Alarm systems EEMUA

Industry guidance on human-computer interfaces (FICIs) Process plant control desks utilising human-computer Interfaces ) and alarm systems (EEMUA 191 A guide to design, management and procurement) also discusses the role of the control room operator, and notes how this... 

Alarms (Chapter 12)— This chapter presents an assessment of alarm systems. EEMUA 191 is a guide to the design, management, and procurement of alarm systems. It covers all aspects of human factors in the design of alarm systems for control centers, such as alarm system philosophy, key design principles, and key performance metrics. The approaches taken are... 

Much of the following description has been synthesized from the Engineering Equipment and Materials Users Association (EEMUA) guide to alarm systans, EEMUA 191 2007 (EEMUA, 2007). The EEMUA guide provides a comprehensive description of the many factors influencing the design of an alarm system. EEMUA 191 2007 points out that alarm systems shoul ... 

Process owners should also consider alarm-system guidance provided in other standards and practices. For example, the Engineered Equipment and Materials Users Association (EEMUA), Health Safety Executive (HSE), and The International Society of Automation (ISA) have developed extensive guidance on alarm management. Design of alarm systems should consider ISA 18.1-1979, ANSI/ISA 18.2-2009, ISA RP 60.3-1985, ISA RP 60.6-1984, EEMUA 191-2007, ANSI/IEEE-845-1999, ANSI/IEEE-Std 1023-2004, IEEE-1289-1998 and NUREG-0700 Rev 2-2002. 

EEMUA 191-2007, Alarm Systems - A Guide to Design, Management and Procurement, 2" edition, Engineering Equipment and Materials Users Association, www.eemua.co.uk. ISBN 0859311554, 2007. 

Human flictors The display/log presentations have lot of bearing on operator action. Alarm presentation is extremely important so that many human errors can be avoided. Recommendations by the Engineering Equipment and Materials Users Associations (EEMUAs) are very useful here. A typical recommendation of EEMUA in connection with alarm system has been depicted in Fig. lV/1.5.1-2. 

Engineering Equipment Materials Users Associatian (EEMUA) Alarm system objective Aiarm shaii... 

Details about alarm system with life cycle have been discussed in Chapter IX under SIS components, keeping in mind various guidelines, for example, EEMUA 191 and standards like ISA 18.2 2009 and lEC 62682 2014. 

Alarm Systems A guide to design, management and procurement EEMUA 191 (Second edition) Engineering Equipment Materials User s Association 2007 ISBN 978 0 85931 155 7... 

The questionnaire taken from the appendix of EEMUA 201 2002 was distributed to all control room staff, and 31 responded. Participants were asked to provide subjective responses to the alarm system. As with all subjective assessments, care should be taken in the interpretation of this data. The users were taken from a variety of job titles see Table 11.4. Operators had an average of 9.1 years (standard deviation, 7.4 years) of experience with the current systan. The operators were asked to respond to a number of questions related to the SCADA system. The following represents a summation of their subjective opinion. As with all subjective opinions on system design and performance, care should be taken in the interpretation of these results. There is not always a direct correlation between user opinion and system performance. 

Engineering Equipment Materials Users Association (EEMUA). Alarm systems—a guide to design, management and procurement. 2nd ed. London, UK EEMUA 2007. [Publication 191]. 

EEMUA also recommends that for a control system with >1000 configured alarms should have standing alarm <10 and shelved alarm (other than maintenance shelved alarms) <30. 

Each of these categories represents different activities, behaviors, and competencies. It is therefore not surprising that the display requirements for these categories of activity differ. Guidelines such as EEMUA 201 2002 advocate the use of multiple screens, such that read-only screens display only the current system picture and alarms status. These displays should be supplemented with additional displays for optimization and abnormal situation handling. 

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