Emerson launches emergency shutdown valve control system07 January 2021

​Emerson’s ASCO 141 series Advanced Redundant Control System (ARCS) is said to provide a redundant solution for a variety of emergency shutdown valve applications, such as those found in the chemical, power, oil and gas industries.

The ASCO 141 series ARCS is designed for use as a component in safety instrumented systems. Utilizing 1oo2, 2oo2 or 2oo3 voting solenoids to enhance the reliability of the circuit, it functions as a redundant pneumatics tripping device to control the pilot air signal to a process valve actuator. The ARCS features either two or four electrically-actuated solenoid valves, visual indicators and a manually-controlled bypass or isolation valve.

According to Emerson, its control functionality allows for maintenance of the solenoid valves without having to shut down the process valve. In fact, the use of the maintenance bypass or isolation valve is not required for functional testing of the ARCS unit — a downtime-reducing feature not possible with common bypass functions. The supplier says that ARCS is the only safety system in the industry to offer this feature.

“By addressing the concerns common with typical bypass systems — particularly those in critical or emergency shutdown applications — our ASCO 141 series ARCS provides a reliable, time-saving alternative,” said vice president of global marketing for Emerson’s industrial automation business, Erik VanLaningham.

“Although the use of a common bypass is a typical solution, the end-user doesn’t know if they’ll be able to shut down on demand in the event of an emergency because their redundant system is in bypass mode. This is where our unique ARCS value proposition comes in. The ARCS individual valve isolation option provides increased safety and operational availability during online maintenance to help customers achieve their required SIL rating.”

The ASCO 141 series is supplied as a fully integrated, comprehensive solution using a manifold instead of individual valves. The system also features a status indicator that provides digital input feedback (via pressure switches or Emerson’s proprietary GO Switch options) to the control room.

Operations Engineer

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