Bladders usually this term has been used in medical field Gallbladder is the term which is quite common in the field of medicine. Ok in order to understand the concept of a bladder in the world outside the world of medicine, bladder is in a certain shape inside the human body which contains whatever the purpose is, anyways bladder is also used for the storage of fuel. Definitely not human bladder is used for storage of fuel but something with a shape of bladder is used for fuel storage. Fuel preservation is something important in factories, industries and other manufacturing environment, because certainly the looms, machines and other stuff are running on fuel and hence this is something really important.
These bladders are inflatable, portable, occupies less space and extremely flexible the major point of having a bladder is flexibility and because it provides ample space in an industrial environment. These pillow shaped bladders are used to store good quantity of liquid, any kind of liquid can be stored very easily. Fuel bladder is just the name given to this mechanism but in real it is required to store the water, fuel and other liquid substances (not harmful or toxic acids). The concept of fuel bladder is driven from the same concept of gallbladder because a gallbladder has the ability and capacity to store much amount of liquid without being busted. Bladder for fuel store concept was taken from the fact that historically water bottles used to be in a bladder shape and used to carry a lot of water inside that bottle. Water bottles at that time was not the same as Today (there was no plastic hard plastic bottles available).
The normal standard size of a bladder is 80 to 100 gallon (specifically US gallons) there are larger fuel bladders Australia available too but roughly above 50K gallons increases the risk of spilling. In order to prevent this situation; bladders are conserved in a separate container (so that if something spills, actual fuel must not be wasted and spilled out of the container). Along with these benefits bladders have some severe disadvantages too like the before mentioned issue; fuel bladders if not handled properly can cause some serious damages and destruction because God forbid if something happens and a bladder busts it will spill gallons of liquid at once which can wave almost anything. There are certain guidance according to which one has to use the secondary container (there are some specifications and features which one has to understand before preserving anything in secondary container). Bladder is a wonderful concept to store the fuel but one cannot rely on the quality and preservation of the bladder totally.