CARO Ammonia Refrigeration Safety 2

Question 1

What is the OSHA permissible exposure limit (PEL) for ammonia as an 8-hour time-weighted average?

Accepted Answer

50 ppm

Answer

OSHA 29 CFR 1910.1000 sets the ammonia PEL at 50 ppm as an 8-hour TWA.

Question 2

At what concentration does NIOSH consider ammonia Immediately Dangerous to Life or Health (IDLH)?

Accepted Answer

300 ppm

Answer

NIOSH lists the ammonia IDLH at 300 ppm.

Question 3

Because ammonia vapor is lighter than air, where should a technician expect a vapor cloud from a warm-gas leak to move first?

Accepted Answer

It rises toward the ceiling

Answer

Ammonia's molecular weight of about 17 makes dry vapor lighter than air, so it rises.

Question 4

A worker gets liquid ammonia splashed in their eyes. What is the correct first-aid action?

Accepted Answer

Flush with clean water for at least 15 minutes

Answer

Immediate, prolonged flushing with water for at least 15 minutes is the accepted first aid for ammonia eye exposure.

Question 5

Under OSHA's Process Safety Management standard (1910.119), what quantity of anhydrous ammonia triggers PSM coverage?

Accepted Answer

10,000 lb

Answer

Facilities with more than 10,000 lb of anhydrous ammonia in a process are covered by PSM.

CARO - Certified Assistant Refrigeration Operator Practice Test