| CSI Code | Short Description | Extended Description |
| 15200 | Process Piping |
| 15210 | Process Air and Gas Piping | Air Compressors Compressed Air Piping Gas Equipment Gas Piping Helium Piping Nitrogen Piping Nitrous Oxide Gas Piping Vacuum Pumps Vacuum Piping |
| 15220 | Process Water and Waste Piping | Deionized Water Piping Distilled Water Piping Laboratory Acid Waste and Vent Piping Process Piping Interceptors Reverse Osmosis Water Piping |
| 15230 | Industrial Process Piping | Dry Product Piping Fluid Product Piping |