR 1910.119), at what quantity of anhydrous ammonia does a refrigeration system become covered?
- 1,000 pounds
- 5,000 pounds
- 10,000 pounds (Correct answer)
- 25,000 pounds
Correct answer: 10,000 pounds
OSHA PSM applies to processes containing 10,000 pounds or more of anhydrous ammonia.
Question 2: What is the OSHA permissible exposure limit (PEL) for ammonia as an 8-hour time-weighted average?
- 25 ppm
- 35 ppm
- 50 ppm (Correct answer)
- 300 ppm
Correct answer: 50 ppm
OSHA sets the ammonia PEL at 50 ppm as an 8-hour TWA.
Question 3: What ammonia concentration does NIOSH list as Immediately Dangerous to Life or Health (IDLH)?
- 50 ppm
- 150 ppm
- 300 ppm (Correct answer)
- 1,000 ppm
Correct answer: 300 ppm
NIOSH lists 300 ppm as the IDLH concentration for ammonia.
Question 4: Under PSM, how often must a Process Hazard Analysis (PHA) be updated and revalidated?
- Every year
- Every 3 years
- Every 5 years (Correct answer)
- Every 10 years
Correct answer: Every 5 years
PSM requires PHAs to be updated and revalidated at least every five years.
Question 5: Before an operator works on a compressor motor, which OSHA standard governs isolating its energy sources?
- 29 CFR 1910.146 Confined Spaces
- 29 CFR 1910.147 Control of Hazardous Energy (Correct answer)
- 29 CFR 1910.134 Respiratory Protection
- 29 CFR 1910.1200 Hazard Communication
Correct answer: 29 CFR 1910.147 Control of Hazardous Energy
Lockout/tagout is governed by 29 CFR 1910.147, the control of hazardous energy standard.
Question 6: Ammonia is classified by ASHRAE Standard 34 as which safety group?
- A1
- A2L
- B2L (Correct answer)
- B3
Correct answer: B2L
Ammonia (R-717) is B2L: higher toxicity and lower flammability with a low burning velocity.
Question 7: An emergency eyewash station meeting ANSI Z358.1 must deliver flushing fluid for at least how long?
- 2 minutes
- 5 minutes
- 15 minutes (Correct answer)
- 30 minutes
Correct answer: 15 minutes
ANSI Z358.1 requires eyewash units to provide a continuous flush for at least 15 minutes.
CARO Safety Procedures & Regulations 2
Under OSHA's Process Safety Management standard (29 CFR 1910.119), at what quantity of anhydrous ammonia does a refrigeration system become covered?