Emerson Fisher 377 Instruction Manual
2015-03-30
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Instruction Manual Supplement 377 Trip Valve D103775X012 August 2013 Safety manual for Fisher® 377 Trip Valve for Safety Instrumented System (SIS) Solutions When the Fisher 377 trip valve is used in a Safety Instrumented System (SIS) the design process should follow a safety lifecycle as described in several international standards (IEC61508, ANSI/ISA 84.01, etc.) The following must be thoroughly reviewed and implemented as part of the safety lifecycle. This is in addition to regular installation procedures and warnings listed in the latest version of the Fisher 377 trip valve instruction manual (D200319X012). WARNING This instruction manual supplement is not intended to be used as a standalone document. It must be used in conjunction with the following manual: Fisher 377 Trip Valve Instruction Manual (D200319X012). Failure to use this instruction manual supplement in conjunction with above referenced manual could result in personal injury or property damage. If you have any questions regarding these instructions or need assistance in obtaining this document, contact your Emerson Process Management sale office. A. Definitions, Acronyms and Abbreviations 1. FIT Failure In Time (1x109 failures per hour) 2. FMEDA Failure Modes, Effects, and Diagnostics Analysis 3. Low Demand Mode Mode, where the demand interval for operation mode on a safetyrelated system is greater than twice the proof test interval. 4. PFDAVG average Probability of Failure on Demand 5. PVST Partial Valve Stroke Test 6. SIF Safety Instrumented Function 7. SIL Safety Integrity Level 8. SIS Safety Instrumented System B. Related Literature 1. D200319X012 Fisher 377 Trip Valve (Instruction Manual) 2. Exida FMEDA Report for Fisher 377 Trip Valve Report no. EPM 11/08109 R001 C. Product/ System Properties 1. The product is for control applications where a specific valve/ actuator action is required when supply pressure falls below a specific point. When the supply pressure rises above the trip point, the 377 trip valve automatically resets, allowing the system to return to normal operation. 2. The failsafe state for the 377 trip valve is to move the associated actuator to fail up, lock in the last position, or fail down when the supply pressure falls below the trip point. www.Fisher.com Instruction Manual Supplement 377 Trip Valve D103775X012 August 2013 3. The 377 trip valve is a Type A device having a hardware fault tolerance of 0 (HFT = 0). The 377 trip valve is limited to a Low Demand Mode of the SIS applications. 4. The 377 trip valve is suitable for use in application to a maximum Safety Integrity Level of 3 (SIL3). 5. The failure rates for the 377 trip valve are listed below. Consult the exida FMEDA report no. EPM11/08109 R001, available from your Emerson Process Management sales office, for a detailed list of the assumptions used in the analysis. Failure Category Fail Safe Detected Fail Safe Undetected Fail Dangerous Detected Failure Rate (FIT) 377D & U 377L 0 0 239 217 0 0 Fail Dangerous Undetected 379 387 No Effect 603 618 6. Safety Instrumented Function (SIF) design verification must be done for all components in the SIF including the 377 trip valve. The SIF must fulfill the requirements according to the Safety Integrity Level (SIL). Each subsystem must be checked to assure compliance with minimum hardware fault tolerance (HFT) requirements. 7. When using a 377 trip valve in a redundant configuration, a common cause factor of at least 5% should be included in safety integrity calculations. D. Installation/ Configuration/ Commissioning 1. The 377 trip valve complies with the requirements of ATEX Group II Category 2 Gas and Dust. 2. The ambient temperature capabilities can be 40 to 82_C (40 to 180_F) and 18 to 104_C (0 to 220_F) depending on the elastomeric material selection per 377 instruction manual. 3. The supply pressure will be within 3.8 to 10.3 bar (55 to 150 psig). The supply medium must be clean, dry air that meets the requirements of ISA 7.0.01. A maximum 40 micrometer particle size in the air system is acceptable. 4. The 377 trip valve can be topmounted on a manifold, yokemounted, or bracketmounted to match the application requirements. 377 trip valves are used with all types of piston actuators. 5. A supply regulator, if used, must have a flow capacity greater than the required combined capacity of the trip valve and actuator. A regulator with insufficient capacity may allow supply pressure to droop, which can cause the trip valve to trip again and begin a tripreset cycle. 6. The safety function of the SIF must be tested after installation. E. Operations, Maintenance and Decommissioning 1. Personnel operating the 377 trip valve and performing maintenance must be competent to do so. 2. Use lockout procedures and select the appropriate maintenance procedures as defined in instruction manual. 3. A conservative approach is taken in estimating the service interval for the 377 trip valve in Safety Instrumented System. For SIS applications, preventive maintenance must be performed on the 377 trip valve at ten year intervals from the date of shipment. If the instrument is exposed to the upper or lower extremes of the environmental limits, the interval for the preventative maintenance may need to be reduced. 4. If air leakage from the 377 trip valve is detected when at steadystate conditions, take immediate corrective action by replacing the 377 trip valve. It is to maintain the intended actuator fail mode upon loss of supply pressure. To ensure continuous improvement and accurate reliability prediction, the user must also work with their local Emerson Process Management service representative to see that all failures are reported. 2 Instruction Manual Supplement D103775X012 377 Trip Valve August 2013 F. Periodic Inspection, Test and Repair Periodic proof testing is an effective way to reduce the PFDavg of the 377 trip valve as well as the valve and actuator it is connected to. Results of periodic inspections and tests should be recorded and reviewed. WARNING To avoid personal injury or property damage appropriate measures must be taken to ensure the safety of the process any time the SIF needs to be disabled, such as to perform a proof test or to take corrective actions. 1. Bypass the safety function and take appropriate action to avoid a false trip. 2. Interrupt or change the process signal to the 377 trip valve to force the associated actuator and valve to the failsafe state and confirm that the safe state was achieved and within the correct time. 3. Restore the process signal to the 377 trip valve and inspect the 377 trip valve for any leaks, visible damage or contamination and confirm that the normal operating state was achieved. 4. Remove the bypass and otherwise restore normal operation. 5. For the test to be effective the movement of the valve must be confirmed. To confirm the effectiveness of the test both the travel of the valve and slew rate must be monitored and compared to expected results to validate the testing. To ensure corrective action, continuous improvement, and accurate reliability prediction, the user must also work with their local Emerson Process Management service representative to see that all failures are reported. 3 377 Trip Valve August 2013 Instruction Manual Supplement D103775X012 Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product. 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 Process Management business unit of Emerson Electric Co. Emerson Process Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners. The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by our terms and conditions, 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. Emerson Process Management Marshalltown, Iowa 50158 USA Sorocaba, 18087 Brazil Chatham, Kent ME4 4QZ UK Dubai, United Arab Emirates Singapore 128461 Singapore www.Fisher.com 4E 2013 Fisher Controls International LLC. All rights reserved.
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