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| Reference Number | NIA2_SGN0055 | |
| Title | Consequence Assessment of Internal Domestic Pipework Depressurisation | |
| 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 April 2024 | |
| End Date | 30 September 2024 | |
| Duration | ENA months | |
| Total Grant Value | £89,100 | |
| Industrial Sectors | Energy | |
| Region | South East | |
| Programme | Network Innovation Allowance | |
| Investigators | Principal Investigator | Project Contact , SGN (100.000%) |
| Industrial Collaborator | Project Contact , Wales and West Utilities (0.000%) Project Contact , Northern Gas Networks (0.000%) Project Contact , Cadent Gas (0.000%) Project Contact , SGN (0.000%) |
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| Web Site | https://smarter.energynetworks.org/projects/NIA2_SGN0055 |
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| Objectives | To investigate this evidence gap an experimental programme has been designed using a pressure monitoring rig. The test work requires testing over extended periods of time as the investigation tries to answer with what raate and to what extent does diffusive mixing of hydrogen and oxygen occur in domestic size pipework.In addition to the test it is aimed to present methods to reinstate gas in the pipework after depressurisation and/or to disable a gas appliance and/or the gas supply after the supply shut off period to avoid any potential risk to the end user.Tasks within this project will be:• Design and build of rig• Undertake test work• suggest potential mitigation techniques for this risk• Report writing. To help assess the depressurisation of domestic pipework and entrainment of oxygen into the pipework after depressurization, the following scop of work has been proposed:1. To establish a baseline and determine the potential pressure drop and rate of this drop in a typical isolated domestic system, an initial test with minimal joints and no unusual fittings will be carried out (no oxygen sensors included). This will determine the status quo and any repeat tests can be compared to these initial results.2. Following the pressure only test, oxygen sensors will be added to the pipework and a comparison of the pressure drop with the additional joints will be made. This allows for any artificial effect of the sensors (expected to be minimal) to be identified and investigated.3. A series of tests will then be carried out (in agreement with SGN) to investigate the phenomena of depressurisation and oxygen ingression under different scenarios.the following test programme is suggested, which will be discussed at regular intervals with SGN to ensure it still meets all requirements:• Test 1 Establishing the baseline. Extended pressure measurement with no oxygen sensors (to simulate a domestic pipework as would be found in a property) for a repurposed and a new Press-fit system.• Test 2 Extended pressure measurement with oxygen sensors for a repurposed and a new Press-fit system.• Test 3 (optional dependent on findings in test 2) Extended pressure measurement with oxygen sensors for a repurposed and a new Press-fit system, artificially reducing the pressure in the pipework to atmospheric and allowing oxygen ingress (through natural means) for the duration of the test period.• Test 4 Extended pressure measurement with a small (but known) defect/hole included in the system, using a repurposed and/or a new Press-fit system (tbc based on results of test 2).Time for one additional test has also been incorporated, which will allow for further test work of discovered concerns and/or requests from SGN based on findings of performed tests.Alonside the proposed test work it is aimed to present potential mitigations for this health and safety consideration and suitable methods to reinstate gas in the pipework after depressurisation and/or to disable a gas appliance and/or the gas supply after the supply shut off period. It is important to note that oxygen ingression into the pipework could lead to a flamable gas in the installation hence one main risk when relighting the appliance with an air/hydrogen mix could be potential of light back from the appliance. Hence, offering solution to prevent this risk is also another importanct aspect covered as part of this scope of work. This project aims to assess the depressurisation of domestic pipework and entrainment of oxygen into the pipework after depressurization. By undertaking the experimental work we aim to understand this depressurisation rate during the process, and at what stage and up to what extent the oxygen ingression may occur in the pipe.The project will also present potential mitigations and methods /procedures to reinstate gas in the pipework after such depressurisation. It also investigates whether and how to disable a gas appliance and/or the gas supply after the supply has been shut off. | |
| Abstract | This project aims to assess the depressurisation of domestic pipework and entrainment of oxygen into the pipework after depressurization. By undertaking the experimental work we aim to understand this depressurisation rate during the process, and at what stage and up to what extent the oxygen ingression may occur in the pipe.In addition to the test work, the project will present potential mitigations to prevent health and safety risks to the end user and safe methods/procedures to reinstate gas in the pipework after such depressurisation. It also investigates whether and how to disable a gas appliance and/or the gas supply after the supply has been shut off. | |
| 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 | |
