(105c) Modeling and Computation of Reaction Forces on Relief Piping during Depressurization
AIChE Spring Meeting and Global Congress on Process Safety
2015
2015 AIChE Spring Meeting and 11th Global Congress on Process Safety
Global Congress on Process Safety
Development of Engineering Analysis Methods and Tools for Pressure Relief Valve Stability and Relief Pipe Reaction Forces
Tuesday, April 28, 2015 - 11:15am to 11:45am
Modeling
and Computation of Reaction Forces on Relief Piping During Depressurization Jens
Conzen Manager,
Structural Services & Vibration e-mail
address: conzen@fauske.com & Gabe
Wood Senior
Chemical Engineer e-mail
address: wood@fauske.com Fauske & Associates, LLC, 16W070 83rd Street,
Burr Ridge, Illinois 60527, USA ABSTRACT The
sudden opening of a relief device, during an overpressure event, will cause the
relief piping to experience dynamic loads. A pressure wave may be generated
that travels at the speed of sound through the fluid. This has lead to force
imbalances, particularly on long pipe segments, that can potentially damage the
relief system, or prevent the relief system from operating properly. In order
to design and properly protect the relief piping with the necessary supports,
it is critical that a detailed analysis of the dynamic loads (e.g. thrust,
momentum and wave), following the opening of a pressure relief device, is
performed. In many cases, simple analytical techniques may not be appropriate,
and a time history analysis of the loads acting on the relief system may be
required. To address this phenomenon, an evaluation of the dynamic loads using
RELAP5 (Reactor Excursion and Leak Analysis Program) software will be
discussed. The RELAP5 software can be used to analyze fluid transients and
compute resulting loads. It is possible to evaluate systems undergoing single
phase or two phase relief.
and Computation of Reaction Forces on Relief Piping During Depressurization Jens
Conzen Manager,
Structural Services & Vibration e-mail
address: conzen@fauske.com & Gabe
Wood Senior
Chemical Engineer e-mail
address: wood@fauske.com Fauske & Associates, LLC, 16W070 83rd Street,
Burr Ridge, Illinois 60527, USA ABSTRACT The
sudden opening of a relief device, during an overpressure event, will cause the
relief piping to experience dynamic loads. A pressure wave may be generated
that travels at the speed of sound through the fluid. This has lead to force
imbalances, particularly on long pipe segments, that can potentially damage the
relief system, or prevent the relief system from operating properly. In order
to design and properly protect the relief piping with the necessary supports,
it is critical that a detailed analysis of the dynamic loads (e.g. thrust,
momentum and wave), following the opening of a pressure relief device, is
performed. In many cases, simple analytical techniques may not be appropriate,
and a time history analysis of the loads acting on the relief system may be
required. To address this phenomenon, an evaluation of the dynamic loads using
RELAP5 (Reactor Excursion and Leak Analysis Program) software will be
discussed. The RELAP5 software can be used to analyze fluid transients and
compute resulting loads. It is possible to evaluate systems undergoing single
phase or two phase relief.
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