Optimization of gas detectors
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1 OIL & GAS Optimization of gas detectors FLUG Bergen Asmund Huser 1 SAFER, SMARTER, GREENER
2 Content DNV GL JIP invitations Gas detector optimization Background Risk based vs geographic approach Optimal number of detectors Summary 2
3 3
4 More JIP Invitations on 4
5 JIP Partner invitation: Phase 2 of Sub-C-O 2 JIP: 5
6 Gas detector optimization 6
7 Background Petrobras required gas detector optimization studies in A. Huser, L.F.Oliveira & J. Dalheim Cost optimization of gas detector systems" Proceedings of OMAE, Vancouver, Paper no. OMAE DNV GL developed GDOZ (Gas Detector Optimization program) Combines results from large number of dispersion cases, each is weighted by its frequency Method refined with optimal location finder, DETLOC 2010 P. Araujo FLUG meeting Houston 2014 Paper by Gabriele 2016 compared with geographic approach G. Ferrara 1, R. Zhvansky 1, T. Bengherbia 1, S. H. Ledin 1, G. Rocha 2, I. Ahmed 1, D. M. Johnson 3, V. Tam 3 Performance Based Gas Detection: Geographic Vs Scenario Based Approaches using CFD Hazards 26, 2016, 7
8 Volumetric vs Source Approach: Potential Weaknesses of the Source Approach Point Detectors 8
9 Scenario Based vs Geographic Approaches: Potential weaknesses of the Geographic Approach The Geographic Approach is based on the regular spacing of detectors based on the minimum size of the gas cloud that can result in a damaging overpressure. Minimum Size of the detectable gas cloud Geographic Approach Actual Probability Distribution of Gas 9
10 Scenario Based Approach 3D CFD for Dispersion Leak Point Idealised Simulation 10
11 Leak Source Definition: Leak Position 3D model is used to realistically define the most likely release points: flanges, valves, rotating machinery, instrument connections, drain points, small bore tubing etc. Nearest neighbour boundary distance Y Z X 11
12 Leak Source Definition: Leak Position 12
13 Scenario Based Approach Modelling of Gas Dispersion 100 PPM 500 PPM Hundreds/thousands of gas dispersion simulations are performed for each process area The accurate 3D CFD modelling will allow considering the main parameters affecting the gas detection effectiveness: Specific/realistic wind flow patterns Specific/realistic behaviour of the released gas (heavy gas) 13
14 Frequency Maps Correct physics of dispersion Realistic points of release Actual frequency of the release 14
15 Frequency Maps: Example for an onshore process module y=-7m y=0m y=20m 15
16 Frequency Maps: Example for an onshore process module y=-7m Y=0m Y=20m 16
17 Frequency Maps: 3D iso-contours for an offshore platform 17
18 Frequency Maps: 3D iso-contours for an FPSO 18
19 DNV GL F&G Mapping Comparison with Geographic Approach 19
20 Location of Detectors comparing geographic and scenario based approach Geographic approach Scenario based approach 20
21 Coverage Plots for Scenario Based and Geographic Approach (I) Scenario Based Geographic Approach 21
22 Coverage Plots for Scenario Based and Geographic Approach (II) Scenario Based Geographic Approach 22
23 Cost (Million USD) Cost benefit assessment A cost benefit is necessary to identify the optimal number of detectors. An economical approach is used applying the following parameters: Platform value and lifetime; Oil production; Cost of detectors (installation and maintenance); Cost of spurious failure 23 detectors Number of detectors 23
24 Gas occurrence probability No detectors Existing detectors layout New detector layout proposed by DNV GL 24
25 Conclusions Performance Based approach is needed instead of Prescriptive (following IEC 61511). Also called, risk-based Scenario-Based, or Volumetric approach. 3D CFD modelling gives most effective locations Source Volume Approach and Geographic Based Approach are less effective Quick geographic methods OK early phases of Projects. Efficiency increase is large: Number of detectors can be reduced by more than a factor two Detection probability can increase more than 50% The cost optimal number of detectors gives minimum cost 25
26 Thank you Asmund Huser SAFER, SMARTER, GREENER 26
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