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simulation · knowledge · profit
21 April, 2021
Inprocess Webinars
Accurate determination of Flare Loads
© by Inprocess 2
Flare Systems Analysis: Project Scope
Is the current equipment size appropriate for plant safe operation?
Relief devices: PSVs and BDVs
Headers and pipes Flare tip and KO Drum
Flare Systems Analysis: Methodology
Flare Network Simulation(Steady State)
Design Constraints
Then, we need: Flare network layout Flare network isometrics Length and diameter of the piping
Then, we need: H&MB at Normal Operation Unit P&ID PSV Load and composition
calculation RO Maximum Load and composition Equipment Datasheets
YES
YES
NO
NO
PSV service / BD RO revalidation project
Data collection
Do we know the composition and load from each PSV during common scenarios or RO during a Simulatenous Blowdown?
Do we have a Flare Network Hydraulic Model?
Is the current equipment size appropriate for plant safe operation?
NOUnit and Flare
Network Simulation(Dynamic Analysis)
CAPEX
Is the current equipment size appropriate for plant safe operation?
NO
YES YES© by Inprocess 3
• Past Experiences –Literature Case Studies
• Guidelines / Recommendations / API521
• Fundamentals / Theoretical basis
4
The question
Is there a possibility to reduce CAPEX by estimating the flare network behaviour in a more accurate way?
How aboutDynamic ProcessSimulation
© by Inprocess
5
Bibliography and studies
Relief load is0.0 t/h
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6
Flare Network Dynamic Analysis during GPF
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The API 521 standard provides general guidelines on estimating relief loads but it leaves the calculation details to the process engineer’s judgment
Most flare are evaluated considering a steady-state case and the calculation of the flare load is made without considering superimposed and non-linear phenomena.
Flare networks designed with conventional methods might be oversized and therefore they could be capable of accommodating new load
7
Flare Load Estimation in Industry: How API works
API 521 01/2007 (Chapter 5.22)*: “Dynamic simulation can be used in pressure-
relief system design to calculate transient pressure increases as indicated in 5.19 or to calculate required relief rates from individual pressure-relief devices. Conventional methods for calculating relief loads are generally conservative and can lead to overly sized relief- and flare system designs.
Dynamic simulation provides an alternative method to better define the relief load and improves the understanding of what happens during relief.”
© by Inprocess
Flare Load Estimation in Industry: Conventional Methods Limitations
The conventional approach does not consider any dynamic phenomena that happens during the
emergency situations
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Flare Systems Analysis: Dynamic Analysis
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Flare Systems Analysis: Dynamic Analysis
System’sthermodynamics
Time-DependentContributors
Geometryand Holdups
Flare Load Estimation in
Industry: Conventional
Methods Limitations
The conventional approach
does not consider any
dynamic phenomena that
happens during the
emergency situations
10
Flare Systems Analysis: Dynamic Analysis
Dynamics of the Relief Valve
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11
Flare Systems Analysis: Dynamic Analysis
Avoidance of Relief Load Double Dipping
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12
Dynamic Analysis / Available Area
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Reduction due to the staggered reliefs
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Flare Systems Analysis: Dynamic Analysis
14
Integrated Model Example
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15
Relief Load Calculation
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Beyond guessworkM.A. Navarro and M.A. Alos1,*
Inprocess Technology and Consulting Group;
To be Published Hydrocarbon Engineering, July 2020
“explores the use of dynamic simulation to find the optimal control parameters for purge gas injection in flares.”
Determination of Dry-Ice Formation during the Depressurization of a CO2 Re-Injection SystemJ.A. Feliu1, M. Manzulli2 and M.A. Alos1,*
1Inprocess Technology and Consulting Group;2Virtual Materials Group Europe;
Book Chapter Cutting-Edge Technology for Carbon Capture, Utilization, and Storage, (135–146) © 2018 Scrivener Publishing LLC
“Several simulation studies have been carried out to determine if in current process conditions the depressurization of the process sections could lead to the formation of dry ice”
Taking care of Flare Header PressureInprocess Technology and Consulting Group;Josep-Anton Feliu, Sergio Linuesa and Miquel A. Alós,“discuss the application of dynamic simulation to analyze potential trips of the HIPPS system at the flare header of a centra l processing facility during
trunkline pigging operations”
Reviewing the SituationMarc Masso and Miquel A. Alos, Inprocess Technology and Consulting Group;Published Hydrocarbon Engineering, October 2016
“Describes the steps that should be taken during a flare network capacity assessment, using both a conventional aaproach or dynamic simulation”
Dynamics Break the BottleneckPrabhat Panigrany1, Jens Balmer1, M.A. Alós2, Michel Brodkorb2 and Brian Marshall3
1IWintershall, Germany;2Inprocess Technology and Consulting Group;3SoftBits Consultants, UK ;
Published Hydrocarbon Engineering, September 2011
“Demosntrate the ways in which a dynamic flare system modelling study allows for Safer Blowdown, using a Winterhsall facility as an example”
Are there alternatives to an expensive overhaul of a bottlenecked flare system? Detlef Gruber 1, Dietmar-Uwe Leipnitz 1, Prasad Sethuraman 2, Miquel Angel Alos 3, Jose Maria Nougues 3 and Michael Brodkorb 3
1BP Lingen Refinery2BP Refining Technology 3Inprocess Technology and Consulting
Published Petroleum Technology Quarterly in Q1 2010“Changes in regulation or the revamp of an existing plant need not require an upgrade to a refinery’s flare system configurat ion. This article gives an overview of the advantages of the Dynamic Simulation approach, guidance on when and where to apply it, and describes a case s tudy of a study at BP’s Lingen refinery in Germany”.
© by Inprocess 16
Related Publications in books and Journals
marc.masso@inprocessgroup.com
+34 933 308 205info@inprocessgroup.com
www.inprocessgroup.com
Thank you!
Any question?
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