Orifice Flow for Subcooled Flashing Liquids

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.

Wednesday, November 8, 2017

In a previous Fireside Chat, Orifice Flow Calculation Basis, we provided information on the flow of compressible fluids through sharp-edged orifices.  While that topic was primarily geared toward the flow of gases through an orifice…

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Wednesday, February 15, 2017

Many of the relieving requirements for credible overpressure scenarios we calculate implicitly assume that the only mass/energy allowed to leave the system is through the relief device; however, there are some instances of reasonable attempts…

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Friday, July 1, 2016

The API Standard 2000, 7th Edition thermal inbreathing calculation has conservative assumptions regarding the rainfall rate and fluid properties within the tank that can result in excessive venting requirements for small tanks, such as those…

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Tuesday, January 26, 2016

Following the release of the most recent Fireside Chat on pressure relief critical controls, we received a question specific to critical check valves, or non-return valves (NRVs), and our thoughts on taking credit for them…

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Thursday, January 7, 2016

There are several controls used in a facility in various ways that directly affect the relief system design or design basis, and are critical to the design of a pressure relief system.  While there are…

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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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