Alarm Management Tier 3 Standard Rev6
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AUTHORIZATION
All information herein is the confidential property of Air Products and Chemicals, Inc. unless another source is shown. This information is subject to return on demand and must not be disclosed or reproduced without prior written consent. CONTROLLED COPIES OF THIS DOCUMENT ARE ON GREEN PAPER
CHEMICALS GROUP ENGINEERING
ENGINEERING STANDARD Alarm Management C3BBYYZZZ
Revision 0 October 1999 Page 1 of 4
RESPONSIBLE GROUP: Chemicals Group *Formerly COORDINATOR: Steve Eason
Denotes Revision 1. PURPOSE 1.1 Define standards for selecting, ranking, and presenting alarms to operators to effect operator actions to meet FAR targets and achieve economic benefits.
2. SCOPE 2.1 This standard applies to allChemicals Group facilities that use alarms (via control systems, annunciator systems, and / or local systems) to effect operator actions.
3. RELATED DOCUMENTS 3.1 C2S011 - Application and Use of Instrumented Systems in Process Plants 3.2 SP807 - Alarm Management for Complex Plants
4. DEFINITIONS Alarm - An annunciated (audible) state that requires operator action. Alarm Priority - Relative ranking of alarms based on the alarm integrity level.. Alarm Tone - The pitch and other characteristics of an audible alarm that give it an unique sound. Alarm Volume - The “loudness” of an audible alarm. Typically, the alarm volume is 6-10 dba above ambient conditions.
Consequence - The relative impact of an event that an alarm is trying to prevent. Event - An occurrence that causes a system / process upset. Integrity Level - The degree of importance attached to an alarm based on urgency and consequence of an event.
Plant - A grouping of processing equipment and operations typically controlled from one control room.
PSM - Process Safety Management. Shift - A regular work period of operations - typically 8-12 hours. C3BBYYZZZ, Rev. 0, Page 2 of 4
All information herein is the confidential property of Air Products and Chemicals, Inc. unless another source is shown. This information is subject to return on demand and must not be disclosed or reproduced without prior written consent. CONTROLLED COPIES OF THIS DOCUMENT ARE ON GREEN PAPER
Urgency - The relative amount of time that an operator has to respond to an alarm (event). Generally, urgency can be stated in terms of minutes, hours, or shift (i.e. does the operator have minutes, hours, or shift to respond to an alarm).
5. REQUIREMENTS 5.1 The Director of Engineering is responsible for deployment of this standard. The individual facility managers are responsible for implementation of this standard. 6. STANDARD PRACTICE This standard requires that all plants within a facility develop a Tier 4 document that is specific to its needs and is based on the type of control and alarm system used. The individual facility’s Tier 4 document will define how alarms will be clearly prioritized to the operator in order of importance and will include the following: Definition of all integrity levels utilized Alarm priorities to be used vs. integrity level All coding (color, presentation, etc.) associated with those priorities Alarm tone and alarm volume for each priority Procedures for bypassing alarms and changing alarm limits including the measures that will be taken to substitute for the bypass Any requirements for proof testing of alarms Documentation standards for all alarms How notification vs. alarming will be handled by DCS (if applicable) Training expectations including frequency of retraining for all affected users / groups. Other system / plant specific issues.
All alarms are to be assigned an integrity level based on a matrix of urgency vs. consequence. The integrity level for alarms are based on the integrity levels for instrumentation defined in Application and Use of Instrumented Systems in Process Plants (C2S011).
Table 1 Urgency vs. Consequence Matrix
Consequence Urgency CS High Low Very Low - None Minutes Level 3 Level 2 Level 1 No Alarm Hours NA Level 2 Level 1 No Alarm Shift NA Level 1 Level 1 No Alarm
There are 3 primary integrity levels. Level 3 alarms are for Critical Safety protection and are used for events that would be immediately dangerous to life.. Level 3 alarms are required to be segregated from all the other alarms. For example, in a plant with a DCS (Distributed Control System), Level 3 alarms will be hard wired to a separate (from DCS) alarm annunciator and grouped together. In plants with no DCS, Level 3 alarms at a minimum will be grouped together in an alarm annunciator or preferably all Level 3 alarms should be contained in a separate alarm annunciator. In both of these cases, the Level 3 alarms will be color coded such that they are different than other alarms in the annunciator.
