Specially designed marine airbags for heavy lift and transport projects with enhanced thick outer layers and cone ends, good abrasion and distortion resistance. Super lifting capacity but low pressure imposing on structure. Six time safety coefficient. Heavier and tougher than normal ship launching airbags. Widely used for LPG,LNG tank lifting, caisson lift and moving, structural relocation projects.
Heavy lifting bags Details
Item Pneumatic Lifting airbags
max. working pressure 2.5 / 0.25 (bar/Mpa)
max. lifting capacity 5000 / 500 (kN/T)
max. inflation height 2000 mm
thickness incl. profile 30 mm
Insert height 200-300 mm
material reinforced with multiple nylon layers
Safety coefficient at least 5 times
connection Custom made
Dimensions, weight and temperature
weight, ready for use 100-1000 kg
thread hole M6 thread size
temperature range -20 + 55 °C
Package for shipment Deflated and fixed to pallet
Marine Heavy lift airbag (D 1.5 M x L 10 m, 6 plies)
Performance data of other sizes heavy lift air bags are available upon request.
Marine heavy lift airbags are normally deployed to handle with heavies of hundreds or thousands tons. Some successful using in different fields:
Guidelines of heavy lift airbag using : http://eversafemarine.net/guidelines-of-using-airbags-for-heavy-lift-and-structural-moving-1-new-solution-for-caisson-culverts-lifting-and-moving/
The Evergreen heavy lift bags are powerful tools for our lift and transport projects.The heavy duty design make them always reliable.
Stephen Christian, P.Eng.
Those pneumatic rollers are amazing versatile. They can lift thousands tons weight with low pressure,thus being very useful for floating structure lifting and transport.
Structure relocation or heavy load out with airbags is the extended application of airbag ship launching/docking technology. Airbags have big contact area with transported objects bottom thus they have low impact on structure. Airbags can lift thousands tons heavy up, can move heavy into water or out of water, regarding this character its advantage is peerless.
SPMT stands for self-propelled modular transporter, a platform vehicle with a large array of wheels; it is equipped with Power Pack Unit which provides the propulsion.
The SPMTs consist of four-axle units or six-axle units, the maximum allowable axleline payload is 30 tons per line.
|Airbag specification||Load||Lifting height||Airbag pressure|
|1.0 ×15 m||471 tons||0.5 m||4 bar|
|1.5 ×15 m||235 tons||1.0 m||2 bar|
|2.0 ×15 m||420 tons||1.0 m||1.8 bar|
Deflated airbags can be inserted into 20 cm height space. The lifting distance can reach 1.5- 2 meters.
The trailerdeck of Kamag and Scheuerle SPMTs can be lowered to 1.2 m, so they can only be driven into higher space. The lifting distance of SPMTs is about 50-60 cm.
|Allowable Structure shape||Frame work, irregular shape||Flat bottom|
|Assistant equipment||No||Pulling system|
|Load distribution||Load can be kept flat and evenly distributed automatically||Load can be kept flat and evenly distributed manually|
|Speed||Less than 1.6 KM per hour||Less than 0.6 KM per hour|
Each individual wheel can swivel independently from other wheels so SPMT can turn, move sideways, or even spin in place.
Marine airbags heavy transport can also be steerable by manual adjusting airbags inclined angles. Obviously this performance is not as convenient as SPMTs do.
From theory calculation the possible steering radius of airbags and SPMTs of load transport should be same. Considering load capacity/meter of SPMTs is not optimal, SPMTs steering radius should be bigger than marine air bags.
SPMTs often move at under one mile per hour while fully loaded.
Marine airbags heavy transport speed is decided by the winch speed which is often less than 0.6 KM one hour.
In a conclusion, SPMTs is good at heavy load out or transport. Marine airbags heavy transport only suit for regular structure with possible flat bottom and short distance transport.
As mentioned before marine airbag is not a high developed industry product but that can not cover its advantages for some heavy lifting and transport or load out applications. Such as concrete caissons load out projects, marine airbags are found to be most convenient and economical method to be used. Marine air bags can roll a load into water directly which can even save the semi submersible barge. Steel cofferdams weighing 3000 tons had been transported from construction spot to river bank and launched successfully.
The SPMT is a classic solution for heavy load transport. It is versatile, extendable and often the only viable solution for large structures. However, the classic SPMT has some drawbacks: it is ill suited for indoor operation due to its combustion power source. It has a high deck height, making access to the cargo difficult or requiring extra lifting systems to put the load onto the SPMT. It’s load capacity/meter is not optimal and it needs a lot of space. Many SPMT types are not fully omni-directional and it is not easily automated. Their hydraulic circuits of the hydraulic motors experience high pressure peaks which often lead to oil leakage, the same goes for the hydraulic suspension. The classic SPMT requires a high maintenance schedule resulting in high costs. On the whole they come to be not cheap.