During tank cleaning, monitoring the tank atmosphere is necessary.

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Monitoring the tank atmosphere is essential during tank cleaning because tanks are confined spaces with the potential for hazardous atmospheres. Cleaning can release or generate vapors, and lingering residues or introduced vapors can create sudden changes in oxygen levels or in toxic and flammable gas concentrations. Without monitoring, you could encounter an oxygen-deficient environment, toxic vapors, or flammable atmospheres, leading to asphyxiation, poisoning, or fire/explosion hazards. Using calibrated gas detectors to check oxygen, toxic, and flammable gases before entry and continuously during work helps ensure the atmosphere is safe, and ventilation or purging can be used to bring conditions to acceptable levels. Relying on smell or appearance is unsafe because many hazardous atmospheres are odorless and invisible. This is why monitoring during tank cleaning is necessary.