The focus is on the process industries, but most of the material will have a direct read across to other sectors. This webinar aims at providing a view based on the application of a compliance assessment process to iec61508 and highlight some of the benefits and downfalls of typical certification process for equipment or system. The work that we like to do best is functional safety assessment and audit which allows us to identify opportunities for improving compliance and efficiency project by project, but we are happy to help on other aspects too, either on an ongoing basis, or until you are ready to take on. Functional safety safety instrumented systems in process. Functional safety is the part of the overall safety of a system or piece of equipment that depends on the system or equipment operating correctly in response to its inputs, including the safe management of likely operator errors, hardware and software failures and environmental changes. For an fsa, the focus is on judgement about the functional safety and safety integrity achieved by the safetyrelated project activities under assessment. One of our goals for 2020 is to increase the accessibility of these sessions as we have customers all over the world. Certifications should be done by independent organizations with experience and strong technical depth electronics, programmable electronics, mechanical, and probabilistic analysis. Chapter 18 functional safety, assessment and auditing. Functional safety is a technically challenging field.
Leaders in risk engineering and ehs solutions safety management. Functional safety for software engineerzone spotlight. Similarly, the relevance and importance of the role of other organisations and the interfaces is apparent when read in conjunction with clause 8. Control of major accident hazards regulations the management of. Standards for functional safety require the verification or validation of all activities and results according to the foureyes principle.
Typically, the processes advocated by functional safety standards are rigorous compared to even good software development practices advocated for the nonsafety domains. Management of functional safety the assessment has demonstrated that the certified products are supported by an appropriate functional safety management system that meets the relevant requirements of iec 615081. A practical guide to achieving functional safety standards in safety critical systems makes a complex standard easy to follow and sets it in the context of risk and safety provides support for those undertaking self assessment, which can save money spent on large consultancy fees. The table below shows estimates of the gaps between cmmi and the avionics d0178 standard.
Even those who have read and understand the key features of iec 61508 ed 2 and iec 61511 may not be fully conversant with the specific details of the fsa. Safety integrity level sil assessing functional safety. Functional safety relies on active part, not on passive part. Part a discusses the concept of functional safety and the need to express targets by means of safety integrity levels. Functional safety assessments guidance on fsa stages 1.
This study uses the results of the analysis to develop potential test scenarios and identify possible areas for diagnostic trouble code coverage. M ethod offers functional safety consultancy across all the phases of the functional safety lifecycle and can carry out all the support tasks too, such as verification, functional safety assessments, functional safety audits and competency assessment and management. Dont confuse a functional safety audit with a functional. It also explains the lifecycle approach, together with the basic outline of iec 61508 known as bs en 61508 in the uk. Functional safety certification is performed by accredited certification bodies cb. Home services process safety functional safety functional safety assessment stages of fsa stage 1 hazard and risk assessment shall be carried out, the required protection layers shall be identified and safety requirement specification shall be developed. As easy as sil 1, 2, 3 abstract this paper outlines the need for planning in functional safety management. This standard applies to sil 1 through 3 with sil 3 being the most dangerous.
The intent of this book is to provide the reader with an example development process for safety. The functional safety assessment fsa is an investigation to determine if the safety function under study achieves the required level of functional safety to support a decision to either progress to the next phase of the lifecycle or remain in the same phase until all necessary measures are in place. Of course, 1st step is safety planning, and it is very important but many people dont realize its importance. This inherent risk must be reduced below internaonally accepted risk criteria using.
Iso 26262 functional safety draft international standard. This elearning module is intended as an introduction to the topic of functional safety and safety integrity level, and conveys key concepts and methodological requirements of functional safety based on the international harmonised standard iec 61511 functional safety safety instrumented systems for the process industry sector. Functional safety with iso 26262 vector consulting. A team to carry out a functional safety assessment to ensure the functional safety achievement. Escs 2020 functional safety webinar series esc have been evaluating how we can engage with our clients more effectively for training activities. The purpose of functional safety assessments fsas is twofold. Iso 26262 functional safety draft international standard for. Stage 1 hazard and risk assessment shall be carried out, the required protection layers shall be identified and safety requirement specification shall be developed.
An introduction to system safety management in the mod. Iso 26262, titled road vehicles functional safety, is an international standard for functional safety of electrical andor electronic systems in production automobiles defined by the international organization for standardization iso in 2011. The training introduces functional safety based on iso 26262. A safety system often called a safetyrelated system consists of one. Functional safety audits and assessments audits are an important tool in determining whether a companies procedures comply with the requirements of iec 61511 and whether or not the company is following its own policies and functional safety procedures. This study follows the concept phase process in the iso 26262 standard and applies hazard and operability study, functional failure modes and effects analysis, and systems theoretic process analysis methods. Several new functional safety standards require an independent safety assessment to be carried out in parallel with the development of components or systems. Identification of certified equipment a full list of certified equipment documents is defined below. Process safebook 1 functional safety in the process industry 1.
Many modern systems are very complex and the consequences of possible accidents from them are enormous in scale. Templates and checklists for drawing up your own implementation plan and information on selfcertification are also provided. Apr 19, 2017 for an fsa, the focus is on judgement about the functional safety and safety integrity achieved by the safetyrelated project activities under assessment. On the contrary, a flame scannerswitch in a utility boiler is an active system as it protects closes the fuel flow and trip master fuel relay in the event of flame failure through logi. Due to product liability and increasingly critical functions, functional safety is today mandatory for many engineers. Functional safety electrical, control and instrumentation. Identifying safety requirement is a 2nd step of functional safety activity.
Principles o f system safety december 30, 2000 3 4 3. Recent events such as the montara blowout and the deepwater horizon disaster are causing more emphasis to be. Capability to design for functional safety chapter 2. On the contrary, a flame scannerswitch in a utility boiler is an active system as it protects closes the fuel flow and trip master fuel relay in the event of flame failure through logic. On the basis of our worldwide projects, we show how functional safety is achieved in specification, analysis, testing and proof of the safety of systems. The main definitions needed to understand the basics of functional safety are as follows. Instrument, electrical, mechanical, operator, process and safety technicians, as well as operating and maintenance personnel who are involved in any of the lifecycle phases for safety instrumented systems from hazard and risk assessment, design, installation, commissioning, validation, operations and maintenance. Functional safety for the mining and machinerybased industries 2. After successful completion of the fscp programme the expert receives a fscp. Home services process safety functional safety functional safety assessment. Our approach is to develop your knowledge and competency, so that you can do more of the work yourself. In total, this study identifies eight vehiclelevel safety goals and 198 chb system functional safety requirements an output of the iso 26262 process. As with the beginning of the twentieth century, when food safety standards and the therapeutic benefits of certain foods and supplements first caught the publics attention, the dawn of the twentyfirst century finds a great social priority placed on the science of food safety. An9025 rev 4 12 the following paragraphs have the same numbering as the sub clauses of iec 615082 7.
Standard applies to functional safety of programmable electronic control systems for machinery. Functional safety an iec 61508 sil 3 compliant development. Books free updates contact hse guidance topics electrical, control. Figure 2 and table 1 of iec 615082 and figure 3 and table 1 of iec 61508 3, which provide a key to understanding the requirements iec 615082 and iec 61508 3. It is the responsibility of the assessor to use their engineering judgment and their experience to determine if the sifs under assessment are suitable and sufficient to provide the defined risk reduction for the hazardous event identified and that as far as reasonably practicable the sif shall be functionally safe. A straightforward guide to applying iec 61508 and related standards 2 by smith bsc phd ceng fiee fiqa honfsars migase. Functional safety assessment fsa is a crucial independent check for any safety instrumented system project needing an iec 61511 audit. Functional safety assessment functional safety services the hazards arising from the process and its associated equipment are properly controlled. If you are about to undertake your first functional safety or sil.
Iso 26262 road vehicles functional safety draft international standard tutorial issc 2010 minneapolis, minnesota 3 break roadmap background status part 1. What is a functional safety assessment, why do i need to do an fsa. Both the risk analysis sil requirement and the process for implementing the riskreducing measure must be assessed accordingly. A practical guide to achieving functional safety standards in safetycritical systems makes a complex standard easy to follow and sets it in the context of risk and safety provides support for those undertaking selfassessment, which can save money spent on large consultancy fees. An introduction to functional safety and safety integrity levels. The objective of functional safety is freedom from unacceptable risk of physical injury or of damage to the health of people either directly or indirectly through damage to property or to the environment by the proper implementation of one or more automatic protection functions often called safety functions. A practical approach for endusers and system integrators hima functional safety consulting services page 3 functional safety.
Part b discusses functional safety standards for the process, oil, and gas industries. Throughout this system safety handbook, the term hazard will be used to. Recent events such as the montara blowout and the deepwater horizon disaster are causing more emphasis to be placed on functional safety of control systems. In total, this study identifies four vehiclelevel safety goals and 125 eps system safety requirements an output of the iso 26262 process. The second is functional safety, which covers the safety of the equipment the euc see below that depends. M ethod process safety specialises in the early lifecycle phases associated with hazard and risk assessment. The functional safety certification programme fscp is a personnel certification programme that demonstrates an individuals proficiency in the iec 61508 functional safety standard and related industry specific standards like iso 29292 for the automotive industry. Ronald schmidt and gary rodricks food safety handbook. Sil and functional safety in a nutshell risknowlogy. To book an in house course or for more information on any of our courses please get in.
Functional safety an overview sciencedirect topics. Sis are instrumented systems that provide a significant level of risk. The first is primary safety, which concerns such risks as electric shock and burns inflicted directly by hardware. Start button stage 3 in iec61511 and operate your plant or system. For example, a fire resistant door prevents a hazard, but is not safe instrumentation for functional safety. This is the part of the overall safety objective for an item of plant that is achieved. An introduction to functional saf ety and iec 61508.
The levels of risk reduction are determined within a companys overall risk management framework to ensure that the overall. A practical approach for endusers and system integrators tino vande capelle1, dr. What is a functional safety assessment fsa, and how is. Its goal is to ensure that functional safety has been achieved within the specific scope of supply for the organizations under assessment and in the context of the safety lifecycle. As functional safety, the standard, is applicable to many industries, functional safety, the book, in its previous edition has proved to be an invaluable reference for professionals from a variety of industries. Bs en 61511, functional safety safety instrumented systems for the process. Pdf functional safety of automated driving systems.
Part 3 gives worked examples of risk assessment leading to the allocation of safety integrity levels. An important management process is functional safety assessment fsa. This affects the complete safety life cycle of protective equipment. A risknowlogy best practices publication that explains sil and functional safety in a nutshell suitable for engineers and managers alike. Verification, validation and functional safety assessment.
Readers are provided with the considerations that should inform their choices and judgements. These guidelines have been produced by the 61508 association to assist its members and others on functional safety assessment stages 1 3. Tuv rheinland functional safety technician certificate. Functional safety is the part of the overall safety relating to the process and the basic process control system bpcs which depends on the correct functioning of the sis and other protection.
Functional safety in practice 2nd ed dearden, harvey t. Functional safety is the part of the overall safety of plant and equipment that depends on the correct functioning of safety related systems and other risk reduction measures such as safety instrumented systems sis, alarm systems and basic process control systems bpcs. Start with risk assessment by doug nix in canada, ce mark, complementary protective measures, control functions, control reliability, emergency stop, eu european union, functional safety, guards and guarding, hierarchy of controls, how to, interlocks, interlocks, international, iso 849, risk. It also explains the lifecycle approach, together with the basic. Functional safety assessment setting the boundaries of the. Functional safety misrepresentations and misunderstandings. In risk management and safety literature this book on functional safety fills the void between. A three 3 hour two part competency examination compromising. The functional safety certification programme fscp is a personnel certification programme that demonstrates an individuals proficiency in the iec 61508 functional safety standard and related industry specific standards like iso 26262 for the automotive industry. Everyday low prices and free delivery on eligible orders. Unlike isoen 849, the risk assessment methodology has a quantifiable approach. It places functional safety in context, along with risk assessment, likelihood of fatality, and the cost of conformance.
227 1300 1237 207 40 288 786 1067 55 1092 119 1215 526 1221 1347 693 860 601 1158 690 503 236 626 340 253 132 231 1148 1381 229 288 5 523 835 1259 70 657 37 174 897 710 224 1023 1213