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Blog Entry: So what does Interference-Free mean? And why do we care?
An Interference-Free component, either as an interface or a defined functional area, is a system component that is neither safety critical (C3) nor safety relevant (C2), but interfaces with such subsystems. If a component has been shown to be interference free (C1), then it has been demonstrated that no failure…
Bifold Fluidpower Ltd. - FP Series Solenoid Valves
IEC 61508 in the Safety Automation Equipment List
News Item: Beware of Forged exida Certificates!
It was brought to our attention lately that there are more and more exida forged certificates appearing in the marketplace. As the global leader in process industry functional safety certification, exida maintains a list of valid certificates on our web site – www.sael-online.com . This has been an effective tool…
Blog Entry: Getting Good Proof Test Coverage Numbers
Several years ago we recognized that proof test coverage was an important variable that must be considered when doing PFDavg calculations. We ran some models and discovered that the difference between “perfect” proof test coverage (100%) and a very good 90% could mean a whole SIL level in the result.…
Blog Entry: Nuisance Alarms and “The Boy Who Cried Wolf”
The purpose of an alarm is pretty straightforward - to draw the operator’s attention to an abnormal situation that requires action in order to prevent an undesired consequence . Alarms that don’t meet this principle often become nuisance alarms. A nuisance alarm is defined as: “an alarm that annunciates excessively,…
VEGA Grieshaber KG - VEGASWING 66
IEC 61508, ASME 31.8S:2012 in the Safety Automation Equipment List
Recorded Webinars: How Effective are the Proof Tests of your Final Elements?
Most engineers who design and verify safety instrumented functions (SIFs) understand how hard it is to design a manual proof test with high effectiveness (also called high proof test coverage).
Proof test coverage is an important variable in Safety Instrumented System design that can impact risk reduction by an entire SIL level. This is shown in PFDavg calculations.
Everyone in functional safety will tell you that “safety” will vary from site to site, let alone manufacturer to manufacturer. We will start the webinar with the exida approach to unravelling these safety differences.
This webinar will explain proof test coverage, why this is an important safety parameter, and show that the real objective is to detect failures NOT detected by automatic diagnostics. The seminar will explain how proof test coverage is calculated and show several examples of proof test procedures along with the test coverage.
Recorded Webinars: Personnel Certification: Going for GOLD in the New Year
Have you ever wanted to become a leader? A mentor? Or just want to be able to understand and do more for your company and yourself? Have you ever shopped around and searched for the Personnel Certification that was right for you but got confused by all the acronyms from various organizations? This webinar will clear up any confusion. It will help guide those interested in becoming better personally in the field of Functional Safety, Alarm Management, or CyberSecurity.
News Item: New White Paper - Improving Reliability & Safety Performance of Solenoid Valves by Stroke Testing
Solenoid valves integrated into the design of emergency shutdown (ESD) valves used in industrial process systems, can tend to bind, i.e., to become stuck in one position, when not moved for long periods of time. This binding, also known as failure due to excessive stiction, has significant negative impacts on…
White Paper: Improving Reliability & Safety Performance of Solenoid Valves by Stroke Testing
Solenoid valves integrated into the design of emergency shutdown (ESD) valves used in industrial process systems, can tend to bind, i.e., to become stuck in one position, when not moved for long periods of time. This binding, also known as failure due to excessive stiction, has significant negative impacts on…
VEGA Grieshaber KG - PROTRAC 30 Series
IEC 61508 in the Safety Automation Equipment List
VEGA Grieshaber KG - VEGAMET 391
IEC 61508 in the Safety Automation Equipment List
VEGA Grieshaber KG - VEGAVIB / VEGAWAVE 60
IEC 61508 in the Safety Automation Equipment List
VEGA Grieshaber KG - VEGACAP 60
IEC 61508 in the Safety Automation Equipment List
Honeywell - SmartLine ST 700 Standard HART
IEC 61508 in the Safety Automation Equipment List
Weir Valves & Controls USA, Inc. - Atwood & Morrill FREE FLOW
IEC 61508 in the Safety Automation Equipment List
Blog Entry: High Demand Diagnostic Credit?
The IEC 61508 standard states that automatic diagnostics can only lower the dangerous undetected failure rate if those diagnostics execute 100 times faster than the expected demand rate. That requirement has always seemed excessive to many of us here at exida. As an accredited Certification Body we must enforce that…
Recorded Webinars: Industrial Automated Control System 〈IACS〉 Cybersecurity Program Management (IEC 62443)
The presence of threats, and the success of attacks has been felt by virtually every individual and organization around the world. Protecting assets must be a well-organized, wide ranging effort that involves everyone who has assets to protect. There are organizational conflicts to understand, policies to create, and specific security activities to coordinate. This webinar discusses key aspects of a Industrial Automated Control System (IACS) Cybersecurity Program, provides concrete recommendations for getting started, and references that provide additional insight.
Blog Entry: Reducing Project Lifecycle Cost with exSILentia®
The international functional safety standard IEC 61511 provides the safety lifecycle as a steadfast guideline to assess and mitigate risk for manufacturing processes including refineries, chemical, petrochemical, pulp and paper, and power plants. To achieve a functionally safe system, it is essential to follow each requirement in the standard. However,…
News Item: exida’s Dr. William Goble Presenting Paper at RAMS 2017
exida Founder Dr. William Goble will be presenting a paper at the 63rd Annual Reliability and Maintainability Symposium (RAMS) Conference in Orlando, FL on January 23rd, 2017. The paper is entitled “PROPERLY CREDITING DIAGNOSTICS IN SAFETY INSTRUMENTED FUNCTIONS FOR HIGH DEMAND PROCESSES”. This paper proposes that the 100X requirement used…