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Inlet pressure drop is an important factor since it is considered that excessive inlet pressure drop will affect pressure relief valve performance, and potentially result in chatter which may damage the valve and piping.

The latest version of API Standard 520 Part II provides a more detailed description of engineering analysis than previous editions and allows a force balance assessment to be conducted for spring-loaded pressure relief valves exceeding 3% inlet pressure drop. This method can predict valve stability during relief flow, and identify whether chatter, flutter, or stable flow is likely to occur.

In this newsletter, Neil Prophet presents a step-by-step overview of force balance assessments for spring-loaded pressure relief valves exceeding 3% inlet pressure drop. A case study demonstrating the effectiveness of conducting a force balance assessment is shared.

Bonus!
This newsletter also includes access to the 23-minute presentation, Speakers Showcase - Consequence Modeling for Threshold Quantities. Here @Neil Prophet and @Jay Lin, P.E. demonstrate how to perform model simulations in Process Safety Office® SuperChems™ to predict the potential impacts of a hazardous material release where the released quantity reaches or exceeds TQ.

Have a great and safe day.

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