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#Crane lift plan calculations manual#

B-5.02.02 interpret engineers’ and manufacturers’ specifications.

B-5.02.01 determine factors that affect the strength of the sling such as choke, basket, vertical or bridle configuration.

Sub-task - B-5.02 Performs working load limit ( WLL) calculations.

B-5.01.03 calculate the different sling leg tension based on offset centre of gravity and unequal sling loading.

B-5.01.02 calculate the angle of each sling leg to determine the effect of the angle on the tension of the sling.

#Crane lift plan calculations manual#

B-5.01.01 determine rigging capacity by referring to charts or doing manual calculations.Sub-task - B-5.01 Performs sling angle calculations. K 9 sizes and types of hardware such as shackles, lifting eyes and beams.K 8 design factors of safety according to jurisdictional regulations.K 7 sling configurations (hitches) such as choker, basket, vertical and bridle.K 5 lift data such as available rigging, pick points, load size, weight and centre of gravity.K 4 effect of sling angle on sling capacity.ContextĪccurate rigging calculations are important for the proper selection and use of rigging and hardware to ensure safe hoisting operations. B-4.02.05 de-rate crane capacity using various site restrictions.B-4.02.04 locate warnings within load charts, range diagrams and manufacturers’ notes.

B-4.02.03 determine crane capacity using boom length, angle and radius.

B-4.02.02 calculate gross load and net capacity.

B-4.02.01 refer to the load charts for reductions of rated capacity.

Sub-task - B-4.02 Interprets load charts.

B-4.01.04 determine main boom angle when boom is partially extended and the jib is erected by using range diagram.

B-4.01.03 refer to manufacturers’ specifications for configurations such as counterweight, crawler and outrigger configuration.

B-4.01.02 use range diagram to determine boom length and offsets needed to ensure radius and tip height can be achieved.B-4.01.01 measure horizontal distance from centre of rotation to centre of gravity of the suspended load.Sub-task - B-4.01ĝetermines radius and crane configuration. K 8 attachments and configurations, and capacity deductions.K 7 radius, boom length, angle, and gross and net capacity.K 5 line pull and working load limit ( WLL).K 4 methods of measuring radius such as measuring tape and dry run.K 2 jurisdictional safety regulations and site-specific requirements.K 1 manufacturers’ specifications such as load charts and range diagrams.Important considerations are radius and crane configuration. ContextĬalculating crane capacity involves interpreting load charts, range diagrams and manufacturers’ specifications. B-3.02.02 perform mathematical calculations such as volume times unit weight for weights of objects.B-3.02.01 determine and apply formulas needed depending on object shape.B-3.01.04 compare object to blueprints or engineered drawings to confirm that no weight has been added.B-3.01.03 confirm that no modifications have been made that affect the weight of the object.B-3.01.02 verify units of measurement (metric or imperial) when missing or incorrect on documentation such as bills of lading and blueprints.B-3.01.01 refer to unit chart to determine weight of material to be lifted.K 4 factors contributing to load weight and centre of gravity such as ice, snow, crating, shifting liquids, wind and lifting in water.K 2 formulas for conversion between imperial and metric systems.K 1 sources of load weight information such as bills of lading, stamped weights, engineered drawings and previous lift history.The ability to accurately calculate the load weight is vital to the safe operation of mobile cranes. This emphasis is due to an increased awareness around safety and the complexity of charts and configurations Related ComponentsĪll components apply. Employers, contractors and mobile crane operators are placing more emphasis on the accurate interpretation of load charts for safe operation.