33 52 00 Hydrocarbon Transmission and Distribution
33 52 16.23 Medium Density Polyethylene Piping for Natural Gas
33 52 13 Liquid Hydrocarbon Piping 33 52 16 Gas Hydrocarbon Piping 33 52 16.13 Steel Natural Gas Piping 33 52 16.23 Medium Density Polyethylene Piping for Natural Gas 33 52 16.26 High Density Polyethylene Piping for Natural Gas 33 52 19 Hydrocarbon Piping Handling 33 52 19.13 Hydrocarbon Piping Stringing, Storing, and Stacking 33 52 23 Hydrocarbon Piping Welding 33 52 23.13 Liquid Hydrocarbon Piping Welding 33 52 23.16 Gas Hydrocarbon Piping Welding 33 52 26 Hydrocarbon Piping Pigging 33 52 26.13 Hydrocarbon Piping Pig Launchers 33 52 26.16 Hydrocarbon Piping Pig Receivers 33 52 26.23 Pigs for Hydrocarbon Piping