hoisting standards for mining hoist

Working Class Division

1Service grade of crane(the using frequency )

Service

grade mark

Working cycle N

(upper limit) Remarks

Service

grade mark

Working cycle N

(upper limit) Remarks

U0 1.6104

Don't often use

U5 5105 Often

interrupted using

U1 3.2104 U6 1106 Buy to use

U2 6.3104 U7 2106 Busier to use

U3 1.25105 U8 4106 Busiest to use

U4 2.5105 Often use with

light duty U9 >4106 Busiest to use

One working cycle:SlingliftingtravelingdownunloadingReturn to the original place with empty hook.

Calculating formula of total working cycles :N=3600YDH/tc

Y:Using age of crane(usually 2030 years) D:Working days in one year(265 days)

H:Working hours in one day tc :One working cycle time(s),is related with working frequency.

2Loading state grade of crane(The loading degree in lifting)

Loading state means the approached degree of usual lifting quality of crane to the rated lifting capacity

Pi: The i time lifting quality.

Pmax:Rated lifting capacity.

ni:loading Pi action times

N:Total working cycles

Loading state Load spectrum coefficient Kp Remarks

Q1---light 0.125 Hardly lifting rated load, usually lifting light load.

Q2middle 0.25 Sometimes lifting rated load,usually lifting middle load.

Q3heavy 0.5 Often lifting rated load,usually lifting heavy-duty load

Q4heaviest 1.0 Frequently lifting rated load.

3Working class of craneGBISO FEM standard1Bm=A3 1Am=A4 2m=A5 3m=A6 4m=A7

Loading

state

Load

spectrum

coefficient Kp

Working class

U0 U1 U2 U3 U4 U5 U6 U7 U8 U9

Q1light 0.125 A1 A1 A1 A2 A3 A4 A5 A6 A7 A8

Q2middle 0.25 A1 A1 A2 A3 A4 A5 A6 A7 A8 A8

Q3heavy 0.5 A1 A2 A3 A4 A5 A6 A7 A8 A8 A8

Q4heaviest 1.0 A2 A3 A4 A5 A6 A7 A8 A8 A8 A8

Note: should make clear the followings, rated lifting capacity, how many days will it work in one week, how

many hours will it work in one day, how much weight it will lifting usually, how many will it last of one working cycle,

interval of continuous operation or two working cycles.

LIFTING UNIT CLASSIFICATION

Hoists and Grabs 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

FEM Table T.2.1.2.2.

Classes of Utilizzation

Symbol Total duration of use (number nmax of hoisting cycles)

U0 < nmax <

16 000

U1 16 000 < nmax <

32 000

U2 32 000 < nmax <

63 000

U3 63 000 < nmax <

125 000

U4 125 000 < nmax <

250 000

U5 250 000 < nmax <

500 000

U6 500 000 < nmax <

1 000 000

U7 1 000 000 < nmax <

2 000 000

U8 2 000 000 < nmax <

4 000 000

U9 4 000 000 < nmax <

.


Spectrum Classes

Symbol Spectrum Factor kp

Q1 < kp <

0.125

Q2 0.125 < kp <

0.250

Q3 0.250 < kp <

0.500

Q4 0.500 < kp <

1.000

.


Appliance Groups

Load Spectrum Class

Class of utilization

U0 U1 U2 U3 U4 U5 U6 U7 U8 U9

Q1 A1 A1 A1 A2 A3 A4 A5 A6 A7 A8

Q2 A1 A1 A2 A3 A4 A5 A6 A7 A8 A8

Q3 A1 A2 A3 A4 A5 A6 A7 A8 A8 A8

Q4 A2 A3 A4 A5 A6 A7 A8 A8 A8 A8

.


Guidance for group classification of APPLIANCE

Reference

Type of appliance Particulars concerning nature of

use (1)

Appliance

group Designation

01 Hand-operated appliances - A1 - A2

02 Erection cranes - A1 - A2

03 Erection and dismantling cranes for power stations,

machine shops, etc. - A2 - A4

04 Stocking and reclaiming trasporters Hook duty A5

05 Stocking and reclaiming trasporters Grab or magnet A6 - A8

06 Workshop cranes - A3 - A5

07 Overhead travelling cranes, pig-breaking cranes,

scrapyard cranes Grab or magnet A6 - A8

08 Ladle cranes - A6 - A8

09 Soaking-pit cranes - A8

10 Stripper cranes, open- heart furnace-charging cranes - A8

11 Forge cranes - A6 - A8

12.a Bridge cranes for unloading, bridge cranes for

containers Hook or spreader duty A5 - A6

12.b Other bridge cranes (with grab and/or slewing jib crane) Hook duty A4

13 Bridge cranes for unloading , bridge cranes (with grab

and/or slewing jib crane) Grab or magnet A6 - A8

14 Drydock cranes, shipyard jib cranes, jib cranes for

dismantling Hook duty A3 - A5

15 Cockside cranes (slewing, on gantry), floating cranes

and pontoon derricks Hook duty A5 - A6

16 Dockside cranes (slewing, on gantry), floating cranes

and pontoon derricks Grab or magnet A6 - A8

17 Floating cranes and poonton derricks for very heavy

loads (usually greater than 100 ton) - A2 - A3

18 Deck cranes Hook duty A3 - A4

19 Deck cranes Grab or magnet A4 - A5

20 Tower cranes for building - A3 - A4

21 Derricks - A2 - A3

22 Railway cranes allowed to run in train - A4

(1) Only a few typical cases of use are shown, by way of guidance, in this column.


Guidance for group classification of MECHANISM

Reference

Type of appliance Particulars

concerning

nature of

use (1)

Type of mechanism

Designation Hoisting Slewing Luffing Traverse Travel

01 Hand-operated appliances - M1 - - M1 M1

02 Erection cranes - M2-M3 M2-M3 M1-M2 M1-M2 M2-M3

03 Erection and dismantling cranes for

power stations, machine shops, etc. - M2 - - M2 M2

04 Stocking and reclaiming trasporters Hook duty M5-M6 M4 - M4-M5 M5-M6

05 Stocking and reclaiming trasporters Grab or

magnet M7-M8 M6 - M6-M7 M7-M8

06 Workshop cranes - M6 M4 - M4 M5

07 Overhead travelling cranes, pig- Grab or M8 M6 - M6-M7 M7-M8

breaking cranes, scrapyard cranes magnet

08 Ladle cranes - M7-M8 - - M4-M5 M6-M7

09 Soaking-pit cranes - M8 M6 - M7 M8

10 Stripper cranes, open- heart furnace-

charging cranes - M8 M6 - M7 M8

11 Forge cranes - M8 - - M5 M6

12.a Bridge cranes for unloading, bridge

cranes for containers

Hook or

spreader

duty

M6-M7 M5-M6 M3-M4 M6-M7 M4-M5

12.b Other bridge cranes (with grab and/or

slewing jib crane) Hook duty M4-M5 M4-M5 - M4-M5 M4-M5

13

Bridge cranes for unloading , bridge

cranes (with grab and/or slewing jib

crane)

Grab or

magnet M8 M5-M6 M3-M4 M7-M8 M4-M5

14 Drydock cranes, shipyard jib cranes, jib

cranes for dismantling Hook duty M5-M6 M4-M5 M4-M5 M4-M5 M5-M6

15 Cockside cranes (slewing, on gantry),

floating cranes and pontoon derricks Hook duty M6-M7 M5-M6 M5-M6 - M3-M4

16 Dockside cranes (slewing, on gantry),

floating cranes and pontoon derricks

Grab or

magnet M7-M2 M6-M7 M6-M7 - M4-M5

17

Floating cranes and poonton derricks

for very heavy loads (usually greater

than 100 ton)

- M3-M4 M3-M4 M3-M4 - -

18 Deck cranes Hook duty M4 M3-M4 M3-M4 M2 M3

19 Deck cranes Grab or

magnet M5-M6 M3-M4 M4-M3 M4-M5 M3-M4

20 Tower cranes for building - M4 M5 M4 M3 M3

21 Derricks - M2-M3 M1-M2 M1-M2 - -

22 Railway cranes allowed to run in train - M3-M4 M2-M3 M2-M3 - -

(1) Only a few typical cases of use are shown, by way of guidance, in this column.

hoisting standards for mining hoist

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