Machine safety: Incorporating functional safety, part 2

When considering “functional safety,” look at what differs compared to other safety initiatives, consider U.S. versus international standards, examine conformance responsibilities, and think about what changes are needed, if any, as a manufacturer. Part 2 of 4 looks at U.S. vs. international safety.

03/22/2013


When considering “functional safety,” look at what differs compared to other safety initiatives, consider U.S. versus international standards, examine conformance responsibilities, and think about what changes are needed, if any, as a manufacturer.

1. What is so different about “functional safety”? (Part 1)

2. Are U.S. domestic standards adopting functional safety requirements from the international standards?

3. Do the international standards place primary conformance responsibility on manufacturers like with OSHA?

4. Do we have to change our machine safety program as a manufacturer in order to meet the compliance requirements?

Let’s take a look at these four questions addressing the second question in Part 2.

 

Definition from IEC 61508-1 - Functional safety is “part of the overall safety relating to the equipment under control and the equipment under control’s control system which depends on the correct functioning of the Electrical/Electronic/Programmable Electronic safety-related systems, other technology safety-related systems and external risk reduction facilities”.

 

Are U.S. domestic standards adopting functional safety requirements from the international standards?

Who has an answer or supporting comment about this question? I can say from my perspective that several domestic standards bodies are beginning to roll some of the new requirements into their standard during scheduled update cycles. International standards, like ISO 13849-1: 2006 Safety of machinery —Safety-related parts of control systems, are clear to state that their intended audience is designers.

 

So my advice is that you should take careful notice of your particular standards for your business and types of machines to see if and how your particular standard might be impacted. For example, as an OEM or systems integrator you will most likely see these changes because of your machine control design activities within your business. On the other hand if you are an end user with no control system design engagement just how these changes impact your end user requirements is still unclear in my perspective.

 

You may not design circuits for your machines and you may not have designers within your business. Even though you may not be engaged in the design of machine control systems don’t you still need to be aware that the requirements will focus more strongly on the functions that are necessary to reduce each individual risk, and what performance is required for each function, rather than simply relying on particular components?

 

J.B. Titus, CFSE

Have you found difficulty understanding any of these issues?  Add your comments or thoughts to the discussion by submitting your ideas, experiences, and challenges in the comments section below.

 

Related articles:

Inside Machines: Does adopting ISO 13849-1:2006 change the U.S. model for compliance and enforcement?

Machine Safety – does OSHA reference consensus standards for compliance?

Machine Safety: Is OSHA okay with my 'acceptable' risk mitigation?

 

Contact: http://www.jbtitus.com for “Solutions for Machine Safety”.



Paul , KS, United States, 03/28/13 02:05 PM:

Question; since IEC 62508 functional safety is a measure of how safe a process or a machine is, should one design for the lowest PL rating?
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2015 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
2015 Top Plant: Phoenix Contact, Middletown, Pa.; 2015 Best Practices: Automation, Electrical Safety, Electrical Systems, Pneumatics, Material Handling, Mechanical Systems
A cool solution: Collaboration, chemistry leads to foundry coat product development; See the 2015 Product of the Year Finalists
Raising the standard: What's new with NFPA 70E; A global view of manufacturing; Maintenance data; Fit bearings properly
Special report: U.S. natural gas; LNG transport technologies evolve to meet market demand; Understanding new methane regulations; Predictive maintenance for gas pipeline compressors
Cyber security cost-efficient for industrial control systems; Extracting full value from operational data; Managing cyber security risks
Drilling for Big Data: Managing the flow of information; Big data drilldown series: Challenge and opportunity; OT to IT: Creating a circle of improvement; Industry loses best workers, again
Migrating industrial networks; Tracking HMI advances; Making the right automation changes
Understanding transfer switch operation; Coordinating protective devices; Analyzing NEC 2014 changes; Cooling data centers
Upgrading secondary control systems; Keeping enclosures conditioned; Diagnostics increase equipment uptime; Mechatronics simplifies machine design

Annual Salary Survey

After almost a decade of uncertainty, the confidence of plant floor managers is soaring. Even with a number of challenges and while implementing new technologies, there is a renewed sense of optimism among plant managers about their business and their future.

The respondents to the 2014 Plant Engineering Salary Survey come from throughout the U.S. and serve a variety of industries, but they are uniform in their optimism about manufacturing. This year’s survey found 79% consider manufacturing a secure career. That’s up from 75% in 2013 and significantly higher than the 63% figure when Plant Engineering first started asking that question a decade ago.

Read more: 2014 Salary Survey: Confidence rises amid the challenges

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.
This article collection contains several articles on the vital role that compressed air plays in manufacturing plants.