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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