We are all surrounded by hydraulics every day. You will find hydraulic system in our cars and trucks. In plant, machinery and construction equipment.
Hydraulics is a technology and applied science using engineering, chemistry, and other sciences involving the mechanical properties and use of liquids. At a very basic level, hydraulics is the liquid counterpart of pneumatics, which uses gases.
The basic rule of using hydraulic power is Pascal's Principle. Pascal's Principle: pressure exerted on a fluid is distributed equally throughout the fluid.
This law states that if pressure is applied to a fluid that is confined in a small space, that pressure will be transmitted through the fluid in every direction without diminishing. When it hits the edges of the confined space, the pressure will then act against that space at right angles. Basically, a force acting on a small area can generate a proportionally bigger force on a bigger area.
Most hydraulic systems must store fluid under high pressure.
Three kinds of hazards exist: burns from the hot, high pressure spray of fluid; bruises, cuts or abrasions from flailing hydraulic lines and hydraulic injection of fluid into the skin.
A person noticed a damp, oily, dirty place near a hydraulic line. Not seeing the leak, the person runs a hand or finger along the line to find it. When the pinhole is reached, the fluid was easily injected into the skin as if from a hypodermic syringe.
Immediately after the injection, the person experiences only a slight stinging sensation and may not think much about it. Several hours later, however, the wound begins to throb and severe pain begins.
By the time a doctor is seen, it is often too late, and the individual loses a finger or entire arm.