The knowledge of the standards is not enough; you also need to learn and understand criteria such as markings, tags, designs, and labels for below the hook lifting equipment.
Any below-the-hook lifting gear should have a sticker that shows the following important information: ASME BTH-1 service class, ASME BTH-1 design category, rated voltage, cold current amps, rated load, lifter weiggt, serial number, manufacturers name, and their address. The address of the manufacturer could be a website and the serial number should be unique to that particular lifter. Finally, the cold currents amp and rated voltage specifications should be on the tag only if it is applicable.
Every device should have a rated load marking on them. If the device is made up of many lifters that can be detached, each of these lifters should also have a marking with individual rated loads.
For ASME BTH-1 devices, there are two design categories:
Design Category A
These devices are limited to a Service Class of 0 only. They need a lower design factor. They are on paint lines or in manufacturing industries where the load is the same every time, and no external conditions are acting on the freightage. Devices in this category should be designated when the magnitude and variation of loads applied on the lifter can be predictable.
Design Category B
In this category, the devices should be made such that the magnitude and load variations applied to the lifter cannot be predicted. This is the most common category. The tools in this category fall under the service class of 0 to 4 and require a design factor of ratio 3:1.
The class of a lifter is based on the load cycles performed in a day. Devices in service class 0 may have a load cycle of up to 20,000, those in class 1, up to 100,000 cycles and class 2 up to 500,000. Also, lifters in grade 3 may have load cycles approximately of up to 2,000,000, and class service four, up to 25,000,000 cycles or more in 24 hours.
Some manufacturers may have this information on their websites rather than on the device.
Inspecting your below-the-hook lifting gear and maintaining proper inspection throughout its lifetime is essential for OSHA compliance. You need to examine the tools before a lift is made and during the lifting. Frequent inspection by an expert and periodic review is also required.
All welding must be done following ANSI/AWS D14.1. Reliable manufacture will ensure all welding is done and therefore relieved of the need to do the welding yourself.
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