Crane Duty Classifications | What You Need to Know About Work Class

| Crane Duty Classifications | What You Need to Know About Work Class

As a standing feature of crane, work classes are based on the worklife of cranes, According to the frequency of use and the degree of load change, cranes are divided into light, medium, heavy and very heavy.

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May 10, 2023

Single Girder crane Almost every industry utilizes cranes and hoists, there is a wide range of lifting equipment to lift and use. How can you select the suitable equipment for application? Does it durable or economical enough?
Since crane is so important for workers' safety as well as maintenance and inspection requirements, KUNFENG CRANES tries to make it easier. As a standing feature of crane, work classes are based on the worklife of cranes, which helps you to select the most suitable crane. According to the frequency of use and the degree of load change, the loading rate can be divided into light, medium, heavy and very heavy.

Mechanism load spectrum
The load spectrum can be determined from the table below:

Rate of Loading	Mechanism Load Spectrum (Km)	Note
L1-Light	0.125	Occasional full load, regular light load
L2-Medium	0.25	Occasional very heavy load, regular medium load.
L3-Heavy	0.50	Regular heavy load and very heavy load.
L4-Very Heavy	1.00	Regular very heavy load.

Average daily operating time

Based on the average daily operating time, the utilization level of machinery refers to the level of busyness of its work, divided into 10 levels from T0 to T9, which refers to the total number of hours in operation during the total service life.

Class	Total Operating Time (hr)	Note
T0	200	Infrequent
T1	400
T2	800
T3	1600
T4	3200	Frequent light use
T5	6300	Frequent medium use
T6	12500	Infrequent regular use
T7	25000	Regular use
T8	50000
T9	100000

By merging the tables of total operating time and rate of loading, we can obtain a corresponding table of crane working class (Classification according to ISO), as shown below.

	T0	T1	T2	T3	T4	T5	T6	T7	T8	T9
L1			M1	M2	M3	M4	M5	M6	M7	M8
L2			M1	M2	M3	M4	M5	M	M8
L3	M1	M2	M3	M4	M5	M6	M7	M8
L4	M2	M3	M4	M5	M6	M7	M8

Electric Chain hoist The purpose of dividing the work level is to provide a reasonable and unified technical basis and reference standard for design, manufacture and user selection, so as to achieve better safety and economic effects, so that the working status of the crane can be more accurately reflected.

All in all, durability and safety are key factors of cranes. So it is necessary to determine the loading rate and working class of the crane, which ensure the safety and reliability of the crane.

Do you know what kind of work environment a hook crane can be used in? And what is the working classification?Please look at this article.