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Projects: Projects for Investigator
Reference Number	NIA_SGN0167
Title	Slow Strain Rate Test and Hydrogen Permeation Correlation
Status	Completed
Energy Categories	Hydrogen and Fuel Cells(Hydrogen, Hydrogen transport and distribution) 100%;
Research Types	Applied Research and Development 100%
Science and Technology Fields	ENGINEERING AND TECHNOLOGY (Mechanical, Aeronautical and Manufacturing Engineering) 100%
UKERC Cross Cutting Characterisation	Not Cross-cutting 100%
Principal Investigator	Project Contact No email address given SGN
Award Type	Network Innovation Allowance
Funding Source	Ofgem
Start Date	01 March 2021
End Date	30 September 2021
Duration	ENA months
Total Grant Value	£35,507
Industrial Sectors	Energy
Region	South East
Programme	Network Innovation Allowance
Investigators	Principal Investigator	Project Contact , SGN (100.000%)
	Industrial Collaborator	Project Contact , SGN (0.000%)
Web Site	https://smarter.energynetworks.org/projects/NIA_SGN0167
Objectives	In order to assess the risk of hydrogen embrittlement of GT network carbon steel, a slow strain rate test (SRRT) and a hydrogen permeation correlation study will be undertaken by National Physical Laboratory (NPL). The work will be carried out through two separate activities that include: Work Package 1-Slow Strain Rate Testing The work package will involve testing on a pipe section with characteristics similar to the material of the Granton to Grangemouth pipeline. Slow strain rate tests will be carried out on material specimens in both ambient air and hydrogen environments to identify susceptibility to hydrogen embrittlement. This will allow SGN to make a preliminary assessment of pipe material in the LTS for hydrogen service. Work Package 2-Hydrogen Uptake CorrelationDesktop studies as part of work package two will provide information regarding the relationship between level of cathodic charging and the partial pressure of hydrogen in the pipeline and will enable the levels of cathodic charging to be established for the rest of the test programme. The work will link GD-OES tests being undertaken at Technical Services Provider (University of Strathclyde) as part of the material characterisation. Work Package 1-Slow Strain Rate TestingSlow strain rate tests will be carried out on tensile specimens manufactured from a pipe section supplied by SGN.Tests will be carried out in duplicate on parent material specimens under the following conditions:Air (at ambient temperature)Hydrogen (at 40barg)Susceptibility to hydrogen embrittlement will be assessed by comparing the plastic strain to failure in the two environments.The selection of 40barg for the tests in hydrogen is based on (i) a typical operating pressure in the high-pressure GD network and (ii) the highest pressure at which it is considered that tests can be safely conducted using the NPL SSRT equipment.Work Package 2-Hydrogen Uptake CorrelationA desk-based review of the scientific literature will be conducted to establish the correlation between hydrogen uptake in steel via cathodic charging in aqueous environments and that in the presence of gaseous hydrogen under pressure.The aim of the work is to facilitate comparison of the results of the NPL tests in pressurized hydrogen with any subsequent work at the University of Strathclyde that may employ cathodic charging to introduce the hydrogen into the steel for safety reasons. The main objectives of the work are to determine whether there is a potential risk of hydrogen embrittlement of gas network pipeline steel by comparing SSRT results in are and in 40 bar hydrogen and to establish a correlation between hydrogen uptake in steel by cathodic charging in aqueous environments with that in gaseous hydrogen under pressure.
Abstract	The UK government has committed to reducing greenhouse gas emissions to Net Zero by 2050. All future energy modelling identifies a key role for hydrogen in providing decarbonised energy for heat, transport, industry and power generation. A key element of transition to hydrogen is to deliver compelling evidence for the enduring use of existing gas network assets in the form of a pathway to decarbonisation.The Future of LTS project is one of the most advanced projects relating to above 7bar pipelines. The project is designed to develop the safety, technical and practical evidence to support the use of hydrogen in the LTS. A key aspect of the project involves the assessment of the known negative effect that hydrogen can have on the ductility and toughness of line pipe steel, (termed “H2 embrittlement”), which can lead to cracking of the steel.
Publications	(none)
Final Report	(none)
Added to Database	19/10/22