Hydrogen Environment Testing of Girth Welds Phase 2 - Constant Load Testing

Hydrogen Environment Testing of Girth Welds Phase 2 - Constant Load Testing

Status: Live
Reference: NIA_CAD0134
Lead Network: Cadent
Start Date: 01 September 2025
End Date: 01 March 2026
Budget: £217,300
Funding Mechanism: Network Innovation Allowance
Technology: Energy Storage, Energy Storage and Demand Response, Hydrogen
Strategy Theme: Net zero and the energy system transition
Collaborating Networks: Cadent

Abstract

Previous testing carried out under NIA has outstanding gaps that require further testing to close. Completing the additional testing will confirm actual fracture toughness values to be used and the corresponding J value from the crack growth resistance curve. The project outputs are required and will be used to progress design, specification and procurement processes for hydrogen major projects. The results can also be applied for repurposing assessments.

For fracture toughness, the international standard ASTM E1820 Standard Test Method for Measurement of Fracture Toughness rising displacement method was used and crack growth resistance curves produced.

The original intention was for the material testing results to be used in an update Engineering Critical Assessments (ECA). However, there is significant debate across the industry about where on the crack growth resistance curve to obtain the fracture toughness value to be used in ECAs.

This project will determine the correct point on the curve to obtain the fracture toughness value.

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