Type of jib (Fly jib or fixed jib) may affect calculations.

Degree and angle of extension (a range of measurements between the minimum and maximum extensions).

Jib measurements are calculated with the following variables: Modern cranes sometimes use sensors to measure torque during operation. Torque can be dangerous when moving heavy loads, so this calculation is conducted under very strict safety parameters. The jib length, naturally, is therefore an extremely important calculation. Mobile crane jibs are articulated extensions from crane booms, designed to carry a specified safe load of torque in operation. In effect, you need to calculate a boom length with the capacity to manage all load movements to required distances. If you’re lifting a heavy load, the length of the boom must also include calculation of tonnage, as per above. The boom when extended factors in various possible loading stress issues.

The height of boom elevation at any given stage in operation.

Angle of inclination during operation in a 360 degree environment.

The boom length of a crane refers to the main boom, not a jib or other attached equipment for the purpose of this description.īoom measurements are calculated using the following factors:

Load to be moved (maximum single load weight).

Loads on the crane should not exceed 85% of the tipping weight level.Ī 10 ton load which must be moved 100 feet, therefore, is calculated with the following considerations:.

This is a safety margin, used to ensure that the crane can handle a particular weight without risk.

There is also the very important calculation of “tipping weight”, a weight at which a load becomes unsafe on a crane.

Tonnage capacity is calculated by calculating the weight to be moved by the crane, relative to the distance of the load movement.

Weight capacity reduces as distance increases.

Weight capacity calculation is based on a baseline measurement of the movement of a specified load starting at 5 feet from the centre pin of the crane.

The weight referred to is the weight of the load, not the crane.

Contact the experts at Pro Lift Crane Service for help determining exactly which crane is right for your job.

Formal measurements are usually calculated on mathematical tables related to loads, boom and jib sizes, and other critical performance specifications. The measurements and calculations described in this article are based on ranges of criteria. These measurements need to be assessed to meet handling capacity requirements.

There are multiple measurements which affect crane selection. Size specifications and other measurements are extremely important in selecting the right crane for the job. These very useful cranes come in many shapes and sizes, too. They are often critical in many jobs as the primary handlers and movers of materials. Mobile cranes (or hydraulic truck cranes) are very versatile, used in endless roles.

Crane load radius