API 570 Piping Classes (Onsite vs. Offsite) Flashcards
0
Q
H2, Fuel Gas, Natural Gas
Onsite - Offsite?
A
Class 2
1
Q
Class of piping with C2-4, H2S, HC (hydrocarbons auto refrigerate, or Boiling point < 50 *F
Onsite - Offsite?
A
Class 1
2
Q
Hydrocarbons - slowly vaporize (operate > flash point)
Onsite - Offsite?
A
Class 2 (Onsite) - Class 3 (Offsite)
Class 1(over road or water)
3
Q
Acids & Caustics
Onsite-Offsite?
A
Class 2 (Onsite) - Class 3 (Offsite) Class 1 (over road or water)
4
Q
Hydrocarbons - No significant vaporization, Operate below flashpoint
Onsite - Offsite?
A
Class 3 in both Onsite & Offsite!