Chemical Engineering January 2017 - 35

Part 2
What's Corroding Your
Control Room?
Corrosion-induced failures are frequent in the electronics products used in control rooms, but
proper environmental assessment, control and monitoring can help abate these concerns
Chris Muller
Purafil, Inc.
IN BRIEF
CAUSES OF CORROSION
CONTAMINATION
CONTROL PROCESS
ROHS AND RELIABILITY
LOOKING FORWARD
FIGURE 1. The critical electronic components in CPI control rooms are susceptible to corrosion, and protection mechanisms
should be put into place to prevent failure.
E
lectronic process-control equipment
- from small remote sensors
and instruments to plant-wide
distributed control systems (DCS)
- make plants in the chemical process
industries (CPI) capable of higher production
rates, and keep them more competitive
in the world market (Figure 1). Chemical,
physical and environmental monitoring and
control of processes, which previously was
performed manually or through simple control
systems, is now accomplished in realtime
via sensors and actuators linked by a
sophisticated DCS. This type of high-speed
network enables manufacturers to produce
goods economically at high rates and with
high quality.
The key to proper control is a properly
functioning DCS. This ensures correct sensor
function, communications and process
control. The corrosive gases that are present
in many industrial facilities will permeate
into control rooms, DCS spaces and
computer facilities, and will most likely degrade
and eventually incapacitate critical
electronic equipment. This scenario may,
in many cases, lead to catastrophic failure
in critical control and safety systems. The
environment must be properly managed for
safe and successful system operation and
reliability. This article covers the ways environmental
assessment, monitoring and
control can be applied to avoid corrosion
issues in control rooms.
To begin with, plant operators must manage
several environmental species of airborne
contamination, including the following:
* Liquids, including small levels of condenCHEMICAL
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Chemical Engineering January 2017

Table of Contents for the Digital Edition of Chemical Engineering January 2017

Contents
Chemical Engineering January 2017 - Cover1
Chemical Engineering January 2017 - Cover2
Chemical Engineering January 2017 - Contents
Chemical Engineering January 2017 - 2
Chemical Engineering January 2017 - 3
Chemical Engineering January 2017 - 4
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