Modeling transient stresses in spherical vessels during blowdown under fire attack

Falope, G. B. O.; Mahgerefteh, H

doi:10.1002/aic.690490522

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…Based on experimental observations ‰9; 12; 30Š, heat transfer in the vapour phase during blowdown is in the form of both natural and forced convection. The equations used for predicting the heat transfer coef cients for cylindrical and spherical vessels are as given in Mahgerefteh et al [1] and Falope and Mahgerefteh [31] respectively. Radiativeheat transfer due to the relatively high wall temperatures (>300¯C) experienced in the hot spot is accounted for by using standard correlations [32].…”

Section: Wall/ Uid Heat Transfermentioning

confidence: 99%

Modelling ductile failure propagation during blowdown under localized jet fire attack

Falope

Mahgerefteh

2003

Proceedings of the Institution of Mechanical Engineers, Part E:

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A rigorous mathematical model for determining the failure mode of pressurized vessels exposed to localized jet-re impingement during rapid depressurization or blowdown is presented. Accounting for the thermodynamic trajectory of the two-phase hydrocarbon inventory, the method of separation of variables for non-homogenous heat conduction is used to determine the transient radial temperature gradient across the heated section of the vessel wall. The resulting temperature pro le in conjunction with the appropriate vessel geometry stress equations are then used to simulate the transient triaxial thermal and pressure stress yield propagation. Failure is assumed to occur when any of the total stresses exceed the ultimate tensile strength of the vessel wall material. The application of the model to a real cylindrical vessel under localized jet re attack in the vapour space reveals catastrophic failure involving rapid propagation of a tear along the major axis of the vessel wall due to severe thermal stress loading.

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Section: Wall/ Uid Heat Transfermentioning

confidence: 99%

Modelling ductile failure propagation during blowdown under localized jet fire attack

Falope

Mahgerefteh

2003

Proceedings of the Institution of Mechanical Engineers, Part E:

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Modeling blowdown of pipelines under fire attack

Mahgerefteh

Abbasi

2007

AIChE Journal

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in Wiley InterScience (www.interscience.wiley.com).The development of a mathematical model for simulating the blowdown of pressurized hydrocarbon conveying pipelines under fire attack is described. The model is based on the resolution of the conservation equations using the method of characteristics. It accounts for real fluid behavior, pipeline mechanical strength, as well as phase and flow dependent transient heat transfer effects, and frictional pressure losses. Failure is assumed to occur when any one of the simulated triaxial thermal and pressure stresses in the pipeline wall exceed its ultimate tensile strength. The application of the model to a hypothetical example involving localized fire attack on an isolated natural gas pipeline reveals that the pipeline fails because of large thermal stresses on the outer surface in addition to the internal pressure stresses. The efficacy of emergency depressurization using different diameter relief valves as a means of protecting the pipeline mechanical integrity during fire attack is also quantitatively investigated.

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Modeling transient stresses in spherical vessels during blowdown under fire attack

Cited by 2 publications

References 17 publications

Modelling ductile failure propagation during blowdown under localized jet fire attack

Modelling ductile failure propagation during blowdown under localized jet fire attack

Modeling blowdown of pipelines under fire attack

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