CPV code 45231200 designates Construction work for oil and gas pipelines in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
45231200 sits under 45231000 (Construction work for pipelines, communication and power lines) and groups 2 more specific sub-codes. When classifying a tender, choose the narrowest code that still covers the full subject of the contract.