Chemical Engineering January 2016 - 54

Engineering Practice
Illuminating Process Vessels:
Advantages of Diffused Light
Don't panic - What appear to be scratches on a vessel may be an illusion caused by
improperly applied LED lighting
David Star, Aarash Navabi and
Mathew Hildner
L.J. Star
I
magine looking into a sight glass
for a routine tank inspection, and
seeing for the first time numerous
scratches and potential points
of contamination. What could have
happened?
As more operators switch to
light-emitting diode (LED) lighting to
illuminate the interior surfaces of
process vessels, many are often
alarmed by the sudden appearance
of scratches that appear on
the vessel walls. In most cases,
these are " false positives " caused
by improper application of LED
lighting. This article discusses the
science behind this phenomenon,
and provides guidance on how
to properly apply LED lighting
to gain a more accurate view of
your processes.
Lighting choices
Many pharmaceutical and biotech
companies are switching to LED
lighting in their process operations,
either as part of a company's environmentally
friendly initiatives, or because
of other advantages of LED
lighting technology. In general, LED
lights bring a variety of advantages.
For instance, they have a far longer
service life than traditional halogen
bulbs, which reduces labor costs.
LED lights can also be brighter, and
their " color temperature " can be
selected for optimal illumination of
the process.
Unlike incandescent lights, LEDs
emit very little heat compared to infrared
light, which means they do not
add heat to a process or environment.
Finally, LED lights can be
computer-controlled, which allows
for dimming control.
54
FIGURE 1. A light diffuser may be incorporated into the lens of a sight glass light (Source: L.J. Star)
However, LED lights will not be
successful in an application unless
they can provide an accurate view of
the process. In order to prevent the
appearance of insignificantly small
scratches and surface features, LED
lights used to illuminate process vessels
should incorporate a diffuser in
the lens.
A diffuser is a device that scatters
light. They are commonly made
out of translucent objects such
as ground glass, Teflon or opal.
Diffusers are a simple, affordable
solution that can be specified at the
time of sight-glass light selection
(Figure 1).
For many pharmaceutical proChemiCal
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Chemical Engineering January 2016

Table of Contents for the Digital Edition of Chemical Engineering January 2016

Contents
Chemical Engineering January 2016 - Cover1
Chemical Engineering January 2016 - Cover2
Chemical Engineering January 2016 - Contents
Chemical Engineering January 2016 - 2
Chemical Engineering January 2016 - 3
Chemical Engineering January 2016 - 4
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Chemical Engineering January 2016 - Cover3
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