40 10 00 Gas and Vapor Process Piping and Ductwork

40 17 00 Welding and Cutting Gases Piping

40 17 13 Acetylene Welding and Cutting Piping 40 17 16 Acetylene-Hydrogen Mix Welding and Cutting Piping 40 17 19 Methylacetylene-Propadiene Welding and Cutting Piping 40 17 23 Oxygen Welding and Cutting Piping 40 17 26 Inert Gas Welding and Cutting Piping

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