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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