Reliability - Redundancy Allocation in Process Graphs
Process graphs (P-graphs) have been proven to be useful in identifying optimal structures of process systems and business processes. The provision of redundant critical units can significantly reduce operational risk. Redundant units and subsystems can be modelled in P-graphs by adding nodes that re...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIDIC Servizi S.r.l.
2018-08-01
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| Series: | Chemical Engineering Transactions |
| Online Access: | https://www.cetjournal.it/index.php/cet/article/view/596 |
| _version_ | 1818878289838604288 |
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| author | Zoltan Sule Janos Baumgartner Janos Abonyi |
| author_facet | Zoltan Sule Janos Baumgartner Janos Abonyi |
| author_sort | Zoltan Sule |
| collection | DOAJ |
| description | Process graphs (P-graphs) have been proven to be useful in identifying optimal structures of process systems and business processes. The provision of redundant critical units can significantly reduce operational risk. Redundant units and subsystems can be modelled in P-graphs by adding nodes that represent logical conditions of the operation of the units. It is revealed in this paper that P-graphs extended by logical condition units can be transformed into reliability block diagrams and based on the cut sets and path sets of the graph a polynomial risk model can be extracted. Since the exponents of the polynomial represent the number of redundant units, the cost function of the reliability – redundancy allocation problem as a nonlinear integer programming model can be formalised, where the cost function handles the costs associated with consequences of equipment failure and repair times. The applicability of this approach is illustrated in a case study related to the asset-intensive chemical, oil, gas and energy sector. The results show that the proposed algorithm is useful for risk-based priority resource allocation in a reforming reaction system. |
| first_indexed | 2024-12-19T14:11:49Z |
| format | Article |
| id | doaj.art-c54ba36f4df94a268978efbd63a93588 |
| institution | Directory Open Access Journal |
| issn | 2283-9216 |
| language | English |
| last_indexed | 2024-12-19T14:11:49Z |
| publishDate | 2018-08-01 |
| publisher | AIDIC Servizi S.r.l. |
| record_format | Article |
| series | Chemical Engineering Transactions |
| spelling | doaj.art-c54ba36f4df94a268978efbd63a935882022-12-21T20:18:07ZengAIDIC Servizi S.r.l.Chemical Engineering Transactions2283-92162018-08-017010.3303/CET1870166Reliability - Redundancy Allocation in Process GraphsZoltan SuleJanos BaumgartnerJanos AbonyiProcess graphs (P-graphs) have been proven to be useful in identifying optimal structures of process systems and business processes. The provision of redundant critical units can significantly reduce operational risk. Redundant units and subsystems can be modelled in P-graphs by adding nodes that represent logical conditions of the operation of the units. It is revealed in this paper that P-graphs extended by logical condition units can be transformed into reliability block diagrams and based on the cut sets and path sets of the graph a polynomial risk model can be extracted. Since the exponents of the polynomial represent the number of redundant units, the cost function of the reliability – redundancy allocation problem as a nonlinear integer programming model can be formalised, where the cost function handles the costs associated with consequences of equipment failure and repair times. The applicability of this approach is illustrated in a case study related to the asset-intensive chemical, oil, gas and energy sector. The results show that the proposed algorithm is useful for risk-based priority resource allocation in a reforming reaction system.https://www.cetjournal.it/index.php/cet/article/view/596 |
| spellingShingle | Zoltan Sule Janos Baumgartner Janos Abonyi Reliability - Redundancy Allocation in Process Graphs Chemical Engineering Transactions |
| title | Reliability - Redundancy Allocation in Process Graphs |
| title_full | Reliability - Redundancy Allocation in Process Graphs |
| title_fullStr | Reliability - Redundancy Allocation in Process Graphs |
| title_full_unstemmed | Reliability - Redundancy Allocation in Process Graphs |
| title_short | Reliability - Redundancy Allocation in Process Graphs |
| title_sort | reliability redundancy allocation in process graphs |
| url | https://www.cetjournal.it/index.php/cet/article/view/596 |
| work_keys_str_mv | AT zoltansule reliabilityredundancyallocationinprocessgraphs AT janosbaumgartner reliabilityredundancyallocationinprocessgraphs AT janosabonyi reliabilityredundancyallocationinprocessgraphs |