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Unformatted text preview: nternational Organization for
diffuser: Throat tap θ < 15° D
2 0.7d d
(c) 1. Corner taps where the plate meets the pipe wall
2. D: 1 D taps: pipe-wall taps at D upstream and 1 D downstream
3. Flange taps: 1 in (25 mm) upstream and 1 in (25 mm) downstream of the plate,
regardless of the size D
Types 1 and 2 approximate geometric similarity, but since the flange taps 3 do not,
they must be correlated separately for every single size of pipe in which a flange-tap
plate is used [30, 31].
Figure 6.40 shows the discharge coefficient of an orifice with D: 1 D or type 2 taps
in the Reynolds-number range ReD 104 to 107 of normal use. Although detailed charts
such as Fig. 6.37 are available for designers , the ASME recommends use of the
curve-fit formulas developed by the ISO . The basic form of the curve fit is 
where f( ) 91.71
f( ) 2.5 ReD0.75 0.5959 0.09
2.1 0.0312 4
0.184 0.0337 3F2 (6.132) 8 The correlation factors F1 and F2 vary with tap position: | v v Corner taps: | e-Text Main Menu | F1 0 Textbook Table of Contents F2 | 0 Study Guide (6.133a) 400 Chapter 6 Vis...
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This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.
- Spring '08