Geotechnical survey for gas and water pipelines
Drilling along gas, water and sewer pipeline routes, soil and water corrosivity testing and detailed ground conditions at road and river crossings.
Licensed service · EL-845/2026
Gas, water and sewer pipelines operate underground for decades, so their reliability depends directly on soil properties. Uneven settlement along the route causes stress in the pipe, while aggressive soil and groundwater accelerate corrosion of steel pipes and deterioration of concrete manholes. A geotechnical survey identifies these risks in advance.
Boreholes are drilled along the centreline and at crossings under roads, canals, rivers and railways. We study soil composition, excavation category, trench wall stability, groundwater level and its seasonal fluctuation. Where horizontal directional drilling (HDD) is planned, the ground structure at the crossing is investigated in particular detail.
Soil and water samples are tested for corrosivity to steel and concrete, salt content and electrical resistivity, which forms the basis for selecting cathodic protection and coating type. In the saline soils of Absheron these values are often high, so we pay special attention to them.
Results are presented as a longitudinal geological profile together with the topographic plan of the route and are used by the designer to choose pipe burial depth and trench solutions.
When you need it
- Design of transmission and distribution gas pipelines
- Construction of water supply and sewer lines
- Design of crossings under roads, rivers and canals
- When horizontal directional drilling (HDD) is planned
- Reconstruction of existing pipelines
What's included
- Drilling of boreholes along the route
- Detailed investigation at crossings
- Groundwater level determination
- Soil excavation category
- Corrosivity to steel and concrete
- Soil electrical resistivity measurement
- Longitudinal geological profile
How we work
- Review of the route scheme and brief
- Selection of borehole and crossing locations
- Field work: drilling, measurements and sampling
- Laboratory and chemical analysis
- Delivery of report and longitudinal profile
Deliverables
- Engineering geological report
- Longitudinal geological profile of the route
- Corrosivity test results
- Recommendations on burial depth and trenching
