Evergreen marine airbag’s performance is different when it is slow or quick compressed. Slow compression is treated as isothermal compression and quick compression regarded as adiabatic compression. In the practical calculation, people take airbags’compression as dynamic compression when ship moves into water with airbags and in heavy lifting process regard it as static compression.
Marine airbag’s performance curve achieved by experiment :(1.5m diameter, 6 layers, initial pressure 0.13 MPa)
Performance table of Eversafe Marine airbags (6 layers type)
|
Diameter
|
Working Pressure
|
Working Height
|
Guaranteed Bearing Capacity
|
|
|
Static Compression Ton/m
|
Dynamic Compression Ton/m
|
|||
|
D=1.0m
|
0.20 Mpa
(29.01 psi) |
0.7m(2.296 ft)
|
11.0
|
11.6
|
|
0.6m (1.968 ft)
|
16.48
|
18.1
|
||
|
0.5m (1.640 ft)
|
24
|
27.9
|
||
|
0.4m (1.312 ft)
|
35.4
|
44.2
|
||
|
0.3m (0.984 ft)
|
54.7
|
75.1
|
||
|
D=1.5m
|
0.13 Mpa
(18.85 psi) |
0.9m (2.952 ft)
|
16.7
|
18.6
|
|
0.8m (2.624 ft)
|
21.8
|
25.2
|
||
|
0.7m (2.296 ft)
|
28.4
|
38.3
|
||
|
0.6m (1.968 ft)
|
37.4
|
47.5
|
||
|
0.5m (1.640 ft)
|
50.3
|
67.9
|
||
|
0.4m (1.312 ft)
|
70.1
|
101.8
|
||
|
D=1.8m
|
0.11 Mpa
(15.95 psi) |
1.2m (3.608 ft)
|
13.1
|
14.2
|
|
1.1m (3.280 ft)
|
16.5
|
18.4
|
||
|
1.0m (2.952 ft)
|
20.7
|
23.8
|
||
|
0.9m (2.624 ft)
|
25.9
|
30.9
|
||
|
0.8m (2.296 ft)
|
32.6
|
40.4
|
||
|
0.7m (1.968 ft)
|
41.4
|
53.6
|
||
|
0.6m (1.640 ft)
|
53.4
|
72.7
|
||
|
0.5m (1.640 ft)
|
70.6
|
101.9
|
||
|
D=2.0m
|
0.10 Mpa
(14.5 psi) |
1.2 m (3.936 ft)
|
17.7
|
19.9
|
|
1.1 m (3.608 ft)
|
21.7
|
25.2
|
||
|
1.0 m (3.280 ft)
|
26.7
|
31.9
|
||
|
0.9 m (2.952 ft)
|
32.9
|
40.7
|
||
|
0.8 m (2.624 ft)
|
40.8
|
52.6
|
||
Performance data of marine air bags with 4,5,7,8 plies are available on request.
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