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Hydraulic jack
A hydraulic jack is a mechanical device used as a lifting device to lift heavy loads or apply great forces by the help of fluid, which is can't be compress, that is forced into a cylinder by a pump plunger. Oil is used since it is self-lubricating and stable.

Working principle:- Hydraulic jack is based on Pascal’s law, which states that intensity of pressure is transmitted equally in all directions through a mass of fluid at rest.

Let W= Weight to be lifted, F = Force applied on the plunger, A = Area of ram, a = Area of plunger.

Pressure intensity produced by the force F, p = F/(Area of plunger ) = F/a.

As per Pascal’s law, the above intensity p will be equally transmitted in all directions.

Therefore, The pressure intensity on ram = p = F/a = W/A or W= F[A/a ].

Above Equation indicates that by applying a small force F on the plunger, a large force W may be developed by the ram.

Mechanical advantage of press = A/a

If the force in the plunger is applied by a lever which has a mechanical advantage (L/l) then total mechanical advantage of machine = (L/l)(A/a)

The ratio (L/l) is known as leverage of press.

Types
Based on requirement and working statues the following major type of hydraulic jack is available:-

1)Bottle jack

A bottle jack or whiskey jack is a hydraulic jack which resembles a bottle in shape, having a cylindrical body and a neck, from which the hydraulic ram emerges these jack are attached hand operated pumping unit capacity 5 to 200 ton .these jacks are superb in their versatile performance with plain ram or screwed ram with safety lock nut arrangement.

2)Hydraulic Jack (Ship Type)

These Jacks are remote controlled type with detached hand operated pumping unit, Capacity 5to 1000  Ton. These are  superb  in  their  design,  practical,  solid,  reliable, compact,  lightweight   and  versatile  performance with plain ram or screwed ram with safety  lock  nut  arrangement.The jacks  are  provided with hand operated &Motorized power packs..

3)Floor Jacks

Unlike bottle jack shafts, the shaft in a floor jack horizontal—the shaft pushes on a crank that connects to a lifting pad, which is then lifted horizontally. Floor jacks typically provide a greater range of vertical lift than bottle jacks, and are available in two sizes. The original jack is about four feet long, a foot wide, and weights around 200 pounds—they can lift 4-10 tons. A more compact model was later made, which is about three feet in length, and can lift 11/2 tons. Although “mini jacks” are also produced, they are not a recognized standard type of floor jack. Typically, one of the first two sizes should be used.

Application

Hydraulic jack and cylinders are the most commonly used in heavy industry and power equipment that require tremendous power to operate. You can find these hydraulic jacks in all types of heavy machinery and vehicles such as excavators, forklifts, elevators and excavators etc. Car jack and garage jack.
 * The hydraulic jacks are typically used for heavy loads of life in industrial processes.
 * The Floor Jack are used to lift cars, while replacing the flat tire. This process scan also be done by using
 * The hydraulic jacks are also used in earth-mover to handle heavy loads example bucket wheel, mining truck (biggest truck in the world)
 * they also used in moving mega structures like tank or house.

Hydraulic jacking system to lift tank

Auto floor jack, automotive floor jack and jack is the most reliable and fail safe device it is the safeties way to lift the tank because we can distribute the load in many jacks and equal distribution occur easily in hydraulic jack system only(because pressure will distributed equally in all hydraulic cylinder through the reservoir ) and it can bear heavy load.