introduction to reliability engineering...outline | expectations introduction to reliability...
TRANSCRIPT
Introduction to
System Reliability
Engineering
Course Instructor
Name: Oseghale Lucas Okohue BEng. Msc. CIPMP
Position: Manager | Business Development | Snr. Consultant
Email: [email protected]
Summary : Project Management, RAMS of Production Systems (Onshore | Offshore | Subsea), Drilling Engineering
Education :PhD. RAMS of Production System (Onshore | Offshore) ‐ Inview
Msc. Subsea Engineering
BEngr . Petroleum Engineering
Copyright
All rights reserved. No part of this publication may be reproduced or
transmitted in any form or by any means, including photocopying and recording
without the written permission of the copyright holder, application for which to
be addressed to:
Email: [email protected]
Such written permission must also be obtained before any part of this
publication is stored in a retrieval system of any nature.
Brand names, company names, trademarks, or other identifying symbols
appearing in illustrations and / or test are used for educational purposes only
and do not constitute an endorsement by the author or publisher.
Aim | Objectives
Appreciation of System Reliability Engineering
Reliability Engineering
‐ Design
Outline | Expectations
Introduction to Reliability Engineering
load Strength Relationship ‐ No Overlaps
load Strength Relationship ‐ Overlaps
Objectives of Reliability Engineering
System Load | Strength Relationship
Importance of Reliability Engineering
Summary
Introduction to Reliability
Reliability is associated with unexpected failures of products or
services and understanding why these failures occur is key to
improving reliability.
The main reasons why failures occur includes:
The product is not fit for purpose or more specifically the
design is inherently incapable.
The item may be overstressed in some way.
Introduction to Reliability
Items are designed for a specific operating environment
and if they are then used outside this environment then
failure can occur.
Note : There are many reasons for failure in system the
list above is a generic list.
System Load | Strength Relationship
The load and strength of an item may be generally known,
however there will always be an element of uncertainty.
The strength values of any system components will varies.
Some components will be relatively strong while others will
be relatively weak.
Although most will be of nearly average strength.
System Load | Strength Relationship
Similarly there will be some loads greater than others but
mostly they will be average.
load Strength Relationship ‐ No OverlapsMaximum Load Maximum Strength
Note: The load strength relationship with no overlap shows
the maximum load and strength that can be withstand.
load Strength Relationship ‐ Overlaps
However if, there is an overlap of the two distributions then
failures will occur.
load Strength Relationship ‐ Overlaps
Note:
Introduction of safety margin ensures that there is no overlap
of these distributions.
load Strength Relationship ‐ Overlaps
Thus, to ensure good reliability the causes of failure need
to be identified and eliminated.
Objectives of Reliability Engineering
Objectives of reliability engineering are as follows:
To apply engineering knowledge to prevent or reduce
the likelihood or frequency of failures;
To identify and correct the causes of failure that do occur;
To determine ways of coping with failures that do occur;
Objectives of Reliability Engineering
To apply methods of estimating the likely reliability of
new designs, and for analyzing reliability data.
Importance of Reliability
Why is Reliability important?
Unreliability has a number of unfortunate consequences and
therefore for many products and services is a serious threat.
Importance of Reliability
For example poor reliability can have implications for:
Safety
Competitiveness
Profit margins
Cost of repair and maintenance
Delays further up supply chain
Reputation
Good will
Summary
Reliability is a measure of uncertainty and therefore
estimating reliability means using statistics and probability
theory.
Reliability is quality over time
Reliability must be designed into a product or service
Summary
Most important aspect of reliability is to identify cause of
failure and eliminate in design if possible otherwise identify
ways of accommodation
Reliability is defined as the ability of an item to perform a
required function without failure under stated conditions for
a stated period of time
The costs of unreliability can be damaging to a company
www.chesssubseaengineering.com