Martynov, S;
Mahgerefteh, H;
Yu, J;
(2018)
An analysis of the emergency isolation of high-pressure pipelines transporting supercritical fluids.
In:
28th Institution of Chemical Engineers Symposium on Hazards 2018 (HAZARDS 28).
Institution of Chemical Engineers (IChemE)
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Abstract
Emergency Shutdown Valves (ESDV) represent the front line mitigating measure in the event of the accidental failure of long pipelines transporting pressurised hazardous fluids. In order to select the appropriate ESDV type and its strategic positioning along such pipelines, the decompression flow behaviour during the emergency isolation must be fully understood. The present study employs a computational fluid dynamics (CFD) model for evaluating the efficacy of several types of ESDVs, including Automatic Shut-off Valves (ASV), Remotely operated Control Valves (RCV) and non-return Check Valves (CV), installed along a 250 mm i.d. buried supercritical ethylene pipeline at a maximum operating pressure of 90 bar and temperatures between 5 °C and 30 °C, chosen as a case example. Based on the comparison of the amount of inventory escaping prior to complete valve closure, the simulation results show that installing CVs along the pipeline already equipped with ASVs offers no additional benefits, while combining CVs with RCVs enables faster emergency isolation of the pipeline. Additionally, despite the advantage of rapid closure, it is found that check valves can result in pressure surges as high as 32 bar above the nominal pipeline operating pressure, posing the risk of secondary catastrophic failure of a pipeline. Best practice recommendations for the selection of the appropriate ESDV type and spacing, whilst at the same time ensuring the pipeline's mechanical integrity, are discussed.
| Type: | Proceedings paper |
|---|---|
| Title: | An analysis of the emergency isolation of high-pressure pipelines transporting supercritical fluids |
| Event: | Hazards 28 Conference, 15-17 May 2018, Edinburgh, UK |
| ISBN-13: | 9781911446637 |
| Open access status: | An open access version is available from UCL Discovery |
| Publisher version: | https://www.icheme.org/events/conferences/hazards%... |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10059151 |
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