《1-Airamp;CompressedAir-FundamentalTraining》.ppt

* Training cession 2005 Air and compressed air PREVOST The air Training cession 2005 Air and compressed air What is compressed air ? Compressed air is air kept at a higher pressure than the ambient atmosphere Compressed air contains air, but also, oil, water, dust and pollution. When compressed, air always tries to return to the ambient atmospheric pressure.This reaction can be used as a source of energy Training cession 2005 Air and compressed air What is pressure ? Atmospheric Pressure is the difference between the absolute zero (full vaccum) and the pressure at the sea level (1.013 bars, 14.7 psi) Effective pressure is the difference between the ambient atmospheric pressure and the compressed air pressure (this is the measurement we use in our field) Pressure is a force acting on a surface per unit of area Absolute pressure is the difference between zero and the compressed air pressure Training cession 2005 Air and compressed air Bar x 1.019= kg/cm2 Bar x 100.00 = pa Kg / cm2 x 0.981 = bar Bar x 14.5 = psi Kg / cm2 x 0.07 = psi Psi / 14.5 = bar 1 pound = 453.6 g What is pressure ? Training cession 2005 Air and compressed air What is flow ? Flow is the measurement of the quantity of fluid or gas going through a certain section and for a certain time Flow can be mesured in scfm, m3/h, m3/mn, l/h, l/mn, l/s, etc… Flow can be the measurement of the produced air (from the compressor) or of the consumed air (by the tool ) Training cession 2005 Air and compressed air What is the pressure drop ? _ _ _ _ _ P 1 P 2 Compressed air Atmospheric pressure DP is the difference of pressure between P1 and P2 If P1 = P2 then the flow is 0. If P1P2 then the flow is 0. The more opened is the valve , the lower is P2 and the higher is ?P and the flow. Training cession 2005 Air and compressed air CV x 7 = m3/h KW x 10 = m3/h CV = H P x 1.01