Plant & Equipment (PUWER) - Design Confirmation

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Plant & Equipment (PUWER) - Design Confirmation - Design Calculations within regulatory compliance

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ADALE		#1 Posted : 26 January 2018 08:43:05(UTC)
Rank: Forum user		Good morning, I've just checked PUWER R4 for some steer on design drawings and calculations. I'm more used to this under CDM / Construction, but have a challenge of demonstrating that a frame design needs demonstrable calulations to state it can withstand intended loads with a safety factor (specified within an industry of being 5 times the intended load, not the more familiar 3). A slight rebuttle has been given and request for 'where's it say that' type of response has been given. I normally avoid legislation and will stay away from it once mentioned and move more toward collaboration and sensible risk management thereafter. But for now, HSW Act 2(2)(a) and PUWER R4 are a little vague requirement for designs. Is there anything more specific I'm missing? Thanks in advance


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paul.skyrme		#2 Posted : 26 January 2018 09:05:54(UTC)
Rank: Super forum user		Hello, There will be something more specific as both PUWER and CDM are general regulations. Is this "frame" part of a machine, or a structure? If a machine it will come under SMSR (MD), and will be subject to the EHSR's therein, and thus the requirement for a technical file, which will require the calculations to be undertaken, documented and stored. If a structure it may come under the CPR and the requirements of that. You quote a 5x load safety factor rather than 3, you must have this from someewhere, what does that document say about this?

1 user thanked paul.skyrme for this useful post.		ADALE on 26/01/2018(UTC)
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Ian Bell2		#3 Posted : 26 January 2018 09:20:26(UTC)
Rank: Super forum user		PUWER does not require you to check design calculations for strength of a machine components/assemblies. As Paul says, if a 'new' machine 'CE' marked under the Machine Directive the information might be in the Technical File provided by the Machine supplier/designer, but not always. If an old machine, historical use and current assessment of the known history/suitability would be a fair assumption about its strength. Some simple stress/loading calculations aren't too difficult to undertake though. Avoiding legislation and using collaboration/common sense isn't possibly the most effective approach to h&S though.

1 user thanked Ian Bell2 for this useful post.		ADALE on 26/01/2018(UTC)
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ADALE		#4 Posted : 26 January 2018 09:41:25(UTC)
Rank: Forum user		Thanks Ian, my experience has shown me being a technical juggernaut or legislative wizzard is less effective. I'd sooner talk about perks and benefits whilst avoiding losses before legislation. It appears as this frame is not part of a powered assembly etc. SMSR may not apply (if I remember / interpret them correctly). Load calcs may not be difficult to undertake. Obtaining may be a different thing. Thanks again


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