pilz flyer phr en 2011-07
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Why did Pilz develop a new method
for assessing and evaluating risk?
Pilz spirit of continual improvement drives us
to evolve our services. We rely on the knowledge
of our global team of Machinery Safety Experts
and our quality reviews of thousands of successful
machinery safety projects to refine our services.
We contribute to and review new and emerging
standards including ISO 12100:2010 and
ANSI B11.0-2010 to define best practice in the
delivery of our services. Our experience is based
on our international presence in more than 40
countries and our participation in all important
standard committees.
In light of evolving standards and our pursuit of
continuous improvement, Pilz have further refined
the estimation and evaluation of risk. The result is
Pilz Hazard Rating (PHR).
Why is Risk Estimation important
in the Risk Assessment process?
Risk Assessment is fundamental to the achieve-
ment of safety through design of new machinery and
for selecting safeguarding and other risk reduction
measures on existing machinery. Risk estimation is
a critical step in the process. It enables risk from
identified hazards to be qualified and quantifiedin order to distinguish high-risk possibilities from
low-risk possibilities when considering machinery
safety. We in Pilz use a numerical rating system
which provides a relative score for the risk from
each hazard. Recently we have evolved and refined
our risk estimation methodology for prioritised risk
decision making.
What is PHR?
Pilz Hazard Rating is a newly designed system
for assigning a numerical estimate of risk based
on the formula:
PHR = DPH x PO x PA x FE
Where:
DPHrepresents Degree of Possible Harm
POrepresents Probability of Occurrence
PArepresents Possibility of Avoidance
FErepresents Frequency and/or
Duration of Exposure
Risk estimation is dependant upon the subjective
judgement of competent persons. Through our PHR
which is specifically tailored to assess machinery
safety we ensure consistent objective and practical
evaluation on factors including:
The severity of the potential consequence
defined by the degree of injury, the nature and
frequency of access to the hazard and the
duration of time in the danger zone
The probability of a hazardous event occurring
The possibility that a person can avoid the
hazard in certain specific conditions
Pilz Hazard Rating
Increasing the consistency and objectivity of
the analysis of your risk with Pilz Hazard Rating
Pilz GmbH & Co. KG, Felix-Wankel-Strae 2, 73760 Ostfildern, Germany 8-8-2-0-117, 2011-07Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: [email protected] Pilz GmbH & Co. KG, 2011
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Limits of the machinery
Hazard identification
Risk
related to the considered hazard
is a function of
Severityof the possible harm that can
result from the considered hazard
and
Probability of occurence
Risk estimation
Risk evaluation
Risk reduction
Yes
No
Machinery
safe?
End
Frequency and duration
of exposure
Probabilityof occurence of the event
Possibilityto avoid or limit
Key Risk From To
Negligible Risk 0,0046875 10
Very Low Risk 11 20
Low Risk 21 45
Significant Risk 46 160
High Risk 161 500
Very High Risk 501 9750
Benefits
Determine your risks with increased
objectivity and consistency to prioritise
risk reduction measures
Make decisions on safeguarding investments
effectively and transparently with Pilz Hazard
Rating
Follow best practice in Risk Assessments
using PHR, which is compliant with the latest
national and international standards
Profit from the Pilz spirit of continual
improvement and our endeavours to bring state
of the art Services to our customers
Determine the Performance Level or Safety
Integrity Level of your Safety Related Control
System based on the PHR parameters assigned
Pilz Hazard Rating
Risk Estimation
Risk assessment process with risk estimation.
Table above shows the description of risk for the range of PHR numbers in PHR system.
Pilz GmbH & Co. KG, Felix-Wankel-Strae 2, 73760 Ostfildern, Germany 8-8-2-0-117, 2011-07Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: [email protected] Pilz GmbH & Co. KG, 2011
Pilz Hazard Rating System
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