Calculating Crane Net Capacity

Understanding a crane's capacity is necessary for safe crane operations. Part of understanding a crane's capacity is the net capacity calculation. Crane operators seeking operator certification must be able to perform a variety of calculations including net capacity. The concepts of net capacity, line capacity, chart capacity and gross capacity may also show up on BCSP certification exams. The presenter is Dr. Doug Martin. Dr. Martin earned his Ph.D. from Oklahoma State University and is a CSP. In addition Dr. Martin worked as a safety manager in the construction industry for 20 years. For more information about the EHSM program at Northeastern you may contact Dr. Martin at [e-mail]. Northeastern State University's Environmental, Health, and Safety Management program has been recognized as a Qualified Academic Program by the Board of Certified Safety Professionals (BCSP).

[@danjarvis6980]

Thank you SIR: excellent pacing and clarity.

[@abelabresm]

Thank. Very usefull info. I always said: learn to navigate by compass before get GPS. In my daily basic, the crane operator give me that finals numbers using the crane software, but for my is key to understand where all this numbers came from. all this classes are consolidating my knowleg and self confident like rigger. Thank a lot

[@leonardaquiela9418]

How to check luffing jig radius while lifting height is 36 and crane radius is around 46 meters.

[@SafetyProCalculations]

Draw me a diagram of the configuration. Label it with the measurements. Also what’s is the boom angle and jib offset?

[@leonardaquiela9418]

How to calculate 500 ton cranes outrigger pressure psi each outrigger.

[@SafetyProCalculations]

Pressure equals force divided by area. Weight of the crane and load divided by the total area of the contact surfaces. Divide that by the number of outriggers. Pressure will not be equal on all outriggers at same time. If loaded boom is positioned over an outrigger the pressure on that outrigger will be greater.

[@leonardaquiela9418]

Thank you very much buddy for your reply possible just explain the formulas example some lifting 20 tons using 500ton crane main telescope 30mt and 54mt luffing jig.

[@SafetyProCalculations]

@@leonardaquiela9418 just to be clear, make sure you are using actual weight of crane, not the crane’s capacity. A crane with a 500t capacity will not weigh 500 tons.

[@allanwagner4570]

So
Only deduct 4 parts of line??
Instructed to deduct 8 parts of line in class today??

[@SafetyProCalculations]

In the problem I'm working through in the video the crane is reeved with 4 parts line. Yes only deduct 4 parts line, tip to ground distance. Would also deduct the 10 feet of line hanging off the jib. Hopefully the problem you had in class was reeved with 8 parts line. LOL. This is hilarious.