Fisher A41 Instruction Manual Supplement
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Fisher A41 Instruction Manual Supplement

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Instruction Manual Supplement
D103546X012
Safety manual for Fisher
Purpose
This safety manual provides information necessary to design, install, verify and maintain a Safety Instrumented
Function (SIF) utilizing the Fisher A41 valve.
WARNING
This instruction manual supplement is not intended to be used as a stand-alone document. It must be used in conjunction
with the following manual: Fisher A41 High Performance Butterfly Valve Instruction Manual (D500211X012)
Failure to use this instruction manual supplement in conjunction with the above referenced manual could result in personal
injury or property damage. If you have any questions regarding these instructions or need assistance in obtaining any of
these documents, contact your
Introduction
This manual provides necessary requirements for meeting the IEC 61508 or IEC 61511 functional safety standards.
Figure 1. Fisher A41 Valve
W9269
www.Fisher.com
Emerson sales office
or Local Business Partner.
A41 Valve
™
A41 Valve
June 2017

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Summary of Contents for Fisher A41

  • Page 1 This instruction manual supplement is not intended to be used as a stand-alone document. It must be used in conjunction with the following manual: Fisher A41 High Performance Butterfly Valve Instruction Manual (D500211X012) Failure to use this instruction manual supplement in conjunction with the above referenced manual could result in personal injury or property damage.

  • Page 2: Terms And Abbreviations

    A41 Valve Instruction Manual Supplement June 2017 D103546X012 Terms and Abbreviations Safety: Freedom from unacceptable risk of harm. Functional Safety: The ability of a system to carry out the actions necessary to achieve or to maintain a defined safe state for the equipment / machinery / plant / apparatus under control of the system.

  • Page 3: Related Literature

    Sector Product Description The Fisher A41 valve features an eccentrically mounted disc with a soft or stainless steel seal ring. Soft seals provide excellent sealing capabilities in both flow directions. The metal seal ring provides excellent shutoff against pressure applied in the recommended flow direction for both liquid and gas applications. The NOVEX and Phoenix III metal seals are available for demanding applications requiring excellent shutoff capabilities.

  • Page 4: Application Limits

    June 2017 D103546X012 The A41 valve is intended to be part of final element subsystem as defined per IEC 61508 and the achieved SIL level of the designed function must be verified by the designer. Pressure, Temperature, and Environmental limits The designer of a SIF must check that the product is rated for use within the expected environmental limits.

  • Page 5: Sil Capability

    Random Integrity A41 valves are classified as a Type A device according to IEC 61508, having a hardware fault tolerance of 0. The complete final element subsystem, with a Fisher butterfly valve as the final control element, will need to be evaluated to determine the Safe Failure Fraction of the subsystem.

  • Page 6: General Requirements

    The system's response time shall be less than process safety time. The final control element subsystem needs to be sized properly to assure that the response time is less than the required process safety time. The A41 valve will move to its safe state in less than the required SIF's safety time (a typical value is 3 seconds) under the specified conditions.

  • Page 7: Operation And Maintenance

    Operation and Maintenance Suggested Proof Test The objective of proof testing is to detect failures within the A41 valve that is not detected by any automatic diagnostics of the system. Of main concern are undetected failures that prevent the Safety Instrumented Function from performing its intended function.

  • Page 8: Start-Up Checklist

    Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user. Fisher is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co.

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