Relief requirements for boiling systems with heat transfer

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, June 24, 2019

For heat input to two phase systems with a phase change, the vaporization of the liquid forms the basis for the required relief rate, ignoring the expansion of the individual phases. For these systems, the…

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Sunday, June 23, 2019

For heat input to two phase systems without a phase change, the expansion of the individual phases causes a displacement of the phase in contact with the relief device, and that displacement is the basis…

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Saturday, June 22, 2019

For heat input to single phase systems, the heat input, heat capacity, and cubic expansion coefficient are used to obtain a required relief rate. The relief requirements discussed below are for heating or cooling of…

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Friday, June 21, 2019

When heat is transferred to a liquid that can vaporize, the phase change is usually the most significant contributor to the overall change in density, and any individual phase expansions are typically ignored. One key…

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Thursday, June 20, 2019

When heat is transferred to or from a single phase fluid, that fluid will expand or contract, and the isobaric cubic expansion coefficient is used to characterize that expansion. Usually this expansion coefficient is taken…

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Wednesday, June 19, 2019

When evaluating the effect of heat input or removal from a closed system, the rate of heat transfer needs to be identified. Common heat transfer techniques, usually assuming a constant value, are employed while recognizing…

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Tuesday, June 18, 2019

The transfer of heat into or out of a constant volume container results in an attempt of the entrapped fluid to change in overall density, leading to pressure increases or decreases. The change in fluid…

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Monday, June 17, 2019

The Second Edition of the CCPS Guidelines for Pressure Relief and Effluent Handling was released recently, and we have finally had a chance to review the contents. Overall, the book has had a significant overhaul…

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Tuesday, June 11, 2019

For overpressure scenarios involving heat input to a multi-component fluid, with subsequent vaporization of that fluid and relief of the vapors generated, a question arises: what is the effective heat of vaporization that should be…

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