Doug et al,
Risk assessment methodology exploded in the (60s and 70s) early
days of the aerospace program as there were a myriad of new problems coming out
of this bleeding edge technology being implemented.
Willie Hammer’s classic training manual covered all of the
methodologies; he gave a presentation to our professional staff in the 1980s.
It all seemed to be more invasive than we were wanting to go in those days; we
depended upon the standards developers to assess the risks and provide adequate
provisions in the safety standards to cover them.
Working with machinery later opened the doors to diving deeper
into the hazards and risks associated. Risk assessment became a routine
process and a well oiled process was introduced to get design teams to quickly
evaluate them and rank them; I have my own procedure and worksheets for this.
Yes, there are options as to the details of the methods used; these are being
refined and consolidated with time.
More recently I worked with a clever engineer on a project for
which he developed a comprehensive spreadsheet which collected the risk
assessment inputs and quickly developed any of a number of ‘standardized risk
reports’. It is proprietary today; perhaps is will be publicly discussed
and/or made available in the future.
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety & Regulatory Affairs Consultant
PO Box 1067
Albany, ORe 97321-0413
503/452-1201
IEEE Life Fellow
IEEE PSES 2020 Distinguished Lecturer
<mailto:[email protected]> [email protected]
Entropy ain’t what it used to be
From: Ruth Shapira <[email protected]>
Sent: Wednesday, June 17, 2020 1:48 AM
To: [email protected]
Subject: Re: [PSES] Risk Assessment question
Hi Douglas,
A list of Risk Management and Functional Safety Standards you can find in
pag.124 of the book “Electrical Product Compliance and Safety Engineering”
published at Artech House in 2017.
Also an analysis of RM and Methods for Failure Analysis is presented on the
same book in Chapters 6 and 5.
I hope that above info can help you.
Best Regards and be safe,
Steli
Steli Loznen, M.Sc., SM-IEEE
VP for Technical Activities and Member of BoG IEEE-PSES
Convener IEC 62A/MT29+MT 62354
17-3 Shaul HaMelech Blvd.
Tel Aviv 6436719
Israel
Tel:+972-3-6912668
Fax:+972-3-6913988
Mobile:+972-54-4818816
e-mail: [email protected] <mailto:[email protected]>
From: Douglas Powell <[email protected] <mailto:[email protected]> >
Sent: Wednesday, June 17, 2020 1:49 AM
To: [email protected] <mailto:[email protected]>
Subject: [PSES] Risk Assessment question
All,
Over the past several years, nearly all safety standards have incorporated Risk
Assessment (RA) as a part of their requirements. I did an informal search and
found that the assessment methods are used in a wide range of disciplines from
electrical products to machinery, robotics, safety software controls, medical
equipment, medical procedures, automotive, aerospace, traffic control and even
tree removal in municipalities. It is very clear that safety professionals
worldwide really do like this method and I think it lends a certain comfort to
a safety engineer's angst in marginal situations. I probably shouldn't say it
but in my personal opinion this is a huge CYA exercise (cover your anatomy) for
all involved.
Usually the product RA goes before construction review, testing and
certification. It is often used to identify areas not covered well by the body
of the standard and where additional testing may be required. Virtually all
standards describing the use of RA mention the scheme found in FMEA/FMECA of
identifying a tasks, operations, or events and assigning numerical values to
the parameters of interest, followed by the product of these values to identify
level of risk. Commonly these parameters are severity, frequency of exposure,
and possibility of avoidance. Today the use of FMEA goes far beyond design,
manufacturing, and processes.
Often times, a particular standard will say something like "documents that can
be used as guidance for the safety analysis include..." followed by a short
list of standards from IEC, EN, ISO, ANSI, MIL STD and so on. Notable to me is
the use of the word "can" or "may" which implies the user has some leeway in
selecting which document they prefer. Additionally, further guidance is often
given for "active" protection devices and software/firmware controls for safety
function (i.e. safety integrity levels and performance levels). Once again,
using the methodology of FMEA as a way of assigning risk levels.
So after all that, here is my question. Given wide-ranging product types and
use models, the long list of risk assessment standards, has anyone produced a
comprehensive list or matrix correlating products to applicable standards? I
believe a list such as this would be very helpful.
Stay safe and stay frosty all,
Doug
--
Douglas E Powell
Laporte, Colorado USA
[email protected] <mailto:[email protected]>
http://www.linkedin.com/in/dougp01
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