Chemical Engineering August 2022 - 43

tem must be equal to or higher than
the required performance level. Performance
levels range from a to e,
and the Performance Level Requirement
(PLr) is based on three parameters:
severity of injury, frequency
and/or exposure to hazard, and possibility
to avoid hazard or limit harm.
With this global chemical manufacFIGURE
2. Machinery safety prioritization is often
the first activity in the risk assessment process. It
helps plants to determine which pieces of machinery
are in most critical need of safety upgrades
of a safety concept or a functionalsafety
design of the control systems,
as well as engineering the design of
the suitable protective measures.
The safety standard level that the
corporation required was identified
as Performance Level d (PLd).
A performance level is a value used
to define the ability of safety-related
parts of control systems to perform
a safety function under foreseeable
conditions. The required performance
level is used to achieve the required
risk reduction for each safety
function. The performance level of
safety-related parts of a control sysOptimize
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turer, the ISO EN13849-1 standard
(see Table 1) was referenced to determine
the necessary performance
level to reduce risk on machinery in
its facility. The company determined
that PLd was the best option for
its processes. In some cases, this
performance level is higher than required,
but the company believed
that setting this requirement at PLd
would provide a distinct advantage to
protecting its employees while meeting
the core values of the company.
The next step involved determining
the most efficient, optimal way to
incorporate a compliant safety solution
into the company's complex applications.
Safety is vitally important,
but it is also critical to not unnecessarily
hinder processes, productivity
FIGURE 3. Plants may include a blend of generalpurpose
and customized components, so companies
must seek differentiated solutions to establish
an overarching safety plan
and uptime.
Many of the control components
and devices at the manufacturer's
facilities are general-purpose, and
therefore must be tailored for use
in a Class 1, Div. 2 environment (for
instance, installed into a purged
cabinet or an explosion-proof enclosure).
Other times, areas of the facility
were unclassified to install certain
components. Applying the correct
products to meet the appropriate
standards was critical, especially
for a global organization with similar
machines located in different facilities
all over the world.
Pfeiffer Vacuum GmbH
Germany
T +49 6441 802-0
CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM
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AUGUST 2022
www.pfeiffer-vacuum.com
43
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August 22 - 26, 2022
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Chemical Engineering August 2022

Table of Contents for the Digital Edition of Chemical Engineering August 2022
