What is the significance of "3" on the 49 CFR 176.83 segregation table?

The significance of "3" on the 49 CFR 176.83 segregation table indicates that hazardous materials must be separated by a complete hold. This means that shipments of certain incompatible hazardous materials cannot be stored in the same hold or compartment on a vessel, effectively preventing any risk of contamination or dangerous reactions that could occur if the materials were to mix. This measure is crucial for ensuring safety while transporting hazardous materials, as it adheres to regulations designed to minimize the risks associated with their transportation.

The table helps guide ship operators in arranging cargo in a manner that maintains safety standards, reducing the chance of accidents related to hazardous materials. This segregation practice is particularly vital in maritime transport, where conditions may exacerbate the consequences of a spill or accidental mixing of incompatible substances.