Compressed air; theory and computations . ctionloss in the air pipe. The length of air pipe in the well and any necessary correc-tions to gage readings must be known. The following order of proceeding is recommended. At the start run the compressor very slowly and note the pres-sure pi at which the gage comes to a stand. This will indicatethe submergence before pumping commences, since there willbe practically no air friction and no water flowing at the pointwhere air is discharged. Now suddenly speed up the compressorto its prescribed rate and again note the gage pressure p2 before THE AIR-LI
Compressed air; theory and computations . ctionloss in the air pipe. The length of air pipe in the well and any necessary correc-tions to gage readings must be known. The following order of proceeding is recommended. At the start run the compressor very slowly and note the pres-sure pi at which the gage comes to a stand. This will indicatethe submergence before pumping commences, since there willbe practically no air friction and no water flowing at the pointwhere air is discharged. Now suddenly speed up the compressorto its prescribed rate and again note the gage pressure p2 before THE AIR-LIFT PUMP 85 any discharge of water occurs. Then p2 — Pi = Pi is the pres-sure lost in friction in the air pipe. When the well is in fullflow the gage pressure p3 indicates the submergence plus friction,or submergence pressure p3 = p3 — pf. The water head in feetmay be taken as X ps. Then, knowing the length of airpipe, the distance down to water can be computed for conditionswhen not pumping and also while pumping. ><7F*~ %i. ^
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