Soil or ground thermal resistivity (soil thermal conductivity or soil thermal diffusivity) testing is required to determine cable design and or trench design prior to cable placement.
Soil Environment Services Ltd can test the ground prior to or during any site works, within trenches or in the laboratory. We test soils, rocks and cable bedding materials such as Cement Bound Sand and in recent years have worked with some of the biggest cable laying companies on the longest cable routes in the UK. Of critical importance is the accuracy of resistivity measurements both on site and in the essential supporting laboratory assessments. Soil Environment Services Ltd is conducting on-going research in this area to understand the soil physics of the environment in order to deliver highly accurate thermal resistivity measurements. Please see our information sheet.
Our range of equipment is designed to allow full flexibility with in-field testing.
We have experience working in difficult conditions and are able to tailor the equipment to the site.
Thermal probes can be inserted into rock or gravel on site and these very often occur in the same trench.
We will assess the specific needs of the project and the environment within which the cable will be operating to provide specific and accurate measurements.
Testing may be carried out in boreholes, test pits or trenches, or we can take cores out of soil, rocks or roads.
Thermal resistivity, thermal conductivity or thermal diffusivity of soil, rock or other material, e.g. Cement Bound Sand (CBS) can be measured in the laboratory and is essential to both support field measurements and assess thermal properties under a range of conditions. We have our own dedicated laboratory set up for thermal testing of soils, rocks and CBS. We are currently progressing through the preparation of systems and procedures for a UKAS accreditation application.
Normally we test to and using the following specifications:
IEEE 1997 Std 442 ENAT 97-1, Version 2 2016
National Grid TS 3.05.07
BS 1377 – Compaction
All laboratory work is overseen by Dr Robin Davies who has a PhD in soil physics (soil stabilisation) and many decades of high quality research laboratory experience for the former British Coal and central government funding agencies. Several recent years of laboratory work have increasingly been focussed on undertaking thermal testing for aggregate supply and cable installation companies.
All of our laboratory staff have science degrees, have worked on central government funded science projects which included laboratory work and have spent a number of recent years undertaking soil/rock thermal testing.
UKAS accredited laboratory verification of the mechanical test procedures can currently be supplied if needed.
If you need CBS testing in the laboratory or field, please call us to discuss your exact requirements as sample treatment prior to testing is crucial.
Full project consultancy experience
We tailor testing parameters to your specifications in order for you to design cable trenching and bedding on a project specific basis.
All testing and outputs are conducted to the highest industry standard and in line with current international specifications.
Recent project examples
OMEXOM Crossaig Substation – Mull of Kintyre
ABB – Caithness to Moray 120MW, 50km on land cable route https://www.ssepd.co.uk/CaithnessMoray/
National Performance Centre for Sport – Heriot Watt University http://www.hw.ac.uk/news/work-gets-underway-oriam-scotland-s-sports-21858.htm
INSTALCOM – Sheffield roadway dry mix
Ground testing prior to cable placement. United Utilities – National Grid Feckenham Sub Station
CBS testing above the cables. Crossaig Substation – OMEXOM
CBS testing during cable pulling. Crossaig Substation OMEXOM
Bentonite testing within cable ducts. Caithness-Moray HVDC cable.
Racebank Windfarm Landfall – Kings Lynn
Contact Dr Robin Davies to discuss your requirements;
Office – 01661 844827
Mob – 07776474028