{"id":7482,"date":"2024-08-07T17:49:02","date_gmt":"2024-08-07T21:49:02","guid":{"rendered":"https:\/\/staging.asminternational.org\/fas\/swri-evaluates-reliability-of-pressure-relief-valves-for-liquid-natural-gas-tanks-in-train-derailment-scenarios\/"},"modified":"2024-08-07T21:51:05","modified_gmt":"2024-08-07T21:51:05","slug":"swri-evaluates-reliability-of-pressure-relief-valves-for-liquid-natural-gas-tanks-in-train-derailment-scenarios","status":"publish","type":"post","link":"https:\/\/www.asminternational.org\/fas\/swri-evaluates-reliability-of-pressure-relief-valves-for-liquid-natural-gas-tanks-in-train-derailment-scenarios\/","title":{"rendered":"SwRI evaluates reliability of pressure relief valves for liquid natural gas tanks in train derailment scenarios"},"content":{"rendered":"

Southwest Research Institute (SwRI), San Antonio, Texas, has helped determine the viability of pressure relief valves for liquid natural gas tanks in the event of a train derailment for the Federal Rail Administration (FRA). The report from the FRA shows that a study conducted by SwRI demonstrates that the pressure relief valves work as designed to prevent overpressurization and explosion if a derailment occurs.<\/p>\n

\u201cThe pressure relief valves on tanks that transport liquid natural gas via rail are designed to vent the headspace of the liquid natural gas in the event of a derailment or a fire,\u201d said SwRI\u2019s Matt Gacek, who led the testing. \u201cThe tanks are double-walled and insulated with cryogenic liquid, but there is still a little bit of heat that makes it into the cold liquid natural gas and starts to boil it off. As that pressure builds, the pressure valve vents the fluid in the tank to prevent overpressurization of that railcar.\u201d<\/p>\n

According to the Bureau of Transportation Statistics, trains derail on average more than 1,000 times each year, though they rarely result in fatalities or considerable damage.
\n\u201cSwRI sought to determine if valves would still properly vent fluid after a railcar derails and flips over, causing the tank\u2019s cryogenic liquid to flow through the valves,\u201d Gacek said.<\/p>\n

For safety reasons, SwRI used liquid nitrogen as a substitute for liquid natural gas and simulated the conditions the safety pressure valve would undergo in a train derailment.<\/p>\n

\u201cThe pressure relief valves that we tested are designed to open at about 115 PSI,\u201d Gacek said. \u201cWe pressurized a large liquid nitrogen tank at pressures up to 200 PSI and observed the flow rate through the valves at different levels of overpressure.\u201d<\/p>\n

Sensors measuring pressure, temperature and flow rate were connected to the liquid nitrogen tank’s discharge line. The plumbing connected to the tested pressure relief valve was constructed to resemble relief valve plumbing in a liquid natural gas railcar.<\/p>\n

\u201cWe determined the actual discharge flow rates through the pressure relief valves at various conditions,\u201d Gacek said. \u201cFor example, we had to be certain that these valves would vent fluid at a high enough rate from inside the container if it rolled onto its side to prevent overpressure and then explosion.\u201d<\/p>\n

The second portion of the project involved evaluating the impact of a potential fire from an operating pressure relief device. To accomplish this, SwRI created a pressurized natural gas flame and measured temperatures and heat fluxes at several safe distances.<\/p>\n

\u201cWe discharged the natural gas at a variety of flow rates, ignited it and characterized the environment around the flame,\u201d said Principal Engineer Jason Huczek of SwRI\u2019s Fire Technology Department. \u201cThat allows us to see what kind of exposures that flame produces and how it can impact the objects around it, such as the next tank.\u201d<\/p>\n

The fire testing data will validate computer modeling calculations, allowing future researchers to investigate a variety of accident scenarios. The project was conducted by the FRA-sponsored team, led by prime contractor Friedman Research Corporation, over 13 months between 2022 and 2023.<\/p>\n

 <\/p>\n

Image – In this image, liquid nitrogen is expelled through a pressure relief valve as part of an SwRI-conducted test to determine their viability for liquid natural gas tanks in the event of a train derailment. The Institute contributed to a Federal Rail Administration report that shows that a study conducted by SwRI demonstrated that the pressure relief valves work as designed to prevent overpressurization and explosion if a derailment occurs. Courtesy of: SWRI.<\/em><\/p>\n

 <\/p>\n

For more information:
\nSouthwest Research Institute
\nhttps:\/\/www.swri.org<\/a><\/p>\n

Video: how SwRI evaluates the reliability of pressure relief valves for liquid natural gas tanks
\nhttps:\/\/www.youtube.com\/watch?v=_KRUWxxGgT4<\/a><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

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