SERVICE CLASSIFICATION OF HOIST

Safe and effective operation of the hoist is dependent on correct classification of the hoist’s operation group. According to FEM9.511 and China standard the hoist’s operating group can be determined from load spectrum and average Daily operating time.

Load Spectrum

The load spectrum can be determined from the table below

Light Occasional full load Usually light loadSmall fixed load

Medium Occasional full load Usually light loadAverage fixed load

Heavy Repetitive full load Usually average loadHeavy fixed load

Very Heavy Usually almost full load Very heavy fixed load

Average daily operating time

The average daily operating time of the hoist can be calculated from the running time of the hoisting machinery (Hours/day):
H =average hoisting height (m)
N =number of work cycles per hour(cycles/h)
T =daily working time (h)
V =hoisting speed (m/min)

Determining the operating group of the hoist

When the load spectrum and the average daily operating time of the hoist are identified, the hoist’s operating group is obtained from the table below:

Load Spectrum	Average daily operating timeISO(GB) / FEM ( hours per day)
	≤ 0.5	≤1	≤2	≤4	≤8	≤ 16
Light			M3 1Bm	M4 1Am	M5 2m	M6 3m
Medium		M3 1Bm	M4 1Am	M5 2m	M6 3m	M7 4m
Heavy	M3 1Bm	M4 1Am	M5 2m	M6 3m	M7 4m
Very Heavy	M4 1Am	M5 2m	M6 3m	M7 4m

Comparing of crane class

	工Duty Code
ISO/BS/DIN	M3	M4	M5	M6	M7	M8
GB	A3	A4	A5	A6	A7	A8
FEM	1Bm	1Am	2m	3m	4m	5m
CMAA	A	B	C	D	E	F
HMI	H2	H3	H4	H5	H5	H6

	Hoist Standard Value ( Hr)
SWP(h)	400	800	1,600	3,200	6,300	12,500
Duty %ED	25	30	40	50	60	60
Starts (s/h)	150	180	240	300	360	360
Run Time(h)	3,200	6,300	12,500	25,000	50,000	100,000
Starts	480,000	1,134,000	3,000,000	7,500,000	18,000,000	42,000,000
Overloads	1,000	1,000	1,000	1,000	1,000	1,000