hoisting standards for mining hoist
DESCRIPTION
Mine StandardsTRANSCRIPT
-
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 <
.
FEM Table T.2.1.2.3.
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
.
FEM Table T.2.1.2.4.
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
.
FEM Table T.2.1.2.5.
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.
FEM Table T.2.1.3.5.
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.