Hydraulic and Pneumatic Accessories:environmental fluids

environmental fluids

The environmental effects of hydraulic leaks can be large. Leaked oil permeates down through the ground, eventually reaching the water table where it can spread beyond the boundaries of the offending plant. The growing interest in the environment has therefore led to the introduction of hydraulic fluids with minimal environmental impact. There are two considerations: toxicity, which is the harm that fluid can cause to animals and plants, and biodegradability, which describes the speed at which the fluid changes to innocuous products.

Three different base oils are used as environmentally safe hydraulic fluids. The commonest, and cheapest, is vegetable oil (such as rape seed oil). This has excellent natural biodegradability. In most environmentally sensitive applications vegetable oil is the main choice.

Other oil types are polyglycols and synthetic esters. These are more expensive than vegetable oil, markedly so for synthetic esters, and are not as environ- mentally friendly. They are used where the characteristics of vegetable oil, such as a limited temperature range and poor water tolerance, preclude its use. They can also be used as a blend with vegetable oil.

Whichever base oil is used additives will still be required to provide lubrica- tion, reduce foaming, etc. These additives must also have low toxicity and be biodegradable.

Related posts:

Case studies:Variable speed drives on heating, ventilating, air conditioning {HVAC) system pumps.
Control principles for variable speed pumping:Speed variation for positive displacement pumps
Air flow rate evaluation:Volumetric flow rate
Erosive wear:Industrial solutions and practical issues
Multiple use systems:Multiple material handling and Air supply control.
Operating problems:Rotary valves and Flow control
Operating problems:Rotary valves and Flow control
Material related,Angel hairs and Coating of pipelines.
Hydraulic motors:Piston motors.
LINES, FITTINGS, AND SEALS:FLEXIBLE HOSE
Hydraulic Pumps and Pressure Regulation:loadIng valves
BASICCONCEPTS OF THE RMODYNAMICS:STATE AND EQUILIBRIUM
ENTROPY:THE ENTROPY CHANGE OF IDEAL GASES
ENTROPY:MINIMIZING THE COMPRESSOR WORK
RADIATION HEAT TRANSFER:THE VIEW FACTOR

Leave a comment

Your email address will not be published. Required fields are marked *