Sling Length Calculation Tutorial
ฝัง
- เผยแพร่เมื่อ 17 ก.พ. 2017
- A simple guide to calculating the required length of slings for balanced loads.
Presented by Kevin Bennison - Lead Trainer and Managing Director of SWL Training Ltd.
Further tutorials to come in the future.
Visit our website for further information www.swltraining.com - แนวปฏิบัติและการใช้ชีวิต
Dear Trainer,
It is very useful to me ...
Love from India..
Keep on your service
Thank you
many thanks Kevin this was most helpful !!
I get benefit of your video , thank you teacher .
A very well explained tutorial...... Keep up the good work mate!!!
Thank you very much Jojo. Yes, we'll keep getting stuff out there.
Nice work Kevin, easy to follow.
Thanks very much Delboy - glad you found it useful.
yet again Kevin, a very well explained tutorial. clear and concise. well done fella, I look forward to seeing more👍
Wow, thank you very much Simon. That's very kind of you, and I'm pleased you find it helpful.
Great video a big help . Would like to see a video on unbalanced loads👍
Jazakallahu Khairan ( May the Almighty God Reward you with better) Very Helpful.... thanks a lot
I'd also like to say what a fantastic and well presented video to help people, keep up the great work mate.
Thank you very much Tristam. It's an absolute pleasure to do something that others find beneficial.
Really good overview great work
Fantastic videos Kev.
Thanks very much Ben. More to come over the next few months.
great video hope you do more and well explained.
Thank you. 😊
Thanks for the tutorial 👌
Another brilliant presentation Kev
Cheers Tim - glad you like it. Thanks for watching
lots of thanks very helpfull
Thanks mate for sharing the video. Got an idea of Thumb rule for sling length on stable load. Please update on unbalanced load of sling length.
Thankyou explained very well
Thank you for instruction
Great Video !
Thanks very much to you guys. Loving your work too. 👍
Thank you ..for this video good study
Hi sir ..! Thank you very much for a great useful explanation. If you don't mind can you upload a video for Lifting plan ( in UK standard LEEA)....!
thanks, great video.
Thank you for watching Alif. Glad you found it helpful.
As always a great video
Thanks very much Steve - glad you like it!
Thanks.
Good information
what if i know just the length of only one leg and all the three angles of a right angled triangle. can I get the length of the leg for remaining two sides ? i.e length is 6 meter and angles are 90+60+30 what will be the length of the legs for remaining two sides ?
Hi Kevin.
After 7 years of this video and we are finding new challenges.
I mostly do bottom lifting of different size containers, from 10f to 32f all of these for the construction industry.
I have a question, how would you calculate the D at the top of the container with a bottom lift, the D location is not immediately known, it is dependent on the angle between the bottom connection (where the chain bends at the top) and the diagonal 90 degree included angle on the top.
Thanks for well explained video
Glad you like it Aiden - thanks for watching.
Sir please kindly upload calculation video to find Mate length and pressure on each outrigger .
Excellent video 👍
Thanks very much Maurice - glad you like it!
Well explained video .Thank you I am waiting for the unbalance load
Hi Sadham. Thanks very much for your comment. We'll be launching an online course soon, which will include calculating sling length for unbalanced loads. Keep an eye on our website www.swltraining.com and our Facebook page.
Very well explained sir thanks
Thank you Ramesh - my pleasure.
Hello do you have videos on steel pipes valume weights etc
question on a different matter regarding slab lifting. My slab weighs 5t and the design shows x4 M24 threaded lifting anchors being used, however i can only see that these have a SWL of 2.5t. How is this possible? is the load distributed across x2 / x4 points making lifting the slab ok? i.e 2.5 x 4 = 10t SWL on the anchors meaning the anchors wont pull out during lifting. thank you for any help from anyone.
For four lifting points. When doing the calculation for SWL of multi-leg sling assembly to be use at an angle, you have to knock off one leg from the calculation hence remaining three legs.
The load is evenly distributed across three legs, the fourth leg is only for support.
For example,
👉🏾Load weight ÷ Mode factor = Minimum vertical capacity of each sling to be use in the multi assembly. 5÷2.1= 2.4ton.
👉🏾SWL of one leg × Mode factor = Maximum SWL of three or four leg sling assembly. 2.5×2.1= 5.25ton
Thank you very much, this is how to find the minimum sling length, could you please explain how to find the maximum sling length ?
Hi Ahmed, thanks very much for watching the video.
The purpose of this is to find how long your sling leg needs to be as a minimum. It's simply a case of selecting the next available length up from your supplier.
Maximum sling length would only really be relevant if you had limited available height (e.g. working indoors). In that case, trigonometry would be required. We cover this on some of our courses, and may do a public tutorial on it in the future.
Thanks Dear can you explain how we r to calculate D shackle capacity
Thanks for your comment. Refer to the WLL on the Dee shackle. If using Dee shackles in an angled arrangement, you must ensure that the sling is connected centrally within the shackle (i.e. 'in line') - calculate the overall SWL (rated capacity for the configuration) using Uniform Load Method.
NB: Dee shackles must not be used with anything connected out of central alignment - use bow shackles for angular connection.
Iam working Saudi Arabia Aramco rigger level 3 tell ne what about center of gravity tell me explain
Simple "Sum of the moments" problem in freshman Statics course. in this day and age, should be number of "Apps" for your cellphone. Input data required: 1) Load Weight 2) location of sling attachments on load 3) Load Center of Gravity 4) Length of Slings 5) Load Limit Rating for each Sling.
then how to cal length of sling if we are lifting from bottom side of container ????
sir please define what is 1.4?
Thanks for the video ..can you please make a tutorial about how to calculating the load factor in lifting operation ?
Hi Mortadha...tanks for watching and commenting. What is the 'load factor' you would like more information on?
About normal lifting operation by a mobile truck crane like hoisting a caravan ..etc.
@@mortadhahusain1877 From July/August, I aim to be done videos more regularly - so I'll consider doing one on that
Legend
Dear Mr.Kevin, Thanks for the well explained tutorial. I have a doubt, In an other video you have mentioned the load factor for 3 & 4 Legs is 2.1, but here you have mentioned 1.4. Request you to clarify.
Hi Prem,
The mode factor of 2.1 is for the sling rating (i.e. capacity), not for the length. Even if using four legs, the required length is calculated between the TWO lifting points that are farthest apart; the other two legs will be the same length as the two that have been calculated (unless the slinging method is asymmetrical).
@@InspHigher Thanks for your valuable & clear explanation. Request you to post more videos of chain length calculation for lifting Asymmetrical jobs & for lengthier jobs.
Hi Kevin would you be able to tell me why or where the 1.4 comes from and this is used?
Hi Wendy...thanks for watching.
The 1.4 comes from the sine value for 45 degrees being 0.7071 - which would be used if calculating the length of each sling using trigonometry. As we are calculating for two sling being at 90 degrees, we double that (= 1.4142) and just round it down to 1.4 for simplicity.
Thanks for you reply Kevin much appreciated!
Cheers from 🇨🇦 Canada
May i ask u about something plz in Canada?
@@MohamedGamal-oj7qs, sure.
@@georgevukelich607 thank u, so, how much does crane rigger take in an hour?..
And do u use any other social media for connection?
@@MohamedGamal-oj7qs , crane rigger can make from $20 to $40 per hour depending on training, certificates and experience. Starting pay would be near $20/hour but with hard work, honesty and diplomacy, hourly pay will increase accordingly.
Keep in mind there is extreme competition for all jobs, be it general labor to Engineering. Immigration is flooding the country with highly skilled individuals from all over the globe, causing great competition in the workforce driving down hourly rates.
I do not use social media.
@@georgevukelich607 yeah, that's great answer, thank u a lot, bro..
So, do u know any companies or agencies who bring workers from outside Canada?
where do you get the 1.4 from, I understand the length .. and the distance..
It's taken from the trigonometrical sine and cosine value of 45 degrees being 0.707.
Multiply that by 2 (for 90 degrees) = 1.414
It's then rounded down to 1.4
Thank you for your reply sir
do you have a video on unbalance loads?
Not yet, but we can provide training and tuition on it. www.InspHigher.co.uk
How to know "A"angle is come 60° or small?
It is not common for there to be a requirement to keep the included angle at lesser angles. However, for 30°, the sling length will be twice the 'D' distance.
where did you 1,4
Hi, how about 30° Angle. Is it stil divide by 1.4?
No
So divide by?
For 90 degree we need divided by 1.4
How 1.4 come
Where is the 1.4 coming from sorry if dart question
Not daft at all Lily. It comes from the Sine value of 45 degrees being 0.707
Well done sir, but i have two questions that:-
1. For 60 degrees why do i need to divide with 1.4?
2. For 90 degrees why i need to divide?
Is this denominator a constant?
Thanks for your comment.
a) As explained in the video, for 60 degrees, you do NOT need to divide by 1.4
b) This comes from the sine and cosine value of 45 degrees
Thanks for the clarification
@@InspHigher Hi sir,
sin45/cos45 is 0.7 then how you taken 1.4 ? can you explain
Because you’re taking the complete distance between two slings, rather than just the distance between the centre of gravity and one connection point. 2 x 0.7 = 1.4
I see it is more complicated in europe😅😅😅
I dont understand