SIL-capable AUMA actuators meet the highest safety requirements as part of a safety system for flue gas scrubbers on a BASF incineration plant in Ludwigshafen, Germany. The actuators operate flue gas dampers that protect the GRP scrubbers against excessive temperatures in case of emergency.
To prevent damage to the scrubbing system BASF implemented a protection scheme that, as an overall system, meets the stringent SIL 3 requirements according to IEC 61508. The system includes three flue gas dampers fitted with AUMA electric actuators that are TÜV-certified for use in safety-related systems up to SIL 2/SIL 3 (SIL 3 for redundant system architecture).
The first flue gas damper is installed upstream of the flue gas scrubber. If inadmissibly high temperatures are detected, the actuator closes the damper to stop flue gas entering the scrubber. The other two actuators open dampers that divert the flue gas to an emergency stack. For maximum safety, these dampers are arranged in series in a 2oo2 (two out of two) configuration.
The actuators are controlled by a safety PLC that issues a signal to the ESD (emergency shutdown) input of each actuator whenever there is demand for a safety operation. To ensure maximum system availability an uninterruptible power supply (UPS) provides emergency power for the electric actuators. Each actuator automatically performs a partial valve stroke test (PVST) once a month to ensure that actuators and dampers are working correctly.
For several years now, functional safety and SIL have been a priority for AUMA as one of the world’s leading manufacturers of electric actuators. The company offers an extensive product portfolio covering safety requirements up to SIL 3.
Flood-Proof submersible actuator helps wastewater treatment
Emerson today launched its EIM™ Aquanaught, a waterproof submersible electric actuator, designed to meet critical isolation demands on wastewater treatment plants during high water conditions. The actuator can be submerged and still operate under 150 feet of dirty water for seven days, which is three times deeper and 40 percent longer than competing submersible technologies.
The Aquanaught features a robust mechanical design with a waterproof enclosure and hermetically sealed connections that ensure uninterrupted plant operation during flooding conditions. Ideal for gate or valve isolation applications found in wastewater, water, collection systems, hydropower, flood control and desalination plants, the design allows these facilities to remain in control of their isolation needs from a safe remote location even if the actuator becomes submerged for extended periods of time. Waterproof sensors provide an additional level of protection by enabling early diagnostic and preventive maintenance during the flooding event.
According to the Environmental Protection Agency (EPA), the US processes approximately 34 billion gallons of wastewater every day. During events like Hurricanes Sandy, Irma and Harvey, billions of gallons of untreated sewer overflowed into impacted communities, posing significant health and environmental risks to the affected areas. With experts predicting that flooding is expected to worsen as climate change progresses, the need for more reliable actuation technologies becomes critical for these facilities.
“When flood waters begin to overwhelm wastewater treatment facilities, it becomes critical for these plants to keep pace with the changing conditions and continue to operate for the sake of their communities,” said Shimona Verma, senior product marketing manager for actuation technologies at Emerson Automation Solutions. “More facilities are looking to upgrade their infrastructure to ensure they aren’t outmatched by future flood waters, and the EIM Aquanaught is a reliable component that will help their operations stay afloat.”
SMC merges its digital pressure switch range in 2018 under the same design
SMC is building on the success of its ZSE20(F)/ISE20 pressure switch range that features 3-
screen display, 3-step setting mode and selectable delay time function, with the ZSE20(F)#/ISE20# (A, B and C). The extended series will help operators deliver efficiencies in terms of control and time saving.
SMC is kickstarting 2018 by extending its ZSE20(F)/ISE20 digital switch range. The A, B and C variations share the original ZSE20(F)/ISE20’s display, setting, selectable delay time, as well as the lightweight and compact design. All models simplify the visualisation process for operators, while saving time as there are fewer push button operations to perform.
The added variations also match the terms of enclosure, output type and media of the current series:
– A Model-> Current ZSE30(F)/ISE30A-> IP40, NPN/PNP and Analogue output
– B Model-> Current ZSE40(F)/ISE40A-> IP65, NPN/PNP and Analogue output
– C Model-> Current ZSE80(F)/ISE80-> IP65, NPN/PNP and Analogue output, for fluids.
A spokesperson from SMC, the world’s leading expert in pneumatics, said: “Following the
success of our ZSE20(F)/ISE20 pressure switch last year, we have taken the step to extend the range with these latest models. Customers have been particularly impressed with the functionality of design, its ease of use and accuracy of information that is readily available with minimal delay. They have found it both energy efficient and cost effective to operate.”
Further flexibility and advantages of the ZSE20(F)#/ISE20# include the peak and bottom values are maintained, even if the power supply is cut, offering greater control in the process.
Also, being compact and lightweight, the models not only deliver space savings, but due to the weight reduction there are less inert moments when the sensor is mounted in mobile applications such as robotic arms.
New explosion-proof electric actuators for continuous underwater use
AUMA has enhanced its underwater actuators with explosion-proof versions. These actuators are suitable for continuous immersion, thus considerably extending the scope of application of electric actuators in water supply systems, hydropower plants, civil engineering constructions for water applications, and specific underwater applications.
Where water supply or sewer pipes run underground, actuators and valves are often installed in pits below ground level. Actuators designed for underwater use are ideal for installation in monsoon regions or in areas with a high risk of flooding as they will operate reliably even if flooding persists. The new explosion-proof version is available for sewers and sewage pits, where fermentation gases generate a risk of potentially explosive atmospheres during dry periods.
Thanks to a universal sealing system combined with comprehensive corrosion protection these actuators can reliably operate under water for many years. Double-sealed cable glands at the electrical connection, inner seals – some in pairs – on all housing covers, and a one-piece solid shaft effectively prevent the ingress of water.
SA and SAEx actuators in sizes 07.2 to 16.2 for continuous underwater use are qualified for up to 15 m head of water, with higher heads of water available on request. Explosion-proof versions meet ATEX requirements.
All actuator settings, including end position settings for travel and torque, are made non-intrusively via the AC actuator controls, without opening the actuator housing. The actuator controls are installed outside the flooded area, separate from the valve and actuator, and connected via cables. Cable lengths up to 100 m can be achieved.
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