[Lee Burbidge]

Do you know the tonnage your ratchet straps can take if you are using them to fix your wfp tank inside your van?

Just for your information to ensure you have got the right straps........

100L at 30mph = 5.2 ton of forward force

1000L at 30mph = 52 tonnes

Imagine what force is involved at 40, 50, 60mph

[Window Washers]

great post Lee

[andyM]

Where did you get your formula from Lee?
Surely the answer should be in Newtons not Tonnes?
F = m x a 
 

[Dave Willis]

52 tonnes 

Is that halved if you use two straps or does it remain the same? Can't see many lashing eyes standing up to half that.

[gary999]

ratchet strapping from a reputable company is batch proof tested to destruction
and rated at 6:1 which is 6 times the safe working load of the strap the metal
fittings are the weak points they are only at a ratio of 2:1

if you buy ratchet straps from anywhere make sure they have a test cert or at least
a certificate of comformity at least you know you will be buying genuine gear

[Perfect Windows]

Do you know the tonnage your ratchet straps can take if you are using them to fix your wfp tank inside your van?

Just for your information to ensure you have got the right straps........

100L at 30mph = 5.2 ton of forward force

1000L at 30mph = 52 tonnes

Imagine what force is involved at 40, 50, 60mph

Very vague on the maths to get there...

Crash at http://www.youtube.com/watch?v=TMl-WQ5XkMI has a time from hitting wall to dead stop of around 70 milliseconds, so 0.07 seconds.

Bung that into Newtons equations for acceleration (see the three or four posts at: http://www.cleanitup.co.uk/smf/index.php?topic=148875.msg1230162#msg1230162 ) and you get an effective weight of a 650L tank during that deceleration of 140 tons.  Your 1000L would be about 215 tons.

Now the news is that that was an empty van in the test, so your full van will take more time to stop and increase the amount of the van that crumples, but the numbers are a good indication of the scale of the problem.

Vin

[Nathanael Jones]

Its worth mentioning that straps do degrade over time (especially when wet) and most manufacturers recommend re-testing or replacing on a regular basis.

[gary999]

Its worth mentioning that straps do degrade over time (especially when wet) and most manufacturers recommend re-testing or replacing on a regular basis.

when i used to test lifting gear on site the normal period for replacement was 6months
with wear and tear but that was with gear which was being used taken off thrown around
and stored in ridiculas places.

you should get away with checking your straps every twelve months check for fraying
movement of the stiching especially in the areas of where the restraint fittings ares seated
check for correct movement of the ratchet itself and any movement of the fittings
themselves all lifting equipment fittings are designed to give or stretch before fracturing
as most lifting a strapping tackle is subject to shock loading, any faults in these areas
replace straight away

[Lee Burbidge]

52 tonnes 

Is that halved if you use two straps or does it remain the same? Can't see many lashing eyes standing up to half that.

To ensure non failure your straps will have to be that for each.

[Lee Burbidge]

ratchet strapping from a reputable company is batch proof tested to destruction
and rated at 6:1 which is 6 times the safe working load of the strap the metal
fittings are the weak points they are only at a ratio of 2:1

if you buy ratchet straps from anywhere make sure they have a test cert or at least
a certificate of comformity at least you know you will be buying genuine gear

Can I just check, the numbers your quoting are in tons, right? so your talking about 6 ton load straps. Because they would not stop 52 tons of forward force.

[Lee Burbidge]

ratchet strapping from a reputable company is batch proof tested to destruction
and rated at 6:1 which is 6 times the safe working load of the strap the metal
fittings are the weak points they are only at a ratio of 2:1

if you buy ratchet straps from anywhere make sure they have a test cert or at least
a certificate of comformity at least you know you will be buying genuine gear

Can I just check, the numbers your quoting are in tons, right? so your talking about 6 ton load straps. Because they would not stop 52 tons of forward force.

I just read your post again, does that mean a 5 ton strap will take 6 times 5 tons??

[CLEANCARE WC]

Can i just ask why they use ratchet straps on lorrys for loads way heavier than 650kilo if they are so terrible?

[Lee Burbidge]

Its worth mentioning that straps do degrade over time (especially when wet) and most manufacturers recommend re-testing or replacing on a regular basis.

My new employee told me he snapped one tightening it up once.

[Lee Burbidge]

Have you seen the video of the crash test with a system bolted into the floor of a van. If that crash test dummy was a real human, he would look like a bad cheese and tomato pizza!!

[H S and Son]

Can i just ask why they use ratchet straps on lorrys for loads way heavier than 650kilo if they are so terrible?

Ratchet straps don't stop moving loads on lorries necessarily if there's an accident. What makes you think they do?

http://alturl.com/z5d85

[mikecam]

Have you seen the video of the crash test with a system bolted into the floor of a van. If that crash test dummy was a real human, he would look like a bad cheese and tomato pizza!!

I seen the video of the ionics tank bolted to the floor and its seemed fine. The Ionics test and accreditation was for the design of a tank frame that did not collapse. Not a method of securing a tank frame in a van.A lot of what they reproduce as saftey features are at best misrepresented as saftey features.

[stuart mc]

Its worth mentioning that straps do degrade over time (especially when wet) and most manufacturers recommend re-testing or replacing on a regular basis.

My new employee told me he snapped one tightening it up once.

I have snapped one as well but it wasn't a 5 tonne heavy duty strap, it was a cheap rubbish one and I was using it as a engine hoist

[Perfect Windows]

Have you seen the video of the crash test with a system bolted into the floor of a van. If that crash test dummy was a real human, he would look like a bad cheese and tomato pizza!!

I seen the video of the ionics tank bolted to the floor and its seemed fine. The Ionics test and accreditation was for the design of a tank frame that did not collapse. Not a method of securing a tank frame in a van.A lot of what they reproduce as saftey features are at best misrepresented as saftey features.

Not quite sure what you're saying - can you rephrase it?  I thought the fitting WAS part of their test, unless I've misunderstood what you're saying.

Vin

[mikecam]

Have you seen the video of the crash test with a system bolted into the floor of a van. If that crash test dummy was a real human, he would look like a bad cheese and tomato pizza!!

I seen the video of the ionics tank bolted to the floor and its seemed fine. The Ionics test and accreditation was for the design of a tank frame that did not collapse. Not a method of securing a tank frame in a van.A lot of what they reproduce as saftey features are at best misrepresented as saftey features.

Not quite sure what you're saying - can you rephrase it?  I thought the fitting WAS part of their test, unless I've misunderstood what you're saying.

Vin

Sorry, i got it completley arse about face. It is the method of securing the tank that is accredited

[gary999]

ratchet strapping from a reputable company is batch proof tested to destruction
and rated at 6:1 which is 6 times the safe working load of the strap the metal
fittings are the weak points they are only at a ratio of 2:1

if you buy ratchet straps from anywhere make sure they have a test cert or at least
a certificate of comformity at least you know you will be buying genuine gear

Can I just check, the numbers your quoting are in tons, right? so your talking about 6 ton load straps. Because they would not stop 52 tons of forward force.

I just read your post again, does that mean a 5 ton strap will take 6 times 5 tons??

depends on the quality of strap wher you have bought them from,the swedish lifting
tackle and strapping company i worked for used to batch test their ratchetsstraps
roundslings webslings etc at the depot where i was based we had a 100tonne ram
where we proof tested gear to destruction we often proof tested 5tonne and 10 tonne
ratchet strapping for customer wanted more than just conformity of our parent
companies batch testing.

not once did the strapping fail before 6 times its safe woprking load or swl
which is normally on the printed label this is not to be confused with strap labels
which have mbl on the label which stands for minimum breaking load which would
normally be on a lower quality strap.

so yes on a correctly supplied good quality strap of 5 tonne should only
break under load at 6x its safeworking load.

the thing is and i apologise for waffling that these slings are only certified
to their swl which well within their capacity because of euro and british standards
to keep items used well within safety margins.

the real problem though isnt the strap itself but the fittings attached they are
made out of poorer quality material because they are only for restraint and not
shock loading at best these are rated at only twice the safe working load so
these would fail first.

their are ways round this but you would have to go to a lifting tackle company for
the supply of strapping and the correct grade t steel fittings that at least would
give you a ratio of 4:1

sorry for waffling