Unmanned Platform Design Methodology

2021 ◽  
Author(s):  
Graham Nicholson ◽  
Graham Brown ◽  
Ben Seymour
Keyword(s):  
Economic Benefits ◽  
Reliability Data ◽  
Component Reliability ◽  
New Approach ◽  
Methodical Approach ◽  
Successful Design ◽  
Ram Analysis ◽  
Availability Assessment ◽  
Overall Reliability ◽  
Reliability And Availability

Abstract Remotely operated and unmanned facilities offer significant safety, environmental and economic benefits over conventional facilities. This paper describes the key elements for successful design and an approach for evaluating the reliability, availability and TOTEX of unmanned facilities. The approach was developed during the concept and FEED phases of a wellhead platform project and forms the basis of the unmanned strategy going forwards but can also be used for facilities with partial processing topsides. During the design of a recent platform it became clear that normal FMEA/RAM analysis was not suitable for assessing the reliability and availability of unmanned facilities with low visit frequency. Drawing on previous experience, a new approach was developed to address the specific challenges of low maintenance intervals and provide a methodical approach to proving reliability. The new approach improved confidence in the predicted availability by identifying key components and appropriate reliability data. The process adds some extra steps to typical reliability and availability assessment, which are designed to address the specific demands of unmanned operations. The result of this work has given a clearer understanding of how reliability can be assessed and managed for low-manned or unmanned applications. The methodology helps to identify unmanned /low manned opportunities and provides guidance on design and reliability assessment It is observed that system reliability is usually driven by a few key components and that whilst many components have good overall reliability data this may not be applicable for the proposed specific operating environment and maintenance regime of an unmanned platform. It is therefore essential to evaluate components individually for their specific applications. It is concluded that to achieve the unmanned goal it is vital to fully understand the system and component reliability early in the project. The proposed methodology can be applied at any stage to validate the design, confirm assumptions, or identify gaps.

An Analysis for a Precise Reliability and Availability Assessment of “Photovoltaic System” Pilot Site: a Case Study

2021 ◽  
Author(s):  
Fabio Leccese ◽  
Enrico Petritoli ◽  
Marco Cagnetti ◽  
Silvia Sangiovanni ◽  
Luca Podesta ◽  
...  
Keyword(s):  
Photovoltaic System ◽  
Pilot Site ◽  
Availability Assessment ◽  
Reliability And Availability

A New Approach to Supply Chain Performance Measurement

2016 ◽  
pp. 111-128
Author(s):  
Amit Kumar Marwah ◽  
Girish Thakar ◽  
R. C. Gupta
Keyword(s):  
Factor Analysis ◽  
Supply Chain ◽  
Performance Measures ◽  
Research Work ◽  
Primary Data ◽  
Supply Chain Performance ◽  
New Approach ◽  
Factors Affecting ◽  
Manufacturing Organizations ◽  
Overall Reliability

Existing research work has established that many of today's manufacturing organizations have failed to develop a comprehensive supply chain performance measures. In this chapter, the authors intend to empirically assess the effects of supplier buyer relations and human metrics on supply chain performance in the context of Indian manufacturing organizations. After rigorous literature review, total 18 variables have been identified which are later on reduced in number by factor analysis. As a pilot study, primary data is collected from 100 manufacturing organizations by means of a questionnaire and a scale is developed. On a sample size of 100, the proposed hypotheses are tested by applying two-tailed tests. t-test and factor analysis resulted in 5 factors, 2 related to supplier-buyer relations and 3 related to human metrics. The overall reliability of the scale comes out to be 0.697. The research work provides a new approach to the manufacturing organizations to understand the factors affecting supply chain performance. The present study is limited to Indian manufacturing organizations.

scholarly journals A new approach for interexaminer reliability data analysis on dental caries calibration

2007 ◽  
Vol 15 (6) ◽  
pp. 480-485 ◽  
Author(s):  
Andréa Videira Assaf ◽  
Elaine Pereira da Silva Tagliaferro ◽  
Marcelo de Castro Meneghim ◽  
Cristiana Tengan ◽  
Antonio Carlos Pereira ◽  
...  
Keyword(s):  
Data Analysis ◽  
Dental Caries ◽  
Reliability Data ◽  
New Approach ◽  
Interexaminer Reliability

A new approach to evaluate the performance of partially propped hydraulic fractures

2013 ◽  
Vol 53 (1) ◽  
pp. 355 ◽  
Author(s):  
Luiz Bortolan Neto ◽  
Aditya Khanna ◽  
Andrei Kotousov
Keyword(s):  
Sensitivity Study ◽  
Economic Benefits ◽  
Productivity Index ◽  
Hydraulic Fractures ◽  
Fracture Geometry ◽  
Fracture Conductivity ◽  
New Approach ◽  
Fracture Length ◽  
Compressive Stresses ◽  
Initial Fracture

A new approach for evaluating the performance of hydraulic fractures that are partially packed with proppant (propping agent) particles is presented. The residual opening of the partially propped fracture is determined as a function of the initial fracture geometry, the propped length of the fracture, the compressive rock stresses, the elastic properties of the rock, and the compressibility of the proppant pack. A mathematical model for fluid flow towards the fracture is developed, which incorporates the effects of the residual opening profile of the fracture and the high conductivity of the unpropped fracture length. The residual opening profile of the fracture is calculated for a particular case where the proppant pack is nearly rigid and there is no closure of the fracture faces due to the confining (compressive) stresses. A sensitivity study is performed to demonstrate the dependence of the well productivity index on the propped length of the fracture, the proppant pack permeability, and the dimensionless fracture conductivity. The sensitivity study suggests that the residual opening of a fracture has a significant impact on production, and that partially propped fractures can be more productive than fully propped fractures. Application of this new approach can lead to economic benefits.

scholarly journals Biodiversity offsets and caribou conservation in Alberta: opportunities and challenges

Rangifer ◽  
2015 ◽  
Vol 35 (2) ◽  
pp. 99
Author(s):  
Christine B. Robichaud ◽  
Kyle H. Knopff
Keyword(s):  
Habitat Restoration ◽  
Rangifer Tarandus ◽  
Positive Impact ◽  
Action Plan ◽  
Economic Benefits ◽  
Recovery Strategy ◽  
Implementation Challenges ◽  
Natural Resource Extraction ◽  
Biodiversity Offsets ◽  
Successful Design

The federal recovery strategy for boreal woodland caribou (Rangifer tarandus caribou) sets a goal of self-sustaining populations for all caribou ranges across Canada. All caribou herds in Alberta are currently designated as not self-sustaining and the recovery strategy requires an action plan to achieve self-sustaining status. At the same time, continued natural resource extraction in caribou ranges may be worth hundreds of billions of dollars. Some regulatory bodies have recognized an opportunity for biodiversity offsets to help meet the caribou recovery strategy’s goals while still permitting economic benefits of development. In this review, we evaluate offset opportunities for caribou in Alberta and practical impediments for implementation. We conclude that a number of actions to offset impacts of development and achieve no net loss or net positive impact for caribou are theoretically feasible (i.e., if implemented they should work), including habitat restoration and manipulations of the large mammal predator-prey system. However, implementation challenges are substantial and include a lack of mechanisms for setting aside some resources for long periods of time, public opposition to predator control, and uncertainty associated with loss-gain calculations. A framework and related policy for offsets are currently lacking in Alberta and their development is urgently needed to guide successful design and implementation of offsets for caribou.

scholarly journals A new approach for the methodology of the assessment of the predicted doses to the public of the Bryansk region in the remote period after the Chernobyl NPP accident

2020 ◽  
Vol 13 (3) ◽  
pp. 68-76
Author(s):  
V. A. Yakovlev ◽  
G. Ya. Bruk
Keyword(s):  
Annual Effective Dose ◽  
Exponential Model ◽  
Internal Exposure ◽  
Critical Groups ◽  
New Approach ◽  
The Public ◽  
Methodical Approach ◽  
Chernobyl Npp ◽  
Time Periods ◽  
Single Exponential

This study is aimed at the evaluation of the trends of the doses from internal exposure of the adult public of the Bryansk region due to the consumption of the main dose-forming food products in the remote period after the Chernobyl NPP accident and the methodical features of the assessment of the predicted doses form the internal exposure. A new methodical approach to the calculation of the predicted doses of the public from internal exposure is based on the single exponential model of the change of the dose with a time-dependent period of a half-decrease. Results of the study allowed increasing the precision of calculation of the predicted doses to the public of the Bryansk region up to 2056. A similar method (single exponential model) can be applied for the external exposure as well. That allowed calculating predicted doses of total (external + internal) exposure. As an example, the paper includes the distribution of all settlements in the Bryansk region referred to the zones of radioactive contamination by the predicted average annual effective dose to the public and critical groups in the different time periods after the accident.

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