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SIL Safety Manual

D103401X012

ED, ES, ET, EZ, HP, HPA Valves w/ 657/667 Actuator

November 2011

9

Pneumatic piping to the actuator shall be kept as short and straight as possible to minimize the airflow restrictions and

potential clogging. Long or kinked pneumatic tubes may also increase the valve closure time.

The ED, ES, ET, EZ, HP, or HPA valve shall be mounted in a low vibration environment. If excessive vibration can be

expected special precautions shall be taken to ensure the integrity of pneumatic connectors or the vibration should be

reduced using appropriate damping mounts.

Operation and Maintenance

Suggested Proof Test

The objective of proof testing is to detect failures within an ED, ES, ET, EZ, HP, or HPA valve that are 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.

The frequency of proof testing, or the proof test interval, is to be determined in reliability calculations for the Safety

Instrumented Functions for which an ED, ES, ET, EZ, HP, or HPA valve is applied. The proof tests must be performed

more frequently than or as frequently as specified in the calculation in order to maintain the required Safety Integrity

of the Safety Instrumented Function.

The proof test shown in table 1 is recommended. The results of the proof test should be recorded and any failures that

are detected and that compromise functional safety should be reported to Emerson Process Management. The

suggested proof test consists of a full stroke of the ED, ES, ET, EZ, HP, or HPA valve.

The person(s) performing the proof test of an ED, ES, ET, EZ, HP, or HPA valve should be trained in SIS operations,

including bypass procedures, valve maintenance and company Management of Change procedures. No special tools

are required.

Repair and replacement

Repair procedures in the appropriate valve instruction manual must be followed.

Manufacturer Notification

Any failures that are detected and that compromise functional safety should be reported to Emerson Process

Management. Please contact Emerson Process Management customer service or your local Emerson Process

Management service representative.

Status of the Document

Releases

Version History:

(Version, Status, Date)

Содержание ES

Страница 1: ...or HPA valve with 657 667 actuator Introduction This manual provides information that is necessary for meeting the IEC 61508 or IEC 61511 functional safety standards Figure 1 Fisher Valve with 667 Actuator W1916 2 ED or ET Valve EZ Valve with FIELDVUEt DVC6200 Digital Valve Controller HP Valve with FIELDVUE DVC6200 Digital Valve Controller X0183 1 W8120A 2 ES Valve W2174 3 SIL Safety Manual D10340...

Страница 2: ...ail Safe Failure that causes the valve to go to the defined fail safe state without a demand from the process Fail Dangerous Failure that does not respond to a demand from the process i e being unable to go to the defined fail safe state Fail Dangerous Undetected Failure that is dangerous and that is not being diagnosed by automatic stroke testing Fail Dangerous Detected Failure that is dangerous ...

Страница 3: ...at results in either a safe fault or a diagnosed unsafe fault SIF Safety Instrumented Function a set of equipment intended to reduce the risk due to a specific hazard a safety loop SIL Safety Integrity Level discrete level one out of a possible four for specifying the safety integrity requirements of the safety functions to be allocated to the E E PE safety related systems where Safety Integrity L...

Страница 4: ...r EZ Sliding Stem Control Valve Bulletin D100025X012 Fisher EZ easy et Control Valve Instruction Manual D100401X012 51 2 HP Fisher HP Series Control Valves Bulletin D101635X012 Fisher HP and HPA Control Valves Instruction Manual D101634X012 Guidelines References D Safety Integrity Level Selection Systematic Methods Including Layer of Protection Analysis ISBN 1 55617 777 1 ISA D Control System Safe...

Страница 5: ... and balanced push down to close valve plug action Valve configurations are as follows ET Globe style valve with metal to PTFE seating standard for all except Cavitrol III cages for stringent shutoff requirements or metal to metal seating standard for Cavitrol III cages optional for all others for higher temperatures EAT Angle version of ET used to facilitate piping or in applications which requir...

Страница 6: ...ve does not perform any automatic diagnostic functions by itself and therefore it has no diagnostic response time of its own However automatic diagnostics of the final control subsystem may be performed such as Partial Valve Stroke Testing PVST This typically will exercise the valve over a small percentage of its normal travel without adversely affecting the flow through the valve If any failures ...

Страница 7: ...lete final element subsystem with a Fisher valve as the final control element will need to be evaluated to determine the Safe Failure Fraction of the subsystem If the SFF for the entire final element subsystem is between 60 and 90 a design can meet SIL 2 HFT 0 Safety Parameters For detailed failure rate information refer to the Failure Modes Effects and Diagnostic Analysis Report for the ED ES ET ...

Страница 8: ... instructions warnings and cautions in each applicable instruction manual The Fisher ED ES ET EZ HP or HPA valve must be installed per standard practices outlined in the appropriate instruction manual The environment must be checked to verify that pressure and temperature conditions do not exceed the ratings The ED ES ET EZ HP or HPA valve must be accessible for physical inspection Table 1 Recomme...

Страница 9: ...mented Functions for which an ED ES ET EZ HP or HPA valve is applied The proof tests must be performed more frequently than or as frequently as specified in the calculation in order to maintain the required Safety Integrity of the Safety Instrumented Function The proof test shown in table 1 is recommended The results of the proof test should be recorded and any failures that are detected and that ...

Страница 10: ...ests defined and documented Routing of pneumatic connections determined SIS logic solver requirements for partial stroke tests defined and documented Design formally reviewed and suitability formally assessed Implementation Physical location appropriate Pneumatic connections appropriate and according to applicable codes SIS logic solver valve actuation test implemented Maintenance instructions for...

Страница 11: ...SIL Safety Manual D103401X012 ED ES ET EZ HP HPA Valves w 657 667 Actuator November 2011 11 ...

Страница 12: ...itions which are available upon request We reserve the right to modify or improve the designs or specifications of such products at any time without notice EFisher Controls International LLC 2010 2011 All Rights Reserved Fisher FIELDVUE and easy e are marks owned by one of the companies in the Emerson Process Management business division of Emerson Electric Co Emerson Process Management Emerson an...

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