Product Description

Heavy Lifting ship Salvaging MarineRubber Airbags

Product introduction:

Marine Rubber Airbags:

Marine rubber airbags is china independent intellectual property rights of innovative products,
the products are mainly applied to ship launching and landing, weight lifting and moving,
installation of underwater buoyancy aid to salvage sunken vessels etc. Airbags launching technology was developed based on traditional slipway launching mode, it overcomes the restrictions of traditional slipway launching mode. Our marine rubber airbags are less limited by space, no large mechanical equipment, can shorten the working period and save the unnecessary cost. Through years of development practice, our products are become more safety, effective and green environmental protection and they can launching a ship up to 100,000 DWT. Nowadays, Hantian Marine rubber airbags are widely used in the world.

Structure:
Heavy Lifting Ship Salvaging Marinerubber Airbags

"Hantian"Marine Rubber Airbags'structure is consists of the outer rubber layer synthetic cord reinforced rubber layers and inner rubber layer.
Its shape characteristics: central body cylindrical + tapered on both ends.
Cord layers: 4,5,6,7,8,9,10, layers
Accessories: Pressure gage, Inlet valve, Pipe fitting and seal end ring.
1.2 Material
1) Choose the best quality of imported natural rubber, such as smoked sheet rubber and 3L natural rubber form Thailand and Malaysia, which has good elasticity, ageing resistance. And will not take off layer. Meanwhile, During the process of produce rubber, we using efficient stabilizer to make rubber more environment friendly and no cracks.

No	Test item		Required value	Test method
1	Tensile strength, MPa		>=18	ISO 37
2	Elongation at break, %		>=400	ISO 37
3	Hardness, (Shore A)		60±10	ISO7619-1
4	Tear Strength, N/cm		>=400	ISO34-1
5	Compression set, %(70ºC±1 ºC 22h)		<=30	ISO815-1
6	After thermal ageing at 70ºC±1 ºC, 96h	Holding of pull lengthening, %	>=80	ISO188
7		Holding of elongation at break, %	>=80	ISO188
8		Change of hardness, (Shore A)	<=8	ISO7619-1
9	Static ozone aging test at 40ºCx96h		No crack	ISO1431

Our marine rubber airbags' material using three strands synthetic-tyre-cords whose tensile strength can be 31 KG, which make our airbags more higher bearing capacity and safety

Standard size of Marine Rubber Airbags:
    Diameter (D): 0.8m-2.0m
    Effective length (EL): 6.0m-18m
    Total Length (TL): 7m-20m
Cord layers: 4,5,6,7,8,9,10, layers

Diameter(m)		1.0	1.2	1.5	1.8	2.0
Medium Pressure (4-5)	Test Pressure	0.14-0.16	0.12-0.14	0.10-0.12	0.08-0.10	0.07-0.09
Medium Pressure (4-5)	Working Pressure	0.12-0.14	0.10-0.12	0.08-0.10	0.07-0.09	0.06-0.08
High Pressure (6-8)	Test Pressure	0.22-0.26	0.20-0.24	0.15-0.20	0.13-0.16	0.12-0.15
High Pressure (6-8)	Working Pressure	0.20-0.24	0.17-0.22	0.13-0.18	0.11-0.14	0.10-0.13

NOTE: Other size of airbags are also available follow customer's request.
3.Performance curves
3.1 Initial Internal Pressure
Air pressure that fully inflates the airbag before compression (See Figure 3, D). When the airbags are compressed by ship's weight and its diameter will make a change. At the same time, airbag,s internal pressure will crease with its compression rate.

3.2 Percentage deformation:
Ratio of the deformed height to the original diameter of the airbag while the airbag is being compressed.
The compression rate can be calculated using formula (See figure 3):
P=(D-H)/D
Where
P=the percentage deformation(%)
D=the original diameter of the airbag(m)
H=the height of the compressed airbag(m)

X=compress deformation Y=internal compress(kPa)
1=initial pressure 2=rated working pressure
Figure 4.- The compression performance curve for diameter 1.2m(6 layers) airbag
3. Reference for select airbag
How to choose a suitable airbag for your vessels ?
The selection of airbags should be follow the vessel's dimensions, type and launching weight.
Diameter:
The Airbag's diameter should be consider the height of docking blocks. In order to lifting the ship safety, the airbag,s diameter must be higher the docking blocks. Generally, the airbag's diameter should be increased by 0.5m based on the block height. For example, If the docking blocks height is 1.0m, airbag should be choose Diameter not less than 1.5m.

Length:
The selection of airbag,s length depends on the width of vessels. The airbag,s effective length must be ≥ the width of vessels. It will enhance the safety and steadiness of launching.

Airbag,s bearing capacity
The most important factor of ship launching, it must be consider the airbag,s bearing capacity. The airbag,s bearing capacity must be higher than the ship,s launching weight to guarantee launching progress safety. So the number of layers will decide the airbag,s bearing capacity.

4 layers Intensive Airbag for ship launching and landing
Diameter	Working Pressure	Working Height	Bearing Capacity per meter in length
Diameter	Working Pressure	Working Height	KN/m	Ton/m
D=1.0m	0.13Mpa	0.6m	81.72	8.33
		0.5m	102.12	10.41
		0.4m	122.53	12.49
D=1.2m	0.11Mpa	0.7m	86.43	8.81
		0.6m	103.69	10.57
		0.5m	121.06	12.34
		0.4m	138.32	14.10
D=1.5m	0.09Mpa	0.9m	84.86	8.65
		0.8m	98.98	10.09
		0.7m	113.21	11.54
		0.6m	127.33	12.98
		0.5m	141.46	14.42
D=1.8m	0.08Mpa	1.1m	88.09	8.98
		1.0m	100.65	10.26
		0.9m	113.21	11.54
		0.8m	125.76	12.82
		0.7m	138.32	14.10
		0.6m	150.88	15.38
D=1.8m	0.07Mpa	1.2m	88.09	8.98
		1.1m	99.08	10.10
		1.0m	110.07	11.22
		0.9m	121.06	12.34
		0.8m	132.04	13.46
		0.7m	143.03	14.58
		0.6m	154.02	15.70

5 layers Intensive Airbag for ship launching and landing
Diameter	Working Pressure	Working Height	Bearing Capacity per meter in length
Diameter	Working Pressure	Working Height	KN/m	Ton/m
D=1.0m	0.17Mpa	0.6m	106.93	10.90
		0.5m	133.61	13.62
		0.4m	160.30	169.34
D=1.2m	0.14Mpa	0.7m	110.07	11.22
		0.6m	132.04	13.46
		0.5m	154.07	15.70
		0.4m	175.99	17.94
D=1.5m	0.11Mpa	0.9m	103.79	10.58
		0.8m	121.06	12.34
		0.7m	138.32	14.10
		0.6m	155.59	15.86
		0.5m	172.85	17.62
D=1.8m	0.09Mpa	1.1m	99.08	10.10
		1.0m	113.21	11.54
		0.9m	127.33	12.98
		0.8m	141.46	14.42
		0.7m	155.59	15.86
		0.6m	169.71	17.30
D=1.8m	0.08Mpa	1.2m	100.65	10.26
		1.1m	113.21	11.54
		1.0m	125.76	12.82
		0.9m	138.32	14.10
		0.8m	150.88	15.38
		0.7m	163.43	16.66
		0.6m	175.99	17.94

6 layers Intensive Airbag for ship launching and landing
Diameter	Working Pressure	Working Height	Bearing Capacity per meter in length
Diameter	Working Pressure	Working Height	KN/m	Ton/m
D=1.0m	0.20Mpa	0.6m	125.76	12.82
		0.5m	157.16	16.02
		0.4m	188.65	19.23
D=1.2m	0.17Mpa	0.7m	133.61	13.62
		0.6m	160.30	16.34
		0.5m	187.08	19.07
		0.4m	213.76	21.79
D=1.5m	0.13Mpa	0.9m	122.63	12.50
		0.8m	143.03	14.58
		0.7m	163.43	16.66
		0.6m	183.94	18.75
		0.5m	204.34	20.83
D=1.8m	0.11Mpa	1.1m	120.96	12.33
		1.0m	138.22	14.09
		0.9m	155.59	15.86
		0.8m	172.85	17.62
		0.7m	190.22	19.39
		0.6m	207.48	21.15
D=1.8m	0.10Mpa	1.2m	125.76	12.82
		1.1m	141.46	14.42
		1.0m	157.16	16.02
		0.9m	172.85	17.62
		0.8m	188.64	19.23
		0.7m	204.34	20.83
		0.6m	220.04	22.43

Applications & Operation

Ship Launching Process

The ship should be fasten with guy rope or cable attached firmly with the winch.
After the ship fasten with winch, choose a reasonable position near the bottom of bow to insert one or more airbags which act as the fulcrum for winch to move the ship when inflated and life the bow. If it is difficult to insert airbags at the bottom of bow, we can also insert airbags from one side to another side. However, for heavy ship, the quantity of bow lifting airbags should be added until they can lift the bow. For V shape bow ship, the bow lifting airbags should be insert at the position where they can have bigger contact area with the bottom of ship. Beside that, we can also place the airbags at the appropriate positions at low tide and pull the ship upon airbags at high tide, then inflate airbags to lift the ship. In one ward, the ship landing process should be depend on the actual situation.
When the ship,s bow is lifted, people should start the winch to pull ship towards land and insert more airbags to the space between ship bottom and land until the full ship is pull upon the slipway.
Adjust the airbags' pressure to lift ship bottom higher, then insert the docking blocks and withdraw the airbags.

After use, the airbags should be cleaned up and dried in the sun, then they should be coated with talcum powder to store in dry place.

More Applications:
Marine rubber airbags used for heavy lifting and moving
Due to marine rubber airbags has a strong hearing capacity, sometimes they also can be used for heaving lifting and moving.

Salvage Rubber Airbags (Salvage Pontoon) for salvage sunken vessels
Hantian Salvage Rubber Airbag is made of rubber material, which is different from the metal material another equipment. It can produce water buoyancy, the overall sealed, submerged in water can bring huge buoyancy, So it is mainly used for salvage sunken Vessels, floating dock and some other emergency rescue projects etc.

Specification:

Length Dia.	Buoyancy (Tons)
Length Dia.	1.0m	1.2m	1.5m	1.8m	2.0m
5m	3.93	5.65	8.84	12.72	15.71
6m	4.71	6.79	10.6	15.27	18.85
7m	5.50	7.92	12.37	17.81	21.99
8m	6.28	9.05	14.14	20.36	25.13
9m	7.07	10.18	15.90	22.90	28.27
10m	7.85	11.31	17.67	25.45	31.42
11m	8.64	12.44	19.44	27.99	34.56
12m	9.42	13.57	21.21	30.54	37.70
13m	10.21	14.70	22.97	33.08	40.84
14m	11.00	15.83	24.74	35.63	43.98
15m	11.78	16.96	26.51	38.17	47.12
16m	12.57	18.10	28.27	40.72	50.27
17m	13.35	19.23	30.04	43.26	53.41
18m	14.14	20.36	31.81	45.80	56.55

6.Product advantages
1. Advance Manufacturing Technology
Hantian Marine rubber airbags overall frame structure uses cross whole intertwine technology, the overall structure is more reasonable, texture clear, no juncture, high loads, more safety than lap technology (roller), more than 20% bearing capacity.
2.The Best Quality of Material apacit
Our products choose the best quality of imported natural rubber, which has good elasticity, ageing resistance, and will not take off layer. Meanwhile, during the process of produce rubber, we using efficient stabilizer to make rubber more environment friendly and no cracks. Beside that, our marine rubber airbags' material using three strands synthetic-tyre-cords whose tensile strength can be 31KG, which make our airbags have more bearing capacity and safety.

Safety and reliability

All of our products will do the factory test before delivery to our customers. The best quality is our unremitting pursuit. We make sure that all of our products own good performance before package and delivery.

Saving the Cost

Compared with traditional launching slipway, using airbags launching method become more economy for shipyards. So they can saving the cost of launching slide way.

Simple and fast to deploy

Easy operation, marine rubber airbags are designed using principle of rolling wood to lifting and moving heavy weight. It just needs to put airbags under the bottom of ship and then inflate them to lifting and moving vessel. So they are very flexible and save labor time.

Long using life & Environment friendly

Generally, our marine rubber airbags can be used for more than 10 years under normal conditions.
They can be repeated use for a long time. Meanwhile, our marine rubber airbags are environment friendly and they will not bring any pollution to environment.
Package and shipment:
Packing:
All of airbags can be folded and then bundled up
Shipment:
Heavy Lifting Ship Salvaging Marinerubber Airbags