| 237110 |
Water well pump and well piping system installation |
| 237120 |
Compressor, metering and pumping station, gas and oil pipeline, construction |
| 237120 |
Construction management, oil and gas pipeline |
| 237120 |
Construction management, oil refinery and petrochemical complex |
| 237120 |
Corrosion protection, underground pipeline and oil storage tank |
| 237120 |
Distribution line, gas and oil, construction |
| 237120 |
Gas main construction |
| 237120 |
Gathering line, gas and oil field, construction |
| 237120 |
Manhole, oil and gas, construction |
| 237120 |
Natural gas pipeline construction |