Trunk Main Sampling
- Under pressure internal deposition sampling from water mains ranging from 3" – 72"
- Internal vertical camera inspection
- Develops prioritisation & target investment programme for forthcoming AMP's
- Accepted by regulator as method of justifying investment need and demonstrable post cleaning evidence
- Quantitive analysis of deposition
- Utilising existing field equipment – Numerous samples achievable per day – cost efficient
- Cost efficiency to allow regular monitoring of regeneration or reseeding levels within Trunk Mains
Time |
Ref No. |
Site |
Comments - Sample |
Comments - Video |
Colour code |
Depth (mm) |
Pre |
123 |
Trunk Main* Location X |
Fine black deposits and some swarf |
Lots of bits in the water. Dark stained cement lined surface. Faint sampler mark. |
9 |
4 |
Post |
123 |
Trunk Main * Location X |
Completely clean water |
Stripy black staining on a smooth clean grey concrete lining |
0 |
<0.1 |
Pre |
789 |
Trunk Main * Location Z |
Fine black deposits and some swarf. Black/dark brown water |
No flow. Sampler mark and swarf. Dark surface covered with a dark deposit layer. Concrete lined. |
9 |
6 |
Post |
789 |
Trunk Main * Location Z |
Clean water. Two black flakes |
Clean concrete lined main with slight black staining. No sampler mark. Looks cleaned |
0 |
<0.1 |
* Colour grade ranges from 0 (clear) to 9 (severely discoloured) |
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Table 1 - Example of Pre & Post Cleaning Trunk Main Sampling on Large Diameter Trunk Main
Client Comments
The TM sampler has been the most critical tool for developing our long term maintenance plans for the last two AMP periods on our Large Diameter Trunk Mains and Aqueducts (LDTMs); it has allowed us to drive out customer service benefits at lowest whole life costs. We continue to deploy the TM Sampler through Richard as part of our major capital schemes across the supply region of UU with high levels of confidence in the results.
Nick Preston, Civil Engineering Manager at United Utilities