Projects
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| Reference Number | NIA2_SGN0065 | |
| Title | NDT Fatigue crack growth rate of hydrogen pipelines | |
| Status | Completed | |
| Energy Categories | Fossil Fuels: Oil Gas and Coal (Oil and Gas, Refining, transport and storage of oil and gas) 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 |
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| Award Type | Network Innovation Allowance | |
| Funding Source | Ofgem | |
| Start Date | 01 June 2024 | |
| End Date | 31 October 2024 | |
| Duration | ENA months | |
| Total Grant Value | £94,295 | |
| Industrial Sectors | Energy | |
| Region | South East | |
| Programme | Network Innovation Allowance | |
| Investigators | Principal Investigator | Project Contact , SGN (99.999%) |
| Other Investigator | Project Contact , SGN - Southern England (0.001%) |
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| Industrial Collaborator | Project Contact , SGN (0.000%) |
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| Web Site | https://smarter.energynetworks.org/projects/NIA2_SGN0065 |
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| Objectives | The LTS Futures project is performing full-scale fatigue testing of pipeline defects including a smooth dent, external crack, external blunt defect, external dent and gouge and internal crack. Fatigue vessels have been fabricated using vintage pipe sections taken from SGNs existing LTS network. One vessel will be tested hydrostatically and the other pneumatically with hydrogen to provide a reference and determine any difference when using hydrogen. The number of cycles to failure will be measured for each pipeline defect and compared with values from the counterpart hydrostatic test vessel. The fatigue crack growth rate of the external crack defect will be measured in-situ using a clip gauge. Strain gauges will also been positioned around defects allowing the stress concentration to be measured.It is proposed using Non-Destructive Testing (NDT) to measure the fatigue crack growth rates on these vessels. Time of Flight Diffraction (ToFD) is one of the most reliable NDT methods for inspecting welds and defects. This is an ultrasonic method that is used in several industries including petrochemical, chemical, oil and gas, power generation and fabrication.A pair of ultrasonic probes are placed on opposite sides of the weld or tested area (e.g. a defect). One of the probes acts as a transmitter and sends out an ultrasonic pulse that is picked up by the other probe which is the receiver. With an undamaged item, the signals picked up by the receiver probe are from two waves one wave that travels along the surface (lateral wave) and one that reflects off the far wall (back wall reflection). If there is a flaw, such as crack, there is a diffraction of the ultrasound pulse from the tips of the crack. By measuring the time of flight of the pulse, the depth of the crack can be calculated using trigonometry. The technique has several advantages including recordable data generation, immediate results, and no requirement for shutdown. It provides one of the most accurate sizing of defect techniques on the market. The testing will take place at the DNV site at Spadeadam, using the pipe material already in use as part of the LTS Futures WP2 pneumatic fatigue rig. Applus RTD is expected to supply and install the following:- 6 x Transducer ToFD 65 Degress -15MHz/3mm- 6 x RG174 Cable with connertors (75mm)- 6 x Mounting Brakets- 1 x ToFd System which will be rented.Installation is expected to have a duration of two days and some post installation support will be required. DNV is expected to supply and install the following:-The safety power and control system to isolate ToFD in the presence of hydrogen gas- Site support and welfare for Applus RTD- Data downloads and handling. Data will be reviewed and analysed under the LTS Futures and outputs publish The objective is to investigate full-scale fatigue crack growth rate of an internal pipeline defect in gaseous hydrogen using NDT. This will support development of the LTS Futures blueprint methodology. The project will provide critical insight, allowing gas network operators to design hydrogen pipelines with the appropriate safety margins. | |
| Abstract | This project proposes the use of a Non-Destructive Testing (NDT) tool on LTS Futures pneumatic fatigue test vessels to assess fatigue crack growth rates of internal pipeline defects. Internal crack fatigue crack growth rate for lower alloy steels in a hydrogen environment has been studied, but there is limited data from full scale tests. The LTS Futures project is performing full-scale fatigue testing of pipeline defects on fatigue vessels that have been fabricated using vintage pipeline material taken from the existing SGN LTS network, thus providing additional learning to their offsite testing program. | |
| Data | No related datasets |
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| Projects | No related projects |
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| Publications | No related publications |
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| Added to Database | 02/10/24 | |
