Passage:
Prior to performing maintenance on industrial hydrocarbon lines, operators purge the piping with pressurized nitrogen gas rather than atmospheric air. Because hydrocarbons combust only within a specific fuel-to-oxygen ratio, displacing oxygen with chemically inert nitrogen prevents flammable mixtures from forming, even if residual volatile vapors remain inside the conduit. Once the purge is complete, sensors verify that oxygen levels remain below dangerous thresholds before cutting or welding begins.
Statement: Hot maintenance such as welding can proceed safely on purged lines even if volatile hydrocarbon vapors are still present inside the piping.
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Cevap
True
The author explains that fire requires a specific fuel-to-oxygen mixture and that inert nitrogen prevents combustion even if volatile vapors remain. This directly implies that welding is safe despite residual fuel vapors as long as oxygen remains below hazardous thresholds.
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Anahtar Kavram
Deducing unstated physical implications from stated operational relationships in a technical passage.
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