Mar 2017
Gas Distribution
Composite Repairs to Complex Shapes
NIA_NGGD0094
Live
Mar 2017
Dec 2019
National Grid Gas Distribution, National Grid Gas Transmission, Northern Gas Networks, SGN and Wales and West Utilities
Dina Mihsein / Tatiana Prieto-Lopez– National Grid Gas Distribution Nancy Thomson – SGN Lucy Mason– WWU Chris Rodgerson – NGN Robert Bood– NGGT
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Network Innovation Allowance
Others
Gas Distribution Networks
£999,999.00
The work proposed below will be undertaken in three stages;

Stage 1

  • Development of a composite repair design methodology document

  • An analytical/numerical study to identify an optimum fitting size for testing in Stage 2 and Stage 3

  • Testing for possible debonding due to pressure reduction/depressurisation

  • Long term (fatigue) testing of bends

Stage 2

  • Static testing of Tees

  • Long term (fatigue) testing of Tees

  • Stiffness and flexibility studies of repaired Tees

Stage 3

  • Assessment of environmental variables on composite performance

The objectives of the scope of work proposed are;

  • Development of a guidance document detailing the design and installation requirements for the repair of part-wall, blunt, metal loss defects associated with complex geometry components
  • Verification of the suitability of the composite repair system through full scale testing supported by analytical and numerical analysis, as appropriate
  • Assessment of environmental variables on the integrity of the composite repair.
The success criteria for the work proposed will be;

  • Verification and implementation of new technology enabling repairs of part through-wall, blunt, metal loss defects associated with complex shaped geometries at a reduced cost and reduced downtime compared with conventional techniques/methods.

  • A consistent approach to the repair of part through-wall, blunt, metal loss defects for the UK gas transmission and distribution system.

  • Verification of the ISO recommendations and industry practice guidance for the design and installation of composite systems, and development of a comprehensive guidance document governing the design and installation of composite systems.