Knockout drum with or connected to a stack open to atmosphere.
- NOTE 1 The term blowdown drum is sometimes also used for knockout drums connected to flare or other disposal systems, but it is not used in this context in this standard.
- NOTE 2 The term blowdown is sometimes used in the context of emergency depressuring of a plant or part of a plant, but it is not used in this context in this standard.
Source:API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards