33.52.00 Hydrocarbon Transmission and Distribution
33.52.13 Liquid Hydrocarbon Piping
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