COMPLETE SIL SOLUTION PUMPS, VALVES & ACTUATORS
EASY ACCESS TO SPARES
ion batteries for electric vehicles and have working collaborations with new technical battery programmes at Luleå University of Technology in north Sweden. Northvolt are working to create the “world’s greenest battery” and Rotork’s products will play a key role in their development. Northvolt Ett is a factory in Skellefteå, northern Sweden, that is due
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merson has introduced the first valve assemblies that meet the design process requirements of Safety Integrity Level (SIL) 3 per the International Electrotechnical Commission’s IEC 61508
standard. These Fisher Digital Isolation final element solutions serve the needs of customers for shutdown valves in critical safety instrumented system (SIS) applications. Without this solution, users must specify all the individual valve
components, procure each one, and assemble them into a working whole. Even if these steps are done correctly, this type of custom assembly will still not provide all the benefits of the Digital Isolation assembly. “We were excited to work with Emerson to accomplish the first
certified valve assembly,” said Loren Stewart, exida evaluating assessor for this project. “By providing a complete SIL solution for valve assemblies, Emerson is reducing unknown variables while helping ensure safety is always paramount.” Engineering a safety shutdown valve is a complicated task. The
normal and upset process conditions must be carefully evaluated and understood when choosing valve and actuator components. In addition, the proper combination of solenoids, brackets, couplings and other critical hardware must be specified and carefully matched to the selected valve. Each of these components must function individually and in concert to operate. Emerson addresses these and other issues by providing an
engineered Digital Isolation shutdown valve assembly, designed for each particular process. The various components are specifically selected to satisfy the application requirements. The entire assembly is sold as a fully tested and certified unit, with a single serial number and associated documentation delineating the details of every part of the assembly. Because the assembly is built as a complete solution in Emerson
facilities, it boasts an improved probability of failure on demand (PFD) rate. In some cases, the failure rate of the assembly will be up to 50% less than the combination of the same valve components purchased individually and assembled by an end user. This improved PFD results from the assembly being certified as a
whole system by exida, a leader in product certification and knowledge, to meet their rigorous Remote Actuated Valve Assembly requirements. By using this certified assembly, SIS designers may realise a substantial reduction in dangerous undetected failure rates (λDU). In one example, an Emerson customer was hoping to achieve a six-
year test interval for a SIL 2 safety interlock. When they performed a component SIL calculation on a standard shutdown valve, they could only achieve a SIL 1 level reliability at a six-year test interval. However, the Digital Isolation assembly exceeded SIL 2 requirements using the same components. This allowed the plant to safely extend their run time to six years, generating millions of dollars in additional revenue.
www.Emerson.com/en-us/automation/valves-actuators- regulators/control-valves/digital-isolation-solutions
30 NOVEMBER 2021 | PROCESS & CONTROL
to begin production in 2022. It will be Northvolt’s primary site for manufacturing, cell assembly and recycling. It will be powered entirely by clean energy, as part of their overall commitment to sustainability. Precise control of the processes involved is key. Rotork have currently provided 1250 valve actuators (RC200) to Northvolt Ett, working alongside valve supplier Onninen. It is anticipated that the total number of actuators supplied will top 1,400. The actuators will be operating valves on the battery production line. RC200 units are compact pneumatic actuators. They are available in both double- acting and spring-return configurations (both have been ordered for the Northvolt project), providing high start and end torque output. Additionally, 50 of Rotork’s YT-3700 digital smart positioners have
been ordered for the building’s water and heating systems. Northvolt chose Rotork’s RC200 actuators in part because they are
manufactured at Rotork’s site in Sweden (easy access to spares and service was considered desirable). A reputation of quality, specialised solutions and fast delivery to the Northvolt factory were also relevant factors in the choice. Northvolt needed fast control and fail-safe capability, both of which actuators within the RC200 range can supply.
www.rotork.com
INCREASING PROCESS RELIABILITY
process solenoid valve for gas and liquid applications, thereby increasing process reliability in production plants. In order to address
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customer requirements in a more specific way, the GEMÜ M75 pressure- compensated process solenoid valve is now available in a design for gas applications, as well as a design for liquid applications. Water hammers can therefore be clearly reduced, which increases product service life as well as plant reliability. Dynamic and static pressure forces are compensated for by the
innovative double bellows principle. As a result, the new valve with the very compact coil can be used for processes with an operating pressure of up to 6 bar. The fast operating times make the valve suitable for dosing steps in mixing technology, whether in the chemical industry, water treatment, washing and cleaning installations or electroplating. Thanks to a range of high-quality body materials (PP, PVC and PVDF)
and hermetic separation between the medium and the actuator using O-rings in various designs, the valve guarantees a reliable process sequence – including for corrosive media. The compact solenoid valve is suitable for nominal sizes DN 8 to 15 (and can be extended to DN 20 with an adapter) for open/close applications.
www.gemu-group.com
EMÜ is optimising the GEMÜ M75
otork products, including pneumatic actuators and digital smart positioners, have been ordered by a Swedish battery manufacturer. Northvolt specialise in the production of lithium-
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