Planning an overhead lift all starts with understanding the weight of the load you plan on lifting and moving. When using load cells or dynamometers, always refer to the manufacturer’s recommendations for scheduled maintenance and calibration to ensure your device is in compliance and continues to provide accurate measurements. Overloads are prohibited according to OSHA and ASME B30 standards, and can stress and damage the crane equipment-putting nearby employees in danger if the crane were to fail. An overload occurs when a lift exceeds the crane’s rated capacity. Many load cells and dynamometers come with overload sensors that alert the operator, safety managers, or other designated personnel if the crane has been overloaded. These types of devices also send data to a handheld device or remote workstation.
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Others can have digital displays right on the device itself, and some even work with handheld digital devices or computer software to send the readout to an operator who may be performing remote monitoring and diagnostics of the crane equipment.Īnother type of load cell device is a loadshackle, which is essentially a fully-rated lifting shackle with integrated electronics and microprocessors to determine the weight of a load once lifted into the air. Some are mechanical with an analog display that utilizes a needle and dial-similar to how many bathroom or medical scales operate. These devices can display the measured weight of the load in a variety of ways. The load is then attached to the load cell and the load cell calculates the weight of the load by measuring the force being applied to it using a strain gauge, or hydraulic or pneumatic pressure inside the device. These devices, called load cells or dynamometers, are mounted in line with the crane hook, slings and hardware.
Multiply the approximate pounds per cubic foot of the material times the calculated volume of the load to get the weight of the object or load.Īdditionally, other devices can be included in the rigging that will provide the operator with a read-out and determination of the load weight when it’s lifted slightly off of the ground. The table below can be used for approximate weight values of common loads and materials: Material Step 2: Determine the Material You’ll Be Lifting Or, break the object into two or more smaller rectangles and then calculate the weight of each part and add them together. Hollow Cylinder: Volume = 3.14 x Length x Wall Thickness x (Diameter – Wall Thickness)Ĭomplex Shapes: In some instances, imagine the whole object is enclosed in a rectangle and then calculate the volume of that rectangle. Rectangle/Square: Volume = Length x Width x Height In this section, we’ll provide you with some basic calculations for calculating the weight of different sized loads of varying material types. If no load weight information has been provided, then you will need to do some calculations to determine the weight of the load you are going to lift.
Refer to the Manufacturer’s Specifications or Catalog Data Use an Industrial Scaleįor smaller and lighter loads, you may be able to use an industrial floor scale commonly found in production areas or the shipping and receiving department of a facility. If the load was shipped or transported to your facility or job site, there should be some type of weight information included on the shipping paperwork you received. Review Bill of Lading or Shipping Documentation Product prints or engineered drawings of the load may indicate the final assembled weight. Refer to Engineered Prints or Design Plans In many instances, your overhead crane was probably designed with a duty cycle and capacity specifically for that repetitive lifting application, so the weight of the load was accounted for when the crane was built. If it’s a load that you regularly lift and move through your facility-like a steel coil or a bundle of pipes or lumber-then you will already know the weight of the load. Look for any visual indications of load weight prior to selecting the appropriate lifting and rigging equipment. The load may be marked with the weight by the manufacturer, or may have been previously calculated and marked. Look at the Load to See if the Weight is Marked
There are many different ways you can easily identify the weight of a load without doing any type of calculations or using specially-engineered load cells (like the Crosby | Straightpoint load cells) or dynamometers.
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