Factory-tested safety enclosure system for ESDs
An
Asco Numatics product story
Edited by the Engineeringtalk editorial team
Dec 25, 2001
Asco Joucomatic's new 2oo2D-SOV safety enclosure system is designed as a key component to provide added levels of operating safety in emergency shutdown systems such as flaring systems on stack pipes
Asco Joucomatic's new 2oo2D-SOV safety enclosure system is designed as a key component to provide added levels of operating safety in emergency shutdown systems (ESD) and other critical applications in water treatment, pharmaceutical and petrochemical industries - typically flaring systems on stack pipes.
The 2oo2D-SOV is a factory assembled and factory tested enclosure, designed to ensure complete functional reliability and the reduction of spurious tripping in the most critical of process applications.
The unit comprises a stainless steel or powder coated steel enclosure, housing ISO-2 solenoid valve assemblies.
The valve assemblies provide the end user with either redundant control "2oo2" (two out of two) protection, or single solenoid with a Hot Back-up "1oo1" (one out of one) standby.
Optimising the operation of the solenoid valves are three pressure switches, which constantly monitor the solenoid valve position and provide diagnostics information.
When configured in 2oo2D-SOV mode, the safety system functions as a redundant actuating device to control air to process valves.
In this operation the "two-out-of-two" voting offers high levels of safety protection as both solenoids must be de-energized to trip the system.
In redundant mode the operation of the 2oo2-SOV is optimised with a PLC, which is used to perform diagnostics and periodic on-line testing to assure high availability.
The alternative arrangement, 1oo1 HS SOV - or "Hot Standby Valve system, is a dual configuration solenoid operated device designed for safety instrumented systems.
With this system, one solenoid valve is always energized while the second solenoid valve remains on standby, only coming online in the event of a failure of the first solenoid.
Both solenoids must be de-energized to trip the system.
Here too, a PLC is required to perform diagnostics and periodic on-line testing to assure high availability.
A key feature of both 2oo2 and 1oo1 systems is a By-pass mode that permits the user to service the device without taking the process valves off line.
In addition, when a PLC is applied, functions such as "Automatic on-line testing" and "Partial stroke testing" of the process valves can also be achieved.
The 2oo2D-SOV is configured for easy installation and mounting using four mounting brackets provided on the enclosure corners.
It operates on dry air filtered to 50 microns in the ambient temperature range -28oC to 60oC.
The 2oo2D-SOV is a patent pending design, production versions of which will be available to the UK process market from January of next year.
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