G-Bag: Gravity bags designed
for breech filling in active water environments. G-bags are
available in 4 capacities, and each capacity series can be equipped with
either a depth or time based activator. Depth activators can be
programmed to activate at a continuous range of external water
pressures. Time activators can be programmed to activate
based upon a pre-set timer.
The G-bag principle is to provide;
1. Robotic activation:
The devices can be pre-deployed to reach automatically to changing
2. Mass expansion from local resources:
G-bags can increase their mass as much as 1000:1 using the static mass
of a targeted fluid, such as flood waters. One car or container
load could protect an entire small town.
G-bags are designed to be easily transported, or
stored. The principle design feature is that a G-bag is a
ballast-able, evacuated, bladder composed of multi-layered Kevlar, which when deployed will be activated
at a key depth. Once deployed and activated the G-bag will
automatically fill with water and therefore be strategically held in
position by gravity.
G-bag activators are simple and highly reliable. Depth [pressure]
activators depending on applications can be set at the factory or in the
field. For most deep water applications, (below 100 ft), the
activator is a simply a tight plug that will naturally compress, by
water pressure, at the target depth [pressure]. Submersion, and
timed activators are also available.
G-bags are designed to replace other methods of
fluid flow management such as sand bags, cofferdams, etc.
However G-bags provide significant advantages over many other methods in
that they are fluid ballasted, and can therefore be ballasted as needed
at the construction site. G-bags also allow for strategic
automatic ballasting, which is useful in breeching in active
environments. The fluid ballasting also facilitates quick, easy
and environmentally sound de-ballasting so that G-bags can be easily
removed once tasks are completed.
The G-bag design also facilitates accurate
placement via tethers or robotic vehicles.
Shell materials options include bio-degradable plastics, reusable
plastics, and e-glass fiber.