Jun 2017
Gas Distribution
Bonded Saddle for Temporary Mains Access
Jun 2017
Feb 2019
Satwant Sarkaria (Project Manager) & Andrew Newton (Portfolio Manager)
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Network Innovation Allowance
GD - Reliability and maintenance
Gas Distribution Networks
  • Performance criteria required for qualification of the ‘bonded saddle’.

  • Laboratory testing and assessment in accordance with performance criteria.

  • A G23 field trial procedure.

  • Field trial witness / evaluation and report.

  • Develop Manufacturers Specification

Define product performance criteria – to include:

  • Enable access into the gas network with reduced excavation
  • Use typical tooling available to technician where possible. (i.e. effort made to avoid specialist tools)
  • The bonded saddle must have connection interface for a service valve to enable drill attachment
  • Saddle size must be sufficient for attaching around existing fittings for removal
  • Safely enable operatives to install a range of fittings
  • Enable operative to launch devices such as cameras into the main
  • Consideration to the use within the Core and Vac technique
  • All operations will be performed under ‘no gas’ condition

Laboratory testing and assessment

Testing will include:

  • Tensile test
  • Combined Tensile and Torsion test
  • Cleavage/Peel test

Following completion of the laboratory tests, a report will be written providing the results, assessments, and recommendations. The G23 field trial procedure will be developed following successful product qualification in the laboratory.

G23 Field Trial Procedure

Consideration will be given to:

  • Excavation size required
  • Materials and components
  • Surface Preparation
  • Bond application and cure times
  • Saddle, Valve, and drill assembly / disassembly
  • Drilling and tapping
  • Fitting removal
  • Fitting insertion
  • Quality Assurance

Field Trial Evaluation and report

It is proposed that ROSEN will attend three field trials which will include steel pipe and cast iron pipe, at least one of which will be part of the valve remediation programme. ROSEN will provide independent witnessing for operational assurance of the bonded saddle technology. The practical application of the G23 procedure will be witnessed, and each process evaluated and feedback provided to Cadent Gas Ltd.

Develop Manufacturers Specification

It is proposed that ROSEN will develop a manufacturers specification including type testing and batch release testing requirements.

Development of the bonded saddle to which will ultimately lead to:

  • Successful product qualification of the product in the laboratory

  • Successful product qualification of the product in the field