This industry comprises establishments primarily engaged in the pipeline transportation of products except crude oil, natural gas, and refined petroleum products. Cross-References. Establishments primarily engaged in-- ? Providing pipeline transportation of crude oil--are classified in Industry 486110, Pipeline Transportation of Crude Oil; ? Providing pipeline transportation of natural gas--are classified in Industry 486210, Pipeline Transportation of Natural Gas; ? Providing pipeline transportation of refined petroleum products--are classified in Industry 486910, Pipeline Transportation of Refined Petroleum Products; and ? Operating water distribution systems--are classified in Industry 221310, Water Supply and Irrigation Systems.