40.10.00 Gas and Vapor Process Piping and Ductwork

40.15.00 Combustion System Gas Piping

40.15.13 Combustion Air Piping 40.15.16 Oxygen Combustion System Gas Piping 40.15.19 Flue-Gas Combustion System Piping 40.15.23 Exothermic-Gas Combustion System Piping 40.15.26 Endothermic-Gas Combustion System Piping 40.15.29 Dissociated-Ammonia-Gas Combustion System Piping

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