Process materials (gases and chemicals)
Why must gas piping be designed to minimize dead spaces, the stagnant pockets where gas does not flow?
- ATo make the piping longer
- BBecause trapped gas, moisture and impurities are hard to flush out, becoming contamination sources and slowing gas changeovers
- CTo make the piping colors match
Show answer and explanation
Answer: B. Because trapped gas, moisture and impurities are hard to flush out, becoming contamination sources and slowing gas changeovers
Gas, moisture and impurities accumulate in dead spaces and are hard to replace even with purging. They contaminate process gases and leave previous gases behind when switching, so piping and valves are designed to minimize dead space.
- A. It is not to make the piping longer.
- B. Correct. They become contamination sources and slow changeovers.
- C. It is not a matter of color.