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imponderabilius  
#1 Posted : 14 December 2016 17:27:30(UTC)
Rank: Forum user
imponderabilius

Hi guys,

I've been wondering what standards/regulations tell exactly how to use one trip slings - e.g. steel rebards come to the site pre-slung. I assume the white slings were used to load rebards onto the lorry. I also assume that we can use the same slings to unload the lorry. However, today our storeman outsmarted everyone and unloaded the lorry with a telehandler "so that the slings can be used to lift the rebar with the crane and land them in the excavation." Now, this seems to be a grey area to me - what about certification, thorough examination and suitability of the slings to do the lift? 

PM pushes to use them as they are fit for purpose but I want to make sure that we're covered. So I checked the relevant EN 1492-1 standard but it says nothing about one trip slings... any ideas where to find exact information on use of such slings?

Thanks!!

Roundtuit  
#2 Posted : 14 December 2016 20:16:49(UTC)
Rank: Super forum user
Roundtuit

The sling will have been manufactured with the same safety factors as re-usable slings

When they state "one-trip" the intention is that they will not be re-used multiple times so becoming part of a thorough lifting equipment examination by the supplier. This saves on the aggravation of recording and tracking lifting equipment highly unlikely to be returned in serviceable condition by customers.

In a previous life the company used "one-trips" for customer delivery - these were certified by batch of 30 purchases rather than individual serial number items and our customer instruction was that following delivery the sling should be cut through to prevent re-use.

If you think about this from a site perspective - the stock holder will load the vehicle with the sling then as they come off the stock holder delivery vehicle the sling does not magically disintegrate after use it is still there and available to crane the rebar around site.

But don't let your PM start to collect them back from site for re-use elsewhere.

imponderabilius  
#4 Posted : 15 December 2016 08:59:34(UTC)
Rank: Forum user
imponderabilius

Thanks for your answer. Searching for an  answer yesterday, I came across the following information on a supplier's website:

Disposable cargo slings to the British Standard to BS3481-3. These are made from High Tenacity Polyester Yarn and have a safety factor of 5:1. These multiple lift one way slings are used for the loading and unloading of cargo at intermediate drops until they are off loaded at there final destination; where the supplier of the cargo's liability will cease and the slings destroyed.

This, on the other hand, would imply that moving the cargo around the site should not be exercised. I have requested information from the   manufacturer and will post their reply when I receive it.

paul.skyrme  
#5 Posted : 15 December 2016 15:00:40(UTC)
Rank: Super forum user
paul.skyrme

As far as I can tell all parts of BS 3481 have been withdrawn.

Notably again as far as I can see part 3 has not been replaced with another standard.

From an engineering standpoint I would expect the slings to last for use with the load they are attached to, i.e. single load, not single lift.

That is once they are removed from the load, they are then life expired, until then I would expect them as long as they are undamaged to be suitable.

Current standards:

BS EN 1492-1:2000+A1:2008 Textile slings. Safety. Flat woven webbing slings made of man-made fibres for general purpose use

BS EN 1492-2:2000+A1:2008 Textile slings. Safety. Roundslings made of man-made fibres for general purpose use

BS EN 1492-4:2004+A1:2008 Textile slings. Safety. Lifting slings for general service made from natural and man-made fibre ropes

BS ISO 18264:2016 Textile slings. Lifting slings for general purpose lifting operations made from fibre ropes. High modulus polyethylene (HMPE)

Roundtuit  
#6 Posted : 15 December 2016 22:50:43(UTC)
Rank: Super forum user
Roundtuit

Beware the internet - check facts and if all else fails talk to your supplier.

Paul's post is spot on regarding standards for web slings - the reference found is out if date indicating either the provider does not maintain their web site accurately or has no understanding of the information they are communicating
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