Rupture Disk Sizing Using Kr

Welcome to Inglenook's blog, Fireside Chats. Our goal for the blog is to address topics that may not be encountered everyday, but do deserve some consideration during efforts to ensure facilities are operating safely.  Many "fireside chats" have led to great ideas, improvements, and opportunities.  We hope these do too.

Monday, July 16, 2018

For overpressure protection systems involving only rupture disks (that is, not a rupture disk in combination with a pressure relief valve), the frictional losses throughout the piping system is typically used as a means for…

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Thursday, January 25, 2018

API Standard 520 Part 1 9th Edition1 Annex B §B.3.1.2 provides an expression in equation B.13 for the isentropic expansion coefficient in terms of thermodynamic state variables, to be evaluated anywhere along the isentropic path,…

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Tuesday, December 26, 2017

A subcooled yet flashing liquid, in which the vapor pressure is less than the relief pressure yet greater than the superimposed backpressure, represents an occasional non-ideal sizing condition, as the flow is neither fully liquid…

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Monday, September 25, 2017

There are a number of methods available for estimating the capacity of a pressure relief valve for a two-phase relief fluid.1,2  One primary distinction among these methods is the means for representing fluid property behavior,…

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Monday, October 10, 2016

ASME Section VIII §UG-127(a)(2)1 indicates that the relieving capacity of a rupture disk used independently (that is, not on the inlet or outlet of a pressure relief valve) can be determined based on one of…

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Wednesday, June 29, 2016

The analysis for the flow of liquids through pressure relief devices in API and ASME standards is currently predicated on the fluid viscosity behavior being Newtonian; API Std 520 Part I, 8th edition (2014), explicitly…

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Tuesday, February 23, 2016

Sudden tube ruptures in shell and tube heat exchangers operating at a high differential pressure in which the low pressure side contains an incompressible fluid and the high pressure side contains gas have been recognized…

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Thursday, November 19, 2015

Inglenook received an e-mail the other day from a long-time client asking what references we used when specifying restriction orifices for several emergency blowdown systems we had designed a few years earlier.  The primary concern…

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Monday, September 21, 2015

One of the more complex situations for control valve failure is associated with the level control on the liquid bottoms of an upstream vessel operating at a pressure significantly higher than the downstream system.  Opening…

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Monday, August 24, 2015

Manufacturers of pressure relief valves are required to publish capacity data for their valves, and quite often this is translated into an effective coefficient of discharge (Kd).  These discharge coefficients are typically published for water…

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