By W. J. Clark
Move dimension via Square-edged Orifice Plate utilizing nook Tappings bargains comprehensively with the topic of stream size via pipes via a sq. aspect orifice plate utilizing nook tappings. the item is to give in simply readable and appropriate shape a attention of the entire many components enthusiastic about actual size, hence permitting readers to understand what's thinking about solid circulate metering perform, to layout if wanted their very own installations to predetermined criteria of accuracy, and to make trustworthy exams of current installations.
The ebook is prepared into 4 elements. half 1 discusses simple ideas, licensed layout and set up stipulations, and suggested follow-up upkeep for numerous predetermined criteria of accuracy, with targeted cognizance given to necessities interested in the metered fluid, operating stipulations, orifice layout, pipe structure and pipe stipulations. half 2 bargains with the sensible program of half I and describes the tactic of utilizing a Flowmeter facts Sheet in particular designed either to make sure that the varied components serious about actual circulate measurements are taken under consideration. half III comprises a couple of consultant and well-detailed specimen calculations designed to demonstrate and make clear all facets of the tactic of calculation endorsed partly II. partly IV a large amount of suitable facts at the actual homes of fluids, and lots of tables, graphs and alignment charts are assembled jointly for simple reference while making orifice calculations.
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Example text
The point of intersection of a horizontal line through 5-6 with the Z Re correction curve for m = 0-5 then gives a ZRe value of 1 -027. (b) Using the ReD Slide-rule if available For the above example align 2 on the D scale with 1 on t h e y scale and read off ZRe where the horizontal line through 30 on the h scale intersects the ZRe correction curve for m = 0*5. To cover possible errors in the data from which the chart has been constructed, a supple mentary tolerance (XRe) of ±25(Z Re — 1)% should be allowed.
Figure 29 a and b — Ά general alignment chart giving values ofy in terms of density and viscosity for gases and liquids. g. to within 5% when ZR = 1 -04 and to within 10% when ZRe = 1-01. As an example of the method of determining Z Re , take the case of water flow at 10°C through a 2 in. pipe using an m value of 0·5 and a pressure-difference of 30 cm of water. (a) Using Figure 23 First determiney; this is given for water at 10°C on Fig. 23 as 1. Next measure off with a pair of dividers or a straight edge the vertical distance between the value of the pipe size (2) on the D scale and the value ofy (1) on they scale.
2 Measurement A considerable number of industrial meters are available for pressure-difference measurement. Those in most common use are in principle differential U-tube liquid manometers but there is an increasing demand, in special cases, for bellows-type meters incorporating pneumatic or electrical transmission systems. Examples are: (i) A simple vertical U-tube with limbs of unequal cross-sections so that the change in liquid level due to the application of a pressure-difference is substantially in the narrow bore limb only; this limb is transparent so that changes in the pressure-difference can be observed directly.