MAY-JUN 2017

Issue link:

Contents of this Issue


Page 45 of 53

46 INTECH MAY/JUNE 2017 WWW.ISA.ORG what challenges and costs to expect. Per ISA-18.2, enhanced and advanced alarm methods typically go beyond the basic methods and techniques that are usually, or at least initially, applied. While significant improvement in alarm system function and performance can usually be made by following the ba- sic alarming methods and principles, in some cases they may not be sufficient to achieve the goals for performance and operator guidance stated in the alarm philosophy. • ISA-TR18.2.6-2012, Alarm Systems for Batch and Discrete Processes, covers the application of alarm man- agement principles in ISA-18.2 to batch and discrete processes. The general principles and techniques described are intended for use in the life-cycle management of an alarm system based on programmable elec- tronic controller and computer-based human-machine interface technol- ogy. Following the guidance will help to identify and address alarm specifi- cation, design, implementation, and management opportunities that are important to batch and discrete processes. It will also help minimize the generation of nuisance alarms that could complicate and frustrate an operator's awareness, under - standing, and response to abnormal situations. For information about viewing or ob - taining ANSI/ISA-18.2-2016, the new ISA-TR18.2.7-2017, and the additional ISA18 technical reports, please visit www. For information on ISA18, contact Charley Robinson of ISA Standards ( n packaged system interfaces are speci- fied, designed, and implemented. Pros and cons of several design techniques are discussed from an alarm system point of view; the system designer should se- lect the best packaged system interface option to use for the given application. Previously published ISA18 technical re- ports that support the ISA-18.2 standard include: • ISA-TR18.2.2-2016, Alarm Identifica- tion and Rationalization, addresses alarm identification and rationalization for facilities in the process industries for such purposes as improving safety, environmental protection, product quality, equipment protection, and plant productivity. The methods de- scribed are applicable to batch and dis- crete processes as well as continuous processes. • ISA-TR18.2.3-2015, Basic Alarm De- sign, provides guidance on imple- menting the practices set forth in ISA- 18.2. Following the life-cycle model of ISA-18.2, the document assumes that alarms to be addressed in basic alarm design have completed rationalization where attributes, such as alarm set point and priority, have been defined. • ISA-TR18.2.5-2012, Alarm System Monitoring, Assessment, and Audit- ing, provides guidance on the use of alarm system analysis for both ongoing monitoring and periodic performance assessment. Monitoring, assessment, and audit are essential to achieving and maintaining the performance ob- jectives of the alarm system. These activities can identify improvement opportunities in the other life-cycle stages, such as philosophy, rationaliza- tion, detailed design, implementation, operation, maintenance, and manage- ment of change. • ISA-TR18.2.4-2012, Enhanced and Advanced Alarm Methods, helps us- ers to evaluate when to use enhanced and advanced alarming methods, what benefits they can achieve, and I SA has published the latest in a series of technical reports that support the understanding and application of the widely used ANSI/ISA-18.2-2016, Man- agement of Alarm Systems for the Pro- cess Industries. ISA-TR18.2.7, Alarm Management When Utilizing Packaged Systems, pro- vides guidance on how to integrate pack- aged systems into basic process control system-based centralized alarm systems. The technical report addresses various is sues that can arise when ISA-18.2 work processes are applied to facilities where packaged systems are used, and gives guidance on how to successfully apply ISA- 18.2 in these situations. A packaged system, in the context of the technical report, can be visualized as exist- ing outside of the basic process control system. It is a separate entity, usually con- taining an embedded microprocessor, con- troller, or hardwired logic, which performs specific tasks for a piece of equipment or a process operating within a facility. Most packaged systems can be configured to send alarm or status information to a basic process control system, directly to an alarm annunciation system, or both. "Packaged systems have long been a great source of frustration for automa- tion professionals, especially when it comes to integrating them into the plant control system environment," points out Graham Nasby, water SCADA and security specialist – Water Services, City of Guelph, Ontario. Nasby served with Jo seph Alford as a co-chair of the ISA18 working group that developed the tech- nical report. "Drawing on the experi- ences of end users, designers, vendors, and system integrators, the technical report provides guidance on how to suc- cessfully integrate alarms from packaged systems into plantwide control systems. It is an effective guide for how to apply alarm management principles in plants that use packaged systems." The technical report addresses alarm- ing-specific issues that can arise when New ISA18 technical report on alarm management standards | New Benchmarks & Metrics Please send it to Have an idea for an ISA standard, book, training course, conference topic, or other product or service?

Articles in this issue

Links on this page

Archives of this issue

view archives of InTech - MAY-JUN 2017