TopWorx™ D-ESD TopWorx™ D-ESD SIL-3 Rated Valve Controllers Automated “Partial Stroke Testing” of Emergency Shutdown Valves • Suitable for use in SIL-3 applications • Certified for use in all hazardous areas • Integrated solution with all controls in a single housing • Onboard diagnostics for performanc

SAFETY INSTRUMENTED SYSTEMS (SIS) Safety Instrumented Systems (SIS) are designed to protect employees, equipment, and the environment against the risks associated with the processing of toxic or flammable fluids. A Safety Instrumented System consists of: Logic Solver/PLC Logic Solver PLC that compares process conditions to predetermined process limits Sensors Level, temperature, pressure, and flow sensors to monitor process conditions Final Control Element Valve, actuator, and solenoid assembly to shutdown the supply of toxic or flammable fluids in case of an emergency Flow Pres Solenoid Valve...

Probability of Failure on Demand (PFD) There are three recognized techniques for determining Probability of Failure on Demand for a SIS. They are Simplified Calculation, Fault Tree Analysis, and Markov Analysis. Simplified Calculation is both the least complex and the most conservative: PFDavg = (Failure rate)2 * test interval Failure Rate = 1/MTBF (Mean Time Between Failure) The Safety Integrity Level (SIL) of the Safety Instrumented System (SIS) is obtained by adding the PFD value of each of the components in the SIS and then comparing the value to the figures in Table 3. PFDPLC + PFDSENSOR...

COMMON METHODS OF PARTIAL STROKE TESTING Partial Stroke Testing (PST) Since an Emergency Shutdown Valve is typically static in the full open position for long periods of time, it is necessary to test its functionality from time to time to prove its reliability and availability in accordance with its SIL rating. In the past it was necessary to fully close the valve during testing, requiring the plant to undergo a costly shutdown or install an expensive bypass valve. Now, however, modern-day “Partial Stroke Test” devices promise to eliminate those costs while simultaneously improving safety. During...

Common Partial Stroke Test Methods (con’t) The TopWorx Solution In effect, none of the conventional Partial Stroke Test devices that exist today deliver a high-value combination of functionality and price. Some have reasonable prices, but their functionality is too limited. Others have excellent functionality, but are too complex and excessively priced. Fortunately, TopWorx™ has created TopWorx™ D-ESD Valve Controllers - a low-cost, high-functionality partial stroke testing solution. The D-ESD hits the “sweet spot” of the market by combining the advantages of common partial stroke test devices...

TOPWORX D-ESD SIL-3 PARTIAL STROKE TEST SOLUTIONS TM TopWorx SIL-3 ESD Valve Controllers provide a complete Partial Stroke Test Solution with unique features and functionality that enable partial stroke testing of emergency shutdown valves without disrupting or shutting down the process. The TopWorx Partial Stroke Test Solution comes complete with: • Sensor Control Module to partially close the valve without disrupting the process • Pass/Fail indication via high/low response on the return signal • Open and Closed position sensors for feedback to the DCS or PLC • Onboard Diagnostics to enable...

Available in three platforms suitable for your particular application: DXP Tropicalized Aluminum Flameproof/Explosion Proof DXS 316 Stainless Steel Flameproof/Explosion Proof Capabilities • Suitable for use in SIL-3 applications • Certified for use in hazardous areas • Integrated solution with all controls in a single housing • Onboard diagnostics for performance validation

TOPWORX D-ESD TECHNICAL INFORMATION TM MINIMUM 2.25" (63.5) REQUIRED CLEARANCE IN ORDER TO DISENGAGE THE SHAFT FROM THE LID BUSHING AND REMOVE LID WHERE OPTIMUM CONDITIONS APPLY Once fitted to the valve and actuator and installed and powered up in the plant, the Partial Stroke Test position is set on the graduated cam to 10-20% from the fully open position. The unit is calibrated by pressing the push button provided on the Sensor Control Module and holding it for 5 seconds. During calibration a partial stroke test is automatically performed, recording the stroke time in the non-volatile memory....

Pilot Solenoid Valve Spool Valve (incl. Actuator) Partial Stroke Test (sensors & diagnostics ccts) Open Closed PS Position Magnets Fixed on Shaft Reed switches controlled by shaft magnets Error Codes Optional PST Switch (remote) Notes: The PST (sensors & diagnostics ccts) shaded box is the subject of the FMEA in Appendix 1 PLC DO is the (fail safe) control signal: Hi = ESD Valve Open Lo = ESD Valve Closed Solenoid Valve • Uses Standard Solenoid Valve Technology with flow rates of .86Cv, 3.7Cv - NO additional boosters or quick exhaust with piping required - NO continuous air bleed (positioner-type...

DXP-ES Tropicalized Aluminum DXS-ES 316 Stainless Steel Ordering Guide Fill in the boxes to create your ‘ordering number.’ Area Classification 1 Explosion proof / Flame proof (DXP/S only) North America Class I Div 1&2 Groups C, D; Class I Div 2 Groups A, B, C, D. (Groups A & B must be hermetically sealed) Type 4, 4X, ATEX/IECEx Zone 1 II2G, II2GD Ex d IIB+H2 Ex tb IIIC Db, IP66/67 (O-Rings must be S or E for DUST certification) G General Purpose C Flameproof; Conduit entries must be E or M ATEX/IECEx II2G, II2GD Ex d IIC Ex tb IIIC Db, IP66/67 W No approvals Type 4, 4x IP 66/68 Area Classification...

GLOBAL LEADER IN VALVE CONTROL AND POSITION SENSING Emerson™ is the global leader in valve control and position sensing for the process industries. TopWorx product solutions enable plants, platforms, and pipelines to manage and control operations more intelligently and efficiently under the most demanding and extreme conditions. GLOBAL TECHNOLOGY LEADERSHIP TopWorx™ technology advancements are at the forefront of innovation in the process automation industry. TopWorx™ uses wireless technologies and fieldbus protocols such as FOUNDATION Fieldbus, DeviceNet, AS-Interface, Profibus, and HART to...