A Guide to Duty Classification of Lifting Hoists
Due to the variety of hoist types available it is necessary for the user to make sure each hoist is suitable for the job intended.
The safe working load and range of lift is required when choosing your hoist, however it is important to know the operating time usage and the range of loads to be lifted to ascertain the required duty rating.
Consideration of your hoist duty classification will enable the user to obtain a hoist designed for optimum performance and minimise fault issues.
CLASS OF UTILISATION
1) To obtain the class of utilisation ‘T’ in this table select the assumed average daily utilisation time in hours.
STATE OF LOADING
2) In this table select the type of duty which will give you the State of Loading ‘L’.
B.S GROUP CLASSIFICATION
3) With your selected class of utilisation ‘T’ from Table A and State of Loading ‘L’ from Table B the British Standard Classification ‘M’ of the lifting unit can be determined from table C.
The below table shows the indicated duty rating as a percentage, i.e 25% = 15minutes in the hour along with the number of starts i.e depression on the pendant/remote control button.
The duty factor is applicable on all movements of the hoist. It is common to have a lower duty factor on the traverse movement of the crane however it is important to factor the traverse into the decision. A long travel beam could result in a hoist being unable to traverse the building without requiring a break during the hourly operation.
To discuss your Classification of Lifting Hoists
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