Document 3mmYQd0583JqN6NV9r3oNBjx

Site Face to face., ........ ....................................................... 1 Center to facet................................................................. | Center to face o f lone radius e lls......................... .Center to face o f 45*deg. e lls........................................ Face to face laterals........................................................ Center to face................................................................... 1 Pa m 1 fcn fn<*A fm iim r ......................................................... Center to face............... ...................................................I .. . Diameter o f flange................................................ . .. Thickness o f flange..................................... .................... Diam eter o f b o lt circle ................................................... No. of b o lts ........................... ........................................ Diam eter of b o lts ............................................................ ; M in im u m m etal thickness of b o d y ............................... Am. Soc. of Heat.-Vent. Encineers Guide, 1922 Q RXj*0XQOXRXroOtObX-04X--<OeO^X *< op **XrttX-co o XXoo co **X C* o M X<0X<0 X10 X0 C4 -rC-t ^XceXX o X XXX XX X* oo ooo^Xoe^Xt-X^--XeoX-*Xo0 XX h XXXXX X-CX XX twooojog2^`S2"*200 <0 <oaoX^ooXo*Xcoc>^^XoaoX-C sabs sx tOt-o-*t-<oeoaoo oo oo X ** X XX XXX(Xw00XX - CO0O lOWCOb- twOO X n XXXX XXX X-C cucococo**--eoooo n 'f co -ofr-eoc0eo<0r- X-t * . N O *01- CO M 9 C4 tX4X41 x-c C* Oj XRj X0X4 XCO X04 *** X ao**<0O4r-e us co** t--GO *0 04 00** o* co** - X XXXX -e 0* co** Am. Soc. of Heat.-Vent. Encineers Guide, 1922 13 report of committee on standardization of the use of THE PITOT TUBE (Transactions, Vol. XX, p. 210) The Committee rendered a careful report which included two tables and a list of references on the theory of the Pitot tube and the derivation of formulae. An extract from the report is given below. "The reading should be taken at a cross section where the pipe is straight and the (low undisturbed. This should be preferably at least 10 diameters from the fan outlet, from an elbow, or from a change in cross section in the duct. The readings should be taken over a plane at right angles to, and the tube should be pointed in a direction parallel to, the direction of the air flow. .The most difficult reading to take accurately in a current of air is the static pressure. The approved form of static tip shown by diagram B, is the form recom mended for fan-testing work. There should be eight or more clean holes 0.02 in. in diameter, an equal number on each side of a J4-m. tube 1/32 in. thiok. The most approved form of Pitot tube combines the foregoing static tip with an impact tube as shown by diagram C, by means of which total, static, or velocity pressure may be read. Approved Form of Static Tip "B" Pitot Tube "(T In making a traverse of a rectangular duct, the cross sectional area may be divided into a number of smaller rectangles and a reading taken in the center of each small rectangle. A round pipe should be divided into at least three concentric zones of equal area per foot in diameter and four readings taken on a circle drawn through the center of area of each zone or ring.