Which of the following accurately reflects the policy on mechanical grooved couplings?

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Mechanical grooved couplings are permitted on carbon dioxide fire-suppression piping because CO2 systems routinely use steel pipe joined with grooved couplings, and these joints provide a strong, quick-to-install connection that can handle the high pressures typical of CO2 systems. This combination aligns with the design and maintenance expectations for CO2 lines, where accessibility for inspection and replacement is valuable and the fluids involved are non-corrosive to the metal and compatible with the coupling method. Foam concentrate piping, on the other hand, often has different chemical compatibility requirements and may rely on joints that avoid elastomer gaskets or specific materials used in grooved couplings, or demands weld/flanged joints to meet cleanliness and delivery standards. For these reasons, the policy does not extend grooved couplings to all piping types, nor does it restrict CO2-only to a subset of systems; it specifically allows them for carbon dioxide systems.