Launchpad, July - August 2008
For a full list of proposed, active and closed projects see here
Safe specification and operation of plastically strained C-Mn steel pipelines for sour service (Phase 2)
Launched: June 2008
Cost per Sponsor: £30,000 pa, two payments
Project Leader: Ruth Hammond
TWI has shown in previous work that if a material has been plastically strained it can suffer sulphide stress corrosion cracking even if the hardness is below the ISO15156/NACE MR0175 limit of 250HV. Building on the previous work,this project aims to develop a small-scale laboratory-based test which can simulate accurately the strains experienced in full-scale pipes during reeling and other high strain installation methods. Such a test would give confidence inthe testing and acceptance criteria required of welded pipeline installed by methods imparting high plastic strain.
Fracture mechanics based weld flaw acceptance criteria For C-Mn steel pipelines in sour service (Phase 2)
Launched: June 2008
Cost per Sponsor: £30,000 pa, two payments
Project Leader: Ruth Hammond
Phase 1 of this project has addressed a number of reasons why engineering critical assessments (ECAs) are over-conservative in sour service. Phase 2 will enhance our understanding of how to relate small and large scale testing. Thiswill allow ECAs to be used with confidence for safe installation of sour service pipelines and flow lines with cost savings associated with unnecessary repairs on laying.
