On Friday the DHS Infrastructure Security Compliance
Division (ISCD) published a new frequently asked question (FAQ) on the Chemical
Facility Anti-Terrorism Standards (CFATS) Knowledge Center. The question, FAQ#
1786, addresses the effect of change of state in anhydrous ammonia in a
refrigeration system on the reporting requirements for the CFATS Top Screen.
The response to the question reads:
“The total mass quantity within the
system and the physical state, temperature, and pressure of the ammonia as it
exists in the vessel(s) downstream of the condenser(s) should be reported.”
The ‘mass quantity’ portion of that response refers to the
information that would need to be provided to question ‘Q1.70.010 Total Onsite
Quantity’ on the Top Screen. The remainder of the response addresses the
requirements to answer ‘Q1.70.030 Circle 1 Details’ for the largest quantity
location for anhydrous ammonia.
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