ida Certification Services IEC Functional Safety Assessment Project:

Transcription

1 e ida Certificatin Services IEC Functinal Safety Assessment Prject: Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves Custmer: Flw-Tek A Subsidary f Bray Internatinal, Inc Hustn, Texas USA Cntract Number: Q07/12-19 Reprt N.: BRA R007 Versin V2, Revisin R1, April 22, 2013 Steven Clse The dcument was prepared using best effrt. The authrs make n warranty f any kind and shall nt be liable in any event fr incidental r cnsequential damages in cnnectin with the applicatin f the dcument. All rights reserved.

2 Management summary This reprt summarizes the results f the functinal safety assessment accrding t IEC carried ut n the: Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves The functinal safety assessment perfrmed by exida cnsisted f the fllwing activities: - exida Certificatin assessed the develpment prcess used by Flw-Tek A Subsidary f Bray Internatinal, Inc by an n-site audit and creatin f a safety case against the requirements f IEC exida perfrmed a detailed Failure Mdes, Effects, and Diagnstic Analysis (FMEDA) f the devices t dcument the hardware architecture and failure behavir. - exida reviewed field failure data t ensure that the FMEDA analysis was cmplete. - exida reviewed the manufacturing quality system in use at Flw-Tek. The functinal safety assessment was perfrmed t the requirements f IEC 61508, SIL 3 fr mechanical cmpnents. A full IEC Safety Case was prepared, using the exida SafetyCasetl, and used as the primary audit tl. Hardware prcess requirements and all assciated dcumentatin were reviewed. Envirnmental test reprts were reviewed. Als the user dcumentatin (safety manual) was reviewed. The results f the Functinal Safety Assessment can be summarized as: The Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves were fund t meet the requirements f IEC fr up t SIL 3 (SIL 3 Capable). The PFD AVG and Safe Failure Fractin requirements f the standard must be verified fr a cmplete final element design using these final element cmpnents. The manufacturer will be entitled t use the Functinal Safety Lg. The manufacturer may use the mark: T-023 V2R1, August, Page 2 f 15

3 Table f Cntents Management summary Purpse and Scpe Prject management exida Rles f the parties invlved Standards / Literature used Reference dcuments Dcumentatin prvided by Flw-Tek A Subsidary f Bray Internatinal, Inc Dcumentatin generated by exida Prduct Descriptins IEC Functinal Safety Assessment Methdlgy Assessment level Results f the IEC Functinal Safety Assessment Open Issues Lifecycle Activities and Fault Avidance Measures Functinal Safety Management Safety Requirements Specificatin and Architecture Design Hardware Design Validatin Verificatin Prven In Use Mdificatins User dcumentatin Hardware Assessment Terms and Definitins Status f the Dcument Liability Releases Future Enhancements Release Signatures T-023 V2R1, August, Page 3 f 15

4 1 Purpse and Scpe This dcument shall describe the results f the IEC functinal safety assessment f Flw- Tek A Subsidary f Bray Internatinal, Inc Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves by exida accrding t the requirements f IEC 61508: ed2, The results f this prvides the safety instrumentatin engineer with the required failure data as per IEC / IEC and cnfidence that sufficient attentin has been given t systematic failures during the develpment prcess f the device. T-023 V2R1, August, Page 4 f 15

5 2 Prject management 2.1 exida exida is ne f the wrld s leading accredited Certificatin Bdies and knwledge cmpanies specializing in autmatin system safety and availability with ver 300 years f cumulative experience in functinal safety. Funded by several f the wrld s tp reliability and safety experts frm assessment rganizatins and manufacturers, exida is a glbal cmpany with ffices arund the wrld. exida ffers training, caching, prject riented cnsulting services, safety lifecycle engineering tls, detailed prduct assurance and certificatin analysis and a cllectin f n-line safety and reliability resurces. exida maintains a cmprehensive failure rate and failure mde database n prcess equipment. 2.2 Rles f the parties invlved Flw-Tek A Subsidary f Bray Internatinal, Inc Manufacturer f the Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves exida exida Perfrmed the hardware assessment. Perfrmed the IEC Functinal Safety Assessment and Surveillance audit. Flw-Tek cntracted exida in July 2009 fr the IEC Functinal Safety Assessment f the abve mentined devices. 2.3 Standards / Literature used The services delivered by exida were perfrmed based n the fllwing standards / literature. [N1] IEC (Parts 1-7): 2010 Functinal Safety f Electrical/Electrnic/Prgrammable Electrnic Safety-Related Systems 2.4 Reference dcuments Dcumentatin prvided by Flw-Tek A Subsidary f Bray Internatinal, Inc [D1] QSM, Rev 1, May 2009 FlwTek Quality System Manual [D2] IOM, Rev 1, 2008 FlwTek F15-30 Series Valve Manual [D3] Design Input, Mar 2009 Metal Seat Develpment Prgram [D4] Operatinal Engineering task List [D5] OP, Rev 2, Jul 2008 Operating Prcedures OP4 t OP8 [D6] Frm 104, Jun 2008 FlwTek Cmpetency Requirements [D7] Cert N , Jul 2008 FlwTek Mdy Certificate [D8] Cert N , Sep 2008 FlwTek Mdy Certificate fr the Quality Management System (ISO 9001:2000) T-023 V2R1, August, Page 5 f 15

6 [D9] ISO 9001 Audit, May, 2009 FlwTek Quality Systems Develpment Cmpliance [D10] Metal Seat Prgress, Aug, 2009 [D11] Design Plan, Jul 2009 [D12] WI-132, Rev 0, Mar, 2004 [D13] Test Reprt, Apr, 2005 [D14] Schedule, Oct 2009 FlwTek Metal Seat design status reprt FlwTek Design Plan Sign Off Sheet FlwTek Prttype Test Plan WI-132 FlwTek New Prduct Cycle test Reprt FlwTek Schedule fr Metal Initial Prductin [D15] ECN , Sep, 2009 FlwTek Engineering Change Ntice [D16] SM Series 7/8000, Rev 1, April 2013 [D17] SM Series F15/F30, Rev 1, April 2013 [D18] SM Series S85, Rev 1, April 2013 [D19] SM Series TRIAD, Rev 1, April 2013 [D20] ECN , May 2008 [D21] Prductin Meeting, Mar 2010 Safety Manual Quarter Turn Flating Ball Valves Series 7/8000 Safety Manual Quarter Turn Flating Ball Valves Series F15/F30, RF15/RF30 Safety Manual Quarter Turn Flating Ball Valves Series S85 Safety Manual Quarter Turn Flating Ball Valves Series TRIAD Dimensin Crrectin ECN Prductin Meeting Status Meeting Dcumentatin generated by exida [R1] BRA R001, V1R4, April 3, 2013 [R2] BRA 07/12-19 R001, V1R1, Oct 29, 2009 [R3] Bray_ SafetyCaseDB IEC esc, Mar 18, 2010 [R4] BRA R007 V2R1 FlwTek IEC Assessment.dc, April 22, 2013 FMEDA reprt, Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves IEC Prcess Gap Analysis Reprt, Flw-Tek A Subsidary f Bray Internatinal, Inc IEC SafetyCaseDB fr Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves IEC Functinal Safety Assessment, Flw-Tek A Subsidary f Bray Internatinal, Inc Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves (this reprt) T-023 V2R1, August, Page 6 f 15

7 3 Prduct Descriptins Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves descriptin: The fllwing table cntains the descriptins f the Fl-Tek Ball Valves that were the subject f this assessment. All f these valves are classified as Type A 1 devices accrding t IEC 61508, having a hardware fault tlerance f 0. Valve Family Specificatins Descriptin Triad Series Mdels FP/SP-2000/ Piece Bdies Flating ball design Stainless Steel & Carbn Steel Full Prt / Standard Prt Valve Sizes: Mdel FP: 1/4 thrugh 4 Mdel SP: 3/4 thrugh 2 1/2 Pressure Ratings: Mdel FP: 2200 psi WOG Mdel SP: 2200 psi WOG FP & SP: up t 425 psi WSP Series 7000 & 8000 Mdels 7000/ Piece Bdies Stainless Steel & Carbn Steel Full Prt Valve Sizes: 1/4 thrugh 12 Pressure Ratings: 1/4-4 : 1000 psi WOG 6-12 : 400 psi WOG Series F15 & F30 Mdels F15/F30 2 Piece Bdies Stainless Steel & Carbn Steel Full Prt Valve Sizes: 1/2 thrugh 12 Pressure Ratings: Mdel F15: ASME Class 150 Mdel F30: ASME Class 300 Triad Series ball valves are fire safe t API 6074th Editin and are designed in accrdance with ASME B16.34 specificatins. Features include live laded Smart Stem seals, a redundant bdy seal design, anti-static prtectin, lcking safety handles and ISO 5211 Secure Munt actuatr tp flange. Hex head cap screws jin end cnnectins t the tapped center sectin. Threaded, weld end, extended weld end and custm end cnnectins are ffered. Series 7000/8000 ball valves ffer threaded, scket weld, butt weld, flanged, quick clamp, and extended weld end cnnectins. Features include live laded Smart Stem seals, antistatic prtectin, ease f installatin and maintenance, lcking safety handles and ISO 5211 (1/4 2 ) actuatr tp flange. These valves are als available with cavity filler seats fr special service requirements. Series RF15/RF30 ball valves are available as nn-fire safe r fire safe t API 607 4th Editin and are designed in accrdance with ASME B16.34 specificatins. These ecnmical, ne piece Class 150/300 end entry flanged valves are an excellent cst effective chice. Features include live laded Smart Stem seals, anti-static prtectin, lcking safety handles and ISO 5211 (1-2 ) actuatr tp flange. Special bdy materials are ffered upn request. 1 Type A element: Nn-Cmplex element (using discrete cmpnents); fr details see f IEC , ed2, 2010 T-023 V2R1, August, Page 7 f 15

8 Series RF15/RF30 Series S85 Mdels RF15/RF30 1 Piece Bdies Stainless Steel & Carbn Steel Standard Prt Valve Sizes: Mdel RF15: 1 thrugh 12 Mdel RF30: 1 thrugh 12 Pressure Ratings: Mdel RF15: ASME Class 150 Mdel RF30: ASME Class Piece Bdies Full Prt Stainless Steel Valve Sizes: 1/2" thrugh 3" Pressure Ratings: - 1/2"-3": 1000 psi WOG / 150 psi WSP Series RF15/RF30 ball valves are available as nn-fire safe r fire safe t API 607 4th Editin and are designed in accrdance with ASME B16.34 specificatins. These ecnmical, ne piece Class 150/300 end entry flanged valves are an excellent cst effective chice. Features include live laded Smart Stem seals, anti-static prtectin, lcking safety handles and ISO 5211 (1-2 ) actuatr tp flange. Special bdy materials are ffered upn request. Flw-Tek s Series S85 ball valves have been designed fr ease f autmatin. Standard 2-piece valve bdies are investment cast Stainless Steel, slutin annealed fr the highest quality and added strength. All bdy castings are marked with a fundry heat number fr full traceability. These valves ffer quarter turn peratin and lw perating trque. The S85 features live-laded, selfadjusting stem seals that autmatically adjust packing t cmpensate fr changes in wear and temperature. Other features include replaceable seats and seals, antistatic devices, blwut prf stems, and stainless steel safety latch handles. T-023 V2R1, August, Page 8 f 15

9 4 IEC Functinal Safety Assessment The IEC Functinal Safety Assessment was perfrmed based n the infrmatin received frm Flw-Tek A Subsidary f Bray Internatinal, Inc and is dcumented in this reprt. A surveillance audit was cnducted in April f This reprt was revised t reflect the results f the surveillance audit. In Summary the surveillance audit did nt reveal any nn-cnfrmances. 4.1 Methdlgy The full functinal safety assessment includes an assessment f all fault avidance and fault cntrl measures during hardware develpment and demnstrates full cmpliance with IEC t the end-user. The assessment cnsiders all requirements f IEC Any requirements that have been deemed nt applicable have been marked as such in the full Safety Case reprt, e.g. sftware develpment requirements fr a prduct with n sftware. The assessment als includes a review f existing manufacturing quality prcedures t ensure cmpliance t the quality requirements f IEC As part f the IEC functinal safety assessment the fllwing aspects have been reviewed: Develpment prcess, including: Functinal Safety Management, including training and cmpetence recrding, FSM planning, and cnfiguratin management Specificatin prcess, techniques and dcumentatin Design prcess, techniques and dcumentatin, including tls used Validatin activities, including develpment test prcedures, test plans and reprts, prductin test prcedures and dcumentatin Verificatin activities and dcumentatin Mdificatin prcess and dcumentatin Installatin, peratin, and maintenance requirements, including user dcumentatin Manufacturing Quality System Prduct design Hardware architecture and failure behavir, dcumented in a FMEDA The review f the develpment prcedures is described in sectin 5. The review f the prduct design is described in sectin Assessment level The Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves have been assessed per IEC t the fllwing levels: SIL 3 capability The develpment prcedures have been assessed as suitable fr use in applicatins with a maximum Safety Integrity Level f 3 (SIL3) accrding t IEC T-023 V2R1, August, Page 9 f 15

10 5 Results f the IEC Functinal Safety Assessment exida assessed the develpment prcess used by Flw-Tek A Subsidary f Bray Internatinal, Inc fr these prducts against the bjectives f IEC parts 1 and 2. The assessment was dne n-site at the Flw-Tek A Subsidary f Bray Internatinal, Inc facility n Octber 27, 2009 and dcumented in the SafetyCase [R3]. 5.1 Open Issues The verall prcess is strng and the designs have extensive prven field experience, sufficient fr SIL 3 capability. Sme areas f imprvement were identified in the design prcess and sme f the design prcedures and frms were upgraded during the prject. All f the imprvements were evaluated and included in the final versin f the SafetyCase. The Safety Requirements Specificatin is nt in a final Bray frmat. This will be required fr Certificatin Renewal. 5.2 Lifecycle Activities and Fault Avidance Measures Flw-Tek A Subsidary f Bray Internatinal, Inc has a defined prduct lifecycle prcess in place. This is dcumented in the Quality Management System Manual [D1] and varius Operating Prcedures [D5]. A dcumented mdificatin prcess is als cvered OP 7.3 in the Operating Prcedures [D5]. N sftware is part f the design and therefre any requirements specific frm IEC t sftware and sftware develpment d nt apply. The assessment investigated the cmpliance with IEC f the prcesses, prcedures and techniques as implemented fr prduct design and develpment. The investigatin was executed using subsets f the IEC requirements tailred t the SIL 3 wrk scpe f the develpment team. The defined prduct lifecycle prcess was mdified as a result f the audit which shwed sme areas fr imprvement. Hwever, given the simple nature f the safety functin and the extensive prven field experience fr existing prducts Flw-Tek was able t demnstrate that the bjectives f the standard have been met. The result f the assessment can be summarized by the fllwing bservatins: The audited Flw-Tek design and develpment prcess cmplies with the relevant managerial requirements f IEC SIL 3. T-023 V2R1, August, Page 10 f 15

11 5.2.1 Functinal Safety Management FSM Planning Flw-Tek has a defined prcess in place fr prduct design and develpment. Required activities are specified alng with review and apprval requirements. This is primarily dcumented in sectin 7 f their Quality System Manual [D1] and in greater detail in OP 7.3 f the Operating Prcedures [D5]. Templates and sample dcuments were reviews and fund t be sufficient. The mdificatin prcess is cvered by OP 7.3 f the Operating Prcedures [D5]. This prcess and the prcedures referenced therein fulfill the requirements f IEC with respect t functinal safety management fr a prduct with simple cmplexity and well defined safety functinality. Versin Cntrl Sectin & f the Quality System Manual [D1] specifies cntrl f dcuments and recrds at a high level. OP f the Operating Prcedures [D5] defines prcedures fr the cntrl f dcuments that are related t activities identified in the QMS such as the QMS manuals, frms, drawings, dcuments f external rigin and supply f dcuments t and frm ntified bdies pertaining t the PED requirements. Use f this t cntrl revisins was evident during the audit. Training, Cmpetency recrding Sectin f the QSM [D1] addresses Cmpetence, awareness and training at a high level. This is addressed in mre detail in OP 6.2 f the Operating Prcedures [D5]. It is the respnsibility f the department managers and supervisrs t establish the training needs f individuals. Jb descriptins and recrds f educatin, training and skills are maintained in the quality system files and in persnnel files. The prcedures and frms were examined and fund up-t-date and sufficient. Flw-Tek hired exida Cnsulting t be the independent assessr per IEC and t prvide specific IEC knwledge Safety Requirements Specificatin and Architecture Design Fr the Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves, the simple primary functinality f the valve is the same as the safety functinality f the prduct (t pen r clse in a specified time). A Safety Requirements Specificatin (SRS) was created fr the Fl-Tek Ball Valves. This SRS will serve as a guide fr impact analysis that may be assciated with future prduct mdificatins. As the Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves designs are simple and are based upn standard designs with extensive field histry, n semi-frmal methds are needed. General Design and testing methdlgy is dcumented and required as part f the design prcess. This meets SIL Hardware Design The design prcess is dcumented at a high level in Sectin 7 f the QSM [D1] and in greater detail n OP 7 f the Operating Prcedure [D5]. Items frm IEC , Table B.2 include bservance f guidelines and standards, (EU Directives, API, ASME, ASTM, & MSS) prject management, dcumentatin (design utputs are dcumented per quality prcedures), structured design, mdularizatin, use f well-tried cmpnents / materials, and cmputer-aided design tls (Pr/Engineer). This meets SIL 3. T-023 V2R1, August, Page 11 f 15

12 5.2.4 Validatin Validatin Testing is dcumented thrugh Wrk Instructin (WI) frms. WI-132 [D12] is a validatin test plan fr the F30 prttype. As the Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves are purely mechanical devices with a simple safety functin, there is n separate integratin testing necessary. The Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves perfrm nly 1 Safety Functin, which is extensively tested under varius cnditins during validatin testing. Items frm IEC , Table B.3 include functinal testing, prject management, dcumentatin, and black-bx testing (fr the cnsidered devices this is similar t functinal testing). Field experience and statistical testing via regressin testing are nt applicable. This meets SIL 3. Items frm IEC , Table B.5 included functinal testing and functinal testing under envirnmental cnditins, prject management, dcumentatin, failure analysis (analysis n prducts that failed), expanded functinal testing, black-bx testing, and fault insertin testing. This meets SIL Verificatin The develpment and verificatin activities are defined in Sectin f the QSM f [D1] and in greater detail in OP 7.3 f the Operating Prcedures [D5]. Fr each design phase the bjectives are stated, required input and utput dcuments and review activities. Pr/Engineer is used t verify design stresses as well as fit. This meets SIL Prven In Use In additin t the Design Fault avidance techniques listed abve, a Prven in Use evaluatin was carried ut n the Flw-Tek Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves during the surveillance activities in April Shipment recrds were used t determine that the actuatrs have >200 millin perating hurs and they have demnstrated a field failure rate less than the failure rates indicated in the FMEDA reprts. This meets the requirements fr Prven In Use fr SIL Mdificatins The mdificatin prcedure fr existing designs is described in sectin 3.0 f OP 7.3 [D5] Preparatin, Issue and Cntrl f Engineering Change Orders is described in sectin 5.0 f OP 7.3 [D5]. Engineering Revisin Ntices are cntrlled thrugh an ECO Lg system. All changes are first reviewed and analyzed fr impact befre being apprved. Measures t verify and validate the change are develped fllwing the nrmal design prcess. This meets SIL User dcumentatin Flw-Tek A Subsidary f Bray Internatinal, Inc creates the fllwing user dcumentatin: prduct catalgs and Installatin Maintenance Manuals. A sample f the F15 and F30 Series Manual [D2] is included in the SafetyCase. The Safety Manuals fr each valve series were fund t cntain all f the required infrmatin given the simplicity f the prducts. The Safety Manuals reference the FMEDA reprts which are available and cntain the required failure rates, failure mdes, useful life, and suggested prf test infrmatin. There was sme infrmatin in the Safety Manuals that require editing. The changes have been captured in the SafetyCase. T-023 V2R1, August, Page 12 f 15

13 Items frm IEC , Table B.4 include peratin and maintenance instructins, user friendliness, maintenance friendliness, prject management, dcumentatin, limited peratin pssibilities (Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves perfrm well-defined actins) and peratin nly by skilled peratrs (peratrs familiar with type f valve, althugh this is partly the respnsibility f the end-user). This meets SIL Hardware Assessment T evaluate the hardware design f the Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves a Failure Mdes, Effects, and Diagnstic Analysis was perfrmed by exida. This is dcumented in [R1]. An Failure Mdes and Effects Analysis (FMEA) is a systematic way t identify and evaluate the effects f different cmpnent failure mdes, t determine what culd eliminate r reduce the chance f failure, and t dcument the system in cnsideratin. An FMEDA (Failure Mde Effect and Diagnstic Analysis) is an FMEA extensin. It cmbines standard FMEA techniques with extensin t identify nline diagnstics techniques and the failure mdes relevant t safety instrumented system design. Frm the FMEDA, failure rates are derived fr each imprtant failure categry. All failure rate analysis results and useful life limitatins are listed in the FMEDA reprt [R1]. Tables in the FMEDA reprt list these failure rates fr the Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves under a variety f applicatins. The failure rates listed are valid fr the useful life f the devices. Nte, as the Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves are nly ne part f a (sub)system, the SFF shuld be calculated fr the entire final element cmbinatin. These results must be cnsidered in cmbinatin with PFD AVG values f ther devices f a Safety Instrumented Functin (SIF) in rder t determine suitability fr a specific Safety Integrity Level (SIL). The architectural cnstraints requirements f IEC , Table 2 als need t be evaluated fr each final element applicatin. It is the end users respnsibility t cnfirm this fr each particular applicatin and t include all cmpnents f the final element in the calculatins. The analysis shws that the design f the Flw-Tek 3-Piece Family Series 7/8000, Triad, S85, F15/F30 & RF15/RF30 Ball Valves can meet the hardware requirements f IEC 61508, SIL 3. The Hardware Fault Tlerance, PFD AVG, and Safe Failure Fractin requirements f IEC must be verified fr each specific design. T-023 V2R1, August, Page 13 f 15

14 6 Terms and Definitins Fault tlerance FIT FMEDA HFT Lw demand mde PFD AVG PVST SFF SIF SIL SIS Type A element Type B element Ability f a functinal unit t cntinue t perfrm a required functin in the presence f faults r errrs (IEC , 3.6.3) Failure In Time (1x10-9 failures per hur) Failure Mde Effect and Diagnstic Analysis Hardware Fault Tlerance Mde, where the demand interval fr peratin made n a safety-related system is greater than twice the prf test interval. Average Prbability f Failure n Demand Partial Valve Strke Test It is assumed that the Partial Strke Testing, when perfrmed, is autmatically perfrmed at least an rder f magnitude mre frequent than the prf test, therefre the test can be assumed an autmatic diagnstic. Because f the autmatic diagnstic assumptin the Partial Valve Strke Testing als has an impact n the Safe Failure Fractin. Safe Failure Fractin summarizes the fractin f failures, which lead t a safe state and the fractin f failures which will be detected by diagnstic measures and lead t a defined safety actin. Safety Instrumented Functin Safety Integrity Level Safety Instrumented System Implementatin f ne r mre Safety Instrumented Functins. A SIS is cmpsed f any cmbinatin f sensr(s), lgic slver(s), and final element(s). Nn-Cmplex element (using discrete cmpnents); fr details see f IEC Cmplex element (using cmplex cmpnents such as micr cntrllers r prgrammable lgic); fr details see f IEC T-023 V2R1, August, Page 14 f 15

15 7 Status f the Dcument 7.1 Liability exida prepares reprts based n methds advcated in Internatinal standards. exida accepts n liability whatsever fr the use f this reprt r fr the crrectness f the standards n which the general calculatin methds are based. 7.2 Releases Versin: V2 Revisin: R1 Versin Histry: V2,R1: Updates during surveillance audit, S. Clse, April V1, R1: Released t Flw-Tek A Subsidary f Bray Internatinal, Inc V0, R1: Draft; March 25, 2010 Authrs: Steven Clse Review: V2, R1: William Gble, exida, April 19, 2013 Release status: Released 7.3 Future Enhancements At request f client. 7.4 Release Signatures Steven F. Clse, Safety Engineer Dr. William M. Gble, Principal Partner T-023 V2R1, August, Page 15 f 15