NDLI: A system for design decisions based on reliability block diagrams

Content Provider	IEEE Xplore Digital Library
Author	Gissler, B. Shrivastava, P.
Copyright Year	2015
Description	Author affiliation: Halliburton Completion Tools, Spring, TX, USA (Gissler, B.; Shrivastava, P.)
Abstract	A `Reliability Block Diagram' (RBD) is a Design-for-Reliability (DfR) tool that is used for analysis of reliability allocation, availability, and maintainability. Furthermore, if applied systematically, RBD can also be used as an aid for making design decisions, especially during the improvement stage of a design. This paper discusses the application of RBD during the design improvement process of an electro-hydraulic control module. This electro-hydraulic control module provides the flow control capabilities which allow the well operator to optimize reservoir performance. The cost of failure of these control modules is very high as it directly effects the production and total losses could be millions of dollars. Therefore, this system is designed with reliability being paramount. RBD is an effective tool to perform system reliability analyses. When used as a design improvement decision tool, RBD is applied iteratively, and process steps for applying RBD in design decisions are described in detail in this paper. Once the RBD of the current system design was developed, the Reliability Importance (RI) metrics were evaluated to identify the relative importance of each subsystem with respect to the overall reliability of the system. RI is a valuable tool when used in this capacity to prioritize the design actions for reliability improvement. The Static RI diagram of the current design helped identify subassemblies with the highest RI index. The identified subassemblies then were prioritized for redesign to improve system reliability. Reliability improvement techniques considered for enhancing system reliability in this paper were (1) fault tolerance and (2) fault avoidance. Fault tolerance was achieved by redundancy, whereas fault avoidance was achieved by using high-quality and high-reliability components. Relatively, application of fault tolerance provides high reliability incremental vis-à-vis fault avoidance. However, fault tolerance methods generally are more expensive to use than fault avoidance methods, and thus, an RBD can be a vital tool in determining whether to improve the system reliability by fault tolerance, fault avoidance, or both. For each design alternative, an associated RBD was developed to capture system interactions, and system reliability was estimated. The electro-hydraulic control module presented here will demonstrate how RBDs are applied for both fault tolerance and fault-avoidance techniques. This paper highlights a successful application of RBD as a decision-making tool for design upgrades of a complex system.
Starting Page	1
Ending Page	6
File Size	477353
Page Count	6
File Format	PDF
e-ISBN	9781479967032
DOI	10.1109/RAMS.2015.7105105
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Reliability engineering Assembly Fault tolerance Fault tolerant systems Circuit faults Valves Reliability Block Diagram Reliability Modelling Intelligent Completions Design Decisions
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in