Safety Procedures & Regulations Flashcards

Within what time frame must a PSM incident investigation begin after an incident that resulted, or could have resulted, in a catastrophic release?

Answer: Within 48 hours

PSM requires an incident investigation to begin no later than 48 hours after the incident.

What is the CERCLA/EPCRA reportable quantity for an anhydrous ammonia release within 24 hours?

Answer: 100 pounds

A release of 100 pounds or more of ammonia in 24 hours must be reported to the National Response Center and to state and local authorities.

Ammonia vapor is flammable in air within roughly what concentration range?

Answer: 15% to 28%

Ammonia has a flammable range of about 15% to 28% by volume in air.

Why is closing valves on both ends of a liquid-full ammonia line segment dangerous?

Answer: Liquid expansion from warming can generate pressures high enough to rupture the pipe

Trapped liquid expands as it warms (hydrostatic lockup) and can build enough pressure to burst piping or valves.

When draining oil from an ammonia vessel, which practice is safest?

Answer: Use a self-closing (spring-loaded) drain valve with a second isolation valve, and never leave it unattended

A spring-loaded valve shuts if released, and constant attendance keeps an ammonia release from going unnoticed.

Under PSM, how often must the employer certify compliance through an audit?

Answer: Every 3 years

PSM requires compliance audits at least every three years.

Which EPA regulation requires facilities with more than 10,000 lb of ammonia to prepare a Risk Management Plan?

Answer: 40 CFR Part 68

EPA's Risk Management Program is codified at 40 CFR Part 68.