Posts by category

The Pro Rigger

Current Articles | RSS Feed RSS Feed

Mobile Crane Load Charts - 6 Things You Need to Know

  
  
  
  

We still get invited to work with new clients who have a small fleet of mobile cranes and a permanent crane operator crew. Typically the operators did not attend a union apprenticeship program, and has simply gained knowledge about cranes from an in-house process, sometimes rather hand-me-down. ITI is glad to work with organizations like this to conduct mobile crane operator training since they have a desire to upgrade their employees’ skill and knowledge levels and have chosen our company to get them “on-track”. Certainly we would make sure they are compliant with the state OSHA, federal OSHA requirements and the ASME B30.5 Mobile Crane standards. Blended with the training would be informational blocks concerning the manufacturer’s requirements and “best practices” for the cranes in their fleet. Concerning mobile crane load charts we would want their folks to realize:

  1. Initially, the gross load rating charts are based on a mobile crane load chartcombination of crane components in place, such as; counterweights by number and location on the crane, jibs stowed/erected, number of boom section (lattice inserts), hooks blocks and the like.
  2. Secondly, the gross load rating charts are affected by the crane “footprint” such as; on- tires stationary, on-tires pick/carry, outriggers extended 0/50/100%, and crawlers retracted/extended to name a few.
  3. On hydraulic cranes the capacity can vary greatly based on which telescoping sections are deployed. Special lift capacity columns are often available to the operator which indicates “manual or power-pinned fly” and a whole new crop of cranes provide capacity information based on multiple sections extended 46%-50% out to 100% so a designated column may read; base, 46%, 46%, 100%, 100%. The more sophisticated the boom configuration, the more adept the operator needs to be to ensure proper agreement between the on-board LMI dash-mounted computer and the actual crane setup.
  4. The crane’s load chart generally references the “reeving” (parts-of-line) capacity in conjunction with the wire rope as specified by the crane manufacturer. If the hoist rope specification changes, the lifting capacity can be affected, generally downward. During a project in Nigeria, I worked with a few cranes that could accept different sizes of hoist rope for the main hoist. They site opted to use the smaller diameter wire rope for the crane and unwittingly reduced the maximum lift capacity of the crane by 1/3.
  5. The crane’s range diagram is generally a part of the load chart decaling, or in the capacity chart notebook. This is an excellent perspective for an operator to determine the crane’s reach up and over obstructions.
  6. Ensure that the gross capacity load chart and all accommodating chart and diagrams reference the specific crane’s serial number anytime capacity can be affected. The crane was built with a set of parameters in mind which revolve around the criteria being applied in a planned manner. Any shortcuts or unapproved replacements can jeopardize the crane’s ability to perform as planned. A substitute component that is not “up-to-snuff” with the original crane designer’s specifications can lead to disaster.

Comments

very good and usefull for construction Industry and riggers especially.
Posted @ Friday, July 30, 2010 12:11 AM by Mathew Thomas
I agree with Mathew - this is very useful and sounds like your training is really thorough!
Posted @ Tuesday, August 17, 2010 9:21 AM by Nathan
very good
Posted @ Friday, August 20, 2010 2:36 PM by gingiera patrick
i want pinguley 100 tons loadchat
Posted @ Tuesday, September 14, 2010 5:36 AM by hafeez
Dear Sir, 
 
 
 
please provide me the crane selection chart for erecting larger diameter vessels of tanks
Posted @ Tuesday, December 07, 2010 11:47 PM by RAJINIKANTH
very important for all riggers and operator
Posted @ Friday, February 04, 2011 4:03 AM by Nazir
Want learn Crane safety checking method & Load chart reading & calculation
Posted @ Monday, March 28, 2011 6:06 AM by NANJUNDEGOWDA
thanks for your chart sir n m sory that i m going to present on ur chart on my college
Posted @ Tuesday, March 29, 2011 10:26 AM by sameer basnet
Has some very helpful information would like to stay in touch with chart info.
Posted @ Sunday, April 10, 2011 7:55 PM by Richard Alarcon
thank you sir for this important tips
Posted @ Tuesday, May 31, 2011 2:56 AM by aries manez
sir i want a load chart sumitumo sa 1200
Posted @ Sunday, June 26, 2011 4:29 AM by ratan pathak
Hi there, just a note, the "6 Things You Need to Know" information supplied, is only the very basic principles of crane operation. I would suggest you include wind affect when discussing load chart capacities and or abilities. Cheers
Posted @ Friday, September 16, 2011 7:48 PM by Wayne Dodd
There is more to know about crane operation. 
 
1)Positioning & ground stability 
 
2)Weather & wind speed 
 
3)Crane charecteristics & manufacturers guideline on operation ( limitations ) 
 
4)Safe allowable Load/angle/range from point A to point B and height clearance. 
 
5)Machine condition & SWL 
 
 
 
Posted @ Tuesday, April 10, 2012 10:34 PM by christopher
Dear sir, 
 
 
 
please advise me load chart for test Crane RK-450-2 after change it Wire rope ,maybe there some noted for safely Load Test in Inspection. Thank for your kind attention 
 
 
 
Regards, 
 
 
 
Muammar 
 
Yard Facility Insp. 
 
Email : muammar_st@yahoo.com
Posted @ Friday, May 18, 2012 5:05 AM by Muammar
send me information on load chart interpretation and load test of mobile cranes
Posted @ Sunday, May 20, 2012 5:21 AM by funganayi makhuza
Dear Mr. Makhuza, 
 
The simplest way to help you is to suggest that you consider purchasing 2 of the books from the ITI Bookstore about Mobile Crane and Interpreting Load Charts, by James Headley. 
 
Concerning load testing, nearly all manufacturers have their own distinct methods for conducting “stability” load tests, and tests within the structural range of the load chart. Both are very “delicate” in their approach. I suggest that you contact the specific crane manufacturer about their preferred methods and conditions for which to conduct load tests. 
 
Mike 
Posted @ Tuesday, May 29, 2012 6:30 PM by Mike Parnell
dear sir 
 
this is very good and useful hand out for me, 
 
thank you  
 
 
 
regards 
 
Posted @ Saturday, July 14, 2012 3:49 AM by sohail ahmed
When we say Max. lifting capacity of 100ton at the radius of 3 m do we expect the crane can lift 100tons at 3 m radius?
Posted @ Saturday, October 27, 2012 1:27 PM by Paul
we need of load chart and intreprnity
Posted @ Friday, June 28, 2013 2:23 AM by lakshmi kant
Dear..Sir.. 
Please give me advise I want to lift up load capacity 2,5Tons Radius 42 Meters my Question What's size Crane I use that's.( With Crane 80Tons enought or not ) Thank's 
Regard SaniYusuf
Posted @ Wednesday, August 14, 2013 5:56 AM by SaniYusuf
 
how to compuit the load u leftting 
Posted @ Wednesday, March 05, 2014 8:10 AM by allan
Dear Sir, 
 
One of our client is asking about the Liebherr crane LTM 1500 load chart configuration calculate in what percentage. we have been told the load chart calculated in 75% ratio (safety factor). 
 
Regards
Posted @ Wednesday, April 23, 2014 10:32 PM by sanju lama
Post Comment
Name
 *
Email
 *
Website (optional)
Comment
 *

Allowed tags: <a> link, <b> bold, <i> italics

Subscribe by Email

Your email: