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Email: [email protected]
The design life expectancy of a crane refers to the total number of working cycles that the crane can complete from the beginning of use to the final scrapping. Cycle refers to a complete process from lifting an item to the time when the next item can start to be lifted, including crane operation and normal rest in energy.
Ⅰ、The use level of the crane as follow:
|
Use level |
Service life cycle |
Description |
|
U0 |
L≦16 thousand |
Rarely used |
|
U1 |
16 thousand< L ≦ 32 thousand |
|
|
U2 |
32 thousand< L ≦ 63 thousand |
|
|
U3 |
63 thousand< L ≦ 125 thousand |
|
|
U4 |
125 thousand< L ≦ 250 thousand |
Infrequent use |
|
U5 |
250 thousand< L ≦ 500 thousand |
Moderate use |
|
U6 |
500 thousand< L ≦ 1 million |
More frequent use |
|
U7 |
1 million< L ≦ 2 million |
Use frequently |
|
U8 |
2 million< L ≦ 4 million |
Extremely frequent use |
|
U9 |
4 million≦ L |
Ⅱ、Load state class as follow:
The ratio of the typical lifting capacity and the number of lifting times to the rated lifting capacity and the total number of lifting times within the design life expectancy.
|
Load level |
Kp |
Description |
|
Q1 |
Kp ≦ 0.125 |
Rarely lift the rated load, and often lift the lighter load |
|
Q2 |
0.125< Kp ≦ 0.25 |
Rarely lift rated load, often lift medium load |
|
Q3 |
0.25< Kp ≦ 0.5 |
Sometimes the rated load is lifted, and the heavier load is lifted more often |
|
Q4 |
0.5< Kp ≦ 1 |
Lift the rated load frequently |
Ⅲ、Chinese standard crane working class
|
Load level |
Kp |
Use level (GB/T3811-2008) |
|||||||||
|
U0 |
U1 |
U2 |
U3 |
U4 |
U5 |
U6 |
U7 |
U8 |
U9 |
||
|
Q1 |
Kp ≦ 0.125 |
A1 |
A1 |
A1 |
A2 |
A3 |
A4 |
A5 |
A6 |
A7 |
A8 |
|
Q2 |
0.125< Kp ≦ 0.25 |
A1 |
A1 |
A2 |
A3 |
A4 |
A5 |
A6 |
A7 |
A8 |
A8 |
|
Q3 |
0.25< Kp ≦ 0.5 |
A1 |
A2 |
A3 |
A4 |
A5 |
A6 |
A7 |
A8 |
A8 |
A8 |
|
Q4 |
0.5< Kp ≦ 1 |
A2 |
A3 |
A4 |
A5 |
A6 |
A7 |
A8 |
A8 |
A8 |
A8 |
Ⅳ、Crane working levels under different standards as follow:
|
Crane Working Class & Service Life |
|||||||
|
Standard |
ISO/BS/DIN |
M3 |
M4 |
M5 |
M6 |
M7 |
M8 |
|
GB/EN |
A3 |
A4 |
A5 |
A6 |
A7 |
A8 |
|
|
FEM |
1Bm |
1Am |
2m |
3m |
4m |
5m |
|
|
CMAA |
B |
C |
D |
E |
F |
- |
|
|
HMI/ASME |
H2 |
H3 |
H4 |
H5 |
H5 |
H6 |
|
|
Safe working Period SWP(h) |
400 |
800 |
1,600 |
3,200 |
6,300 |
12,500 |
|
|
Lifting Motor Duty %ED |
25 |
30 |
40 |
50 |
60 |
60 |
|
|
Starts (s/h) |
150 |
180 |
240 |
300 |
360 |
360 |
|
|
Running 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 |
|
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