What is the control technique called that involves removing potential hazardous substances from a confined space?

The control technique known as isolation involves physically removing or preventing access to potential hazardous substances within a confined space. This method is critical in ensuring that workers are not exposed to dangerous conditions when entering or working within these areas. By isolating a confined space, hazardous materials, energy sources, or other dangers are effectively eliminated or contained, creating a safer environment for personnel.

This technique is foundational to ensuring worker safety during confined space entries, as it helps prevent incidents that may arise due to the presence of toxic substances, flammable materials, or dangerous atmospheres. Other methods may assist in ensuring safety, but isolation directly targets the removal of hazards, making it a proactive approach in risk management.

In contrast, blanking refers to covering or sealing openings to prevent the escape of hazardous substances following their isolation, and locking involves securing equipment or machinery to prevent unintended operation. Ventilation, while essential for maintaining air quality and controlling atmospheric hazards, does not remove the substances themselves but rather dilutes or disperses them.