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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 info@iapse.org

http://www.iapse.org/http://www.iapse.org/