PhD Thesis in SmOP

European Program on
Evaluation of Safety Valve Stability II

Tests of safety valves under typical industrial operating conditions

Safety valves are tested and approved by type. Tests are done using new valves under laboratory conditions. The opening characteristics of a valve may change significantly when activated under operating conditions compared to lab conditions. The European Program on Evaluation of Safety Valve Stability (EuroValve II) investigates phenomena leading to safety valve instability. Safety valve instability like chattering and fluttering can lead to incidents with serious danger to human health and the environment. Instability are usually caused by the conditions of installation with complex in- and outlet lines. Therefore, the current sizing criterion restricts the pressure drop in the inlet line to a maximum of 3 %. However, recent experimental results in the US with API valves and straight inlet piping as well as at the CSE Institute with European Safety Valves have proven that the current 3 % criterion doesn’t guarantee stable valve functionality.

The objective of EuroValve II is (1) to develop a sophisticated sizing tool to evaluate safety valve stability in current installations and (2) to provide a design guideline for new installations with a focus on European valve designs and (3) to develop and experimentally validate new valve and/or pipe modifications to avoid fluttering and chattering.

The Center of Safety Excellence tests the functionality of safety valves under typical industrial operating conditions. Experiments are done at the CSE-Institutes’s test facility. Various valves are tested including their associated piping upstream and downstream.


PhD-Project in the scope of the following CSE Innovations ProgramSmOP
Project Duration 4 Years

Project Management:
Prof. Dr.-Ing. Jürgen Schmidt

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