Jul 2016
Electricity Transmission
Reuse of Existing Concrete Assets
Jul 2016
Jul 2018
SP Energy Networks and SP Transmission
James Yu (Future Networks Manager)
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Network Innovation Allowance
Asset Management and Electricity Transmission Networks
ScottishPower will work with a supplier(s) to develop a strategy to assess and repair structures as detailed below:

Stage 1: Development of a Methodology

ScottishPower will identify and engage with a suitable experienced consultant who will assist ScottishPower developing a methodology and technical assessment process for the reuse of concrete structures. This will be applied across a number of identified sites to determine suitability.

Stage 2: Design Assessment

ScottishPower will identify various sites that will benefit from this new approach. The design consultant will carry out a desktop assessment of the assets to determine if and what level of repair/strengthening/reuse is required.

Stage 3: Visual and Condition Assessment

A visual and condition assessment of the structure will be undertaken. Testing of the concrete will be required and this shall be undertaken by an approved concrete repair contractor.

Stage 4: Report

A report, considering the findings of the assessment and testing stages, will be compiled to allow ScottishPower to make an informed judgment as to the value of extending the service life of the assets. This report will be of sufficient detail to allow an approved concrete repair contractor to undertake any repair / strengthening / reuse works as required.

It is anticipated that the following objectives will be met:

Stage 1:   Development of a Methodology
It is proposed that this is developed along with the consultant who will then carry out the design assessment. The proposed methodology will aim to produce a document that can be used to assess all future assets. The details of the methodology are as follows:

• Identify the various types and groups of structures that are part of the  ScottishPower network;
• Identify assessment methods;
• Produce a summary of asset attributes and ratings to be assessed;
• Determine scoring system which will produce a condition rating to determine if the asset can be reused;
• Set out Health and Safety assessments that will be used along with the condition assessments.
• Highlight acceptable risks.

Stage 2: Design Assessment
The outline scope will be as detailed below:
• Desktop assessment of the as-built records to determine the original design loadings;
• Consider dynamic loadings and understand design loadings from old and new electrical infrastructure;
• Determine where the weak points in the structures are and what proposed strengthening works could be undertaken to the existing structures;
• Determine a condition assessment/testing strategy that is required to complete the assessment.

Stage 3: Visual and Condition Assessment
It is proposed that a visual and condition assessment will be carried out, with any specialist testing being undertaken by an approved contractor. 
It is expected that a combination of Non Destructive and Intrusive testing will be required and that test samples will be sent to a UKAS accredited laboratory for evaluation.

Stage 4: Report
The final report will collate the data gained from project Stages 2 & 3 providing recommendations such as:

• Identify repair/reuse/strengthening works that need to undertake to increase the service life of the asset(s);
• Repair specification for a contractor to provide an accurate cost and in turn carry out the necessary repair / improvement works;
• Detail of the risk that  ScottishPower will need to accept in order to continue using these existing assets, such as reduced factors of safety etc;
• Cost benefit analysis of repair / reuse / strengthening works including ongoing inspection and maintenance requirements against the cost of replacement.

It is expected that this project will be successful if the following outcomes can be returned:

  • Increases the lifespan of existing structures by 20+ years;
  • Demonstrates notable savings in-line with the service life;
  • Reduced on-site working times and number of outages required.