Location: United States
Customer: Chemical manufacturer
Case study
Requirement
A chemical manufacturer needed a
reliable air control valve unit for their safety
instrumented system (SIS) to monitor and
deliver pneumatic directional control to
process valves. They also required a simple
component that could be installed in close
proximity to the process valve it controls
and a system with safe access should
repairs be needed. Existing panel designs
were complicated and, due to their size,
often required remote installation, creating
confusion for plant operators and increasing
the risk of error. In summary, the customer
required a control unit that was robust,
simple to read and easy to service.
Solution
Norgren (now IMI Precision Engineering)
was already supplying robust valves that
meet ANSI 84 and IEC 61 508 safety
integrity level (SIL) standards. To meet this
specifi c requirement, engineers designed
a simplifi ed valve manifold with two SIL
valves in redundant mode and an SIL-rated
bypass valve with a lockout feature. This
IMI Norgren redundant valve manifold has
four visual indicators that make it easy for
the operator to see that the unit is working
properly or, if not, where the problem
lies. Should a malfunction be detected,
the operator can fi x the problem without
impacting the system: the bypass valve
enables safe servicing while the process
continues.
Sector image used under license
from Shutterstock.com
© Norgren, Inc. 2015
Redundant valve manifold helps
chemical plant meet SIL standards
Engineering
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