LIFTING UNIT CLASSIFICATION

Matterson hoists and crabs are designed to BS.466:1984 standards which facilitates the ready selection of the most economic lifting unit from a serialised range of products based upon lifting capacity and anticipated duty of the equipment. Knowing the safe working load and range of lift required the next stage in choosing the correct hoist for any application is to establish its Group Classification for which two factors are required:

CLASS OF UTILISATION

1) Average time the lifting unit will be in operation. By referring to Table A the class of Utilisation ‘T’ can be obtained against the average utilisation time.

Table A

Class of Utilisation	Assumed average daily Utilisation time (hours)	Service life of hoist (hours)
T1	≤ 0.25	400
T2	>0.25 and ≤ 0.5	800
T3	>0.5 and ≤ 1	1600
T4	>1 and ≤ 2	3200
T5	>2 and ≤ 4	6400
T6	>4 and ≤ 8	12500
T7	>8 and ≤ 16	25000
T8	>16	50000
T9	>16	>50000

STATE OF LOADING

2) Type of duty on which the uplifting unit will be employed. From Table B select the most appropriate type of duty and determine the State of Loading ‘L’.

Table B

State of Loading	Type of duty
L1	Hoists subjected very rarely to their maximum load and normally to very light loads.
L2	Hoists occasionally subjected to their maximum load but normally to rather light loads.
L3	Hoists frequently subjected to their maximum load but normally loads of medium magnitude.
L4	Hoists regularly subjected to their maximum loads.

B.S GROUP CLASSIFICATION

3) With the two factors from Tables A and B the British Standard Classification ‘M’ of the lifting unit can be determined from table C.

Table C

State of Loading (Table B)	Class of Utilisation (Table A)
	T1	T3	T3	T4	T5	T6	T7	T8	T9
L1	M3	M3	M3	M3	M4	M5	M6	M7	M8
L2	M3	M3	M3	M4	M5	M6	M7	M8	M8
L3	M3	M3	M4	M5	M6	M7	M8	M8	M8
L4	M3	M4	M5	M6	M7	M8	M8	M8	M8

Duty class to F.E.M. standards

Corresponding to 1.S.O. standards

Average daily operating time in hours				≤05		≤1		≤2		≤4		≤8		≤16
Class of Duty				V0,25	T2	V0,5	T3	V1	T4	V3	T6	V3	T6	V4	T7
type of service	1	L1	Light					1Bm	M3	1Am	M4	2 m	M5	3 m	M6
	2	L2	Medium			1Bm	M3	1Am	M4	2 m	M5	3 m	M6
	3	L3	Heavy	1Bm	M3	1Am	M4	2 m	M5	3 m	M6
	4	L4	Very Heavy	1Am	M4	2 m	M5	3 m	M6

GROUP								1Bm	M3	1Am	M4	2 m	M5	3 m	M6
Duty factor *								25%		30%		40%		50%
No of starts per hour								150		180		240		300

Illustrations and specifications may be changed without notice and are intended for guidance only. Please consult us for current product details.