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ANSI B11.TR3A TECHNICAL REPORT ON
RISK ASSESSMENT ANDREDUCTION
An Overview by
Robert N. Andres, CSP, CMfgE
Chairman, ANSI B11.TR3
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A PARADIGM SHIFT
The most significant step forward in the
field of safety in the past thirty years- Fred Manuele, Author
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Observations and Concerns
that started it all ...
Hazard control without risk estimation
is unrealistic and out of step with the
rest of the world
Many machine hazards are beingmissed because task identification is
not a part of the process
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Objectives
To harmonize, insomuch as is feasible,with European and other internationalstandards.
To offer guidelines for B11 standardssub-committees in the methodology ofrisk assessment and reduction - forinclusion into various B11 standards.
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Objectives
Establish a methodology fordetermining levels of riskand provide
guidelines for selection ofappropriatesafeguards for the desired degree ofrisk reduction
Be specifically written for machinetools (although applicable to a widerange of industrial machinery)
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Guiding Principles ...
Simple and easy to use at all levels.
Applicable to both suppliers and usersand encouraging synergism.
Essentially harmonized with EuropeanStandards.
Providing a consistent method of riskestimation based upon clear criteria
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How it differs from EN1050
It provides guidance to both the
machine designer (manufacturer) and
the user.
It defines levels of risk, and gives an
example of a risk determination model.
It provides information to aid in the
selection of appropriate safeguards.
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WHAT IT SAYS
Hazards and their effects can best beidentified by analyzing tasks
Hazards can be classified by the worstcredible injury that may occur from ahazardous event
Risk is determined by estimating theseverity of the hazardand the
probability of occurrence of a
hazardous event
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WHAT IT SAYS
Zero Risk Does Not Practically
Exist!
The goal is to reduce risk to a tolerable
level fully communicating any
residual risk to the user.
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An overview of the steps in Task-
Based Risk Assessment and Reduction
1 - Determine the limits of the machine2 - Determine the tasks to be performed
over the life-cycle of the machine
3 - Identify the hazards associated with
these tasks and rate their severity
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An overview of the steps in Task-
Based Risk Assessment and Reduction
4 - For each hazard, establish theprobability of a hazardous event
5 - Determine the level of risk. If it is not
tolerable - continue ...
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An overview of the steps in Task-
Based Risk Assessment and Reduction
6 - Eliminate the hazard or reduce its
severity. (lessen energy or toxicity)7 - Determine the appropriate type and
minimum required level of
performance of protective(safeguarding) measures to providethe desired degree of risk reduction,
using the Safety Hierarchy as a guide.
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THE FUTURE is here
DOCUMENT RELEASE DATE
DECEMBER 2000
Order Your Copy FromThe Association for Manufacturing Technology
1-800-524-0475
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This presentation is intended only
to introduce the basic content ofthe subject document.
ANSI B11.TR3 is copyrighted byAMT, the Association for
Manufacturing Technology,
7901 Westpark Drive, McLean
VA 22102-4269
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Provided as a service to the Safety
Community by
THE INTERNATIONAL ASSOCIATION OFPRACTICING SAFETY ENGINEERS
www.iapse.org [email protected]
http://www.iapse.org/http://www.iapse.org/