MadSci Network: Engineering

Re: How come hydrolics are pressurized more than air

Date: Sat Apr 15 13:21:47 2000
Posted By: Bob Gibilisco, Staff, Process Engineering, Retired
Area of science: Engineering
ID: 954058057.Eg


The selection of the type of system to transfer energy from an energy source (e.g. Pump) to a device that will perform work (e.g. Linear cylinder ram) is based upon a number of considerations: Cost, Speed of Operations, Available Energy, Weight, Size, Cleanliness, etc. Part of the design criteria includes the properties of the fluid (air, oil, water etc.) used to transfer the energy. Hydraulic oil (Mineral oil or paraffin based oil) is much more dense than air: Hydraulic Oil = 57 Lb. Per cubic foot (1) Air = 0.075 Lb. Per cubic foot (2) Either fluid can be compressed to very high pressures. Since hydraulic oil is not as ģelasticī as air, oil is generally used for heavy-duty operations such as the steel industry for forging, rolling and cold forming operations. Air is used generally used in lighter-duty operations such as the food industry, medical field and other lighter duty manufacturing applications. . I hope this provides some insight on the use of fluids in transferring energy. Ref: (link defunct as of 7/20/2006)

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