Laserfiche WebLink
AIR V <br /> WITH THE DWYER FITOT T E <br /> . AiR VELOCITY <br /> The total pressure of on air stream flawing in a duct is the sum of the static or bursting pressure exerted <br /> Upon the sidewails of the duct and the impact or velocity pressure of the moving air Througp the use of a <br /> Pitot tube connected differentraily to a manometer, the velocity pressure alone is Indicated and the car. <br /> resconaing air velocity determined <br /> For accuracy of plus or minus a,as in laboratory applications, extreme care is reouirea and the following <br /> precoutions snouto be ooservea <br /> 1 Duct a:arneter 4" or greater <br /> 2 Maice an accurate traverse oer sketch at —1. <br /> rianr cmeviate the velocities arta av- , <br /> erace •re readings <br /> "oviae smooth stralant cuct sections <br /> r <br /> a "i,nimpm or 8'2 aiameters ,n ienaTn <br /> uestream arta 1 sz aiameters sown- <br /> scream rrorn the pitot tube <br /> d P-ovine an egg crate type stroiantener <br /> upstream Tram the picot tube <br /> In malting an air velocity check select a location as suggested above, connect tubing leads tram oath ortat <br /> tube connections To me manometer and Insert in the duct with the tip directed into the air stream if the <br /> manometer snows a minus Indication reverse the tunes lVith a direct reading manometer, air velocities wtil <br /> new oa snown in Teat car minute In Omer Types the manometer will read velocity Pressure in Inches of <br /> water and the corresponding velocity will be round from the curves In this busletin if circumstances do <br /> not permit an accurate traverse center The Bitot tube in the duct, determine the center velocity and multi• <br /> Ply my a tactor or 3 for the approximate average velocity Field tests run in this manner snouid be cc. <br /> curate within plus or menus 5%. <br /> The valoeity Inarealea Is for ary au at 10aF 19 9 Saromvtne Pressuro and a resulting density of 075 , <br /> cu rt For air at a temoerature othor than 73OF roter to thv curves in this bulletin For other variations <br /> from These conaitians corrections may ors posed upon this tollowing pato <br /> Air yelocrty= 1096 2N P! <br /> �nere Pv—verdcrty pressure in Inches of water <br /> D=Air density in ::/cu ft <br /> Air Density— 1 315 x T <br /> wnere Ps =Barometric Pressure on inches of mercury <br /> T= Absolute Temperature (Indicates temperature F <br /> plus 460) <br /> Flow ,n cu ft per min =Duct area in square feet x air veiocay in ft <br /> per min <br /> AIR vELOC1TY STAINLESS STEEL <br /> CALCULATOR P1TOT TUBES <br /> Carnburas veracity based ,a Test cenhnnoic unity ca <br /> an air density carrectea - eet,Crent alta Irfetrme can. <br /> for eonamons or iernoero. structten at No 304 sworn. <br /> "'•�� �.� cure dna pressure Clem,• less steer Inen graerr- <br /> i Hare■ rea+euf Cartes Orions snow death or In <br /> Orions Ronde■ tram L.J. se+t+elt -or *raver s,nq <br /> +o rf) ..ate► corrrsoena. Comoros —On AMCA dna <br /> nq to 400 to Ari 000 FZ3at AyryRAE saserricat.ens <br /> Furn,anea w,tn earn Direst 5 fes 12 a oo dnq <br /> tube Mane or h seo mount n q <br /> "OL. <br /> ^�xso in u SA B 92 — - �- Godyrrgrit 1992 Dryer wAtrivner+n Inc <br /> D W V E R INSTRUMENTS , INC. Tetehons i MWS-8o00 <br /> P 0 SOX 373 • MICHIGAN CITY, INDIANA 46360, U S.A. Fax 2191872 9067 <br />