By Jones, Garr M.(eds.)

With the addition of four Interactive Tables and 178 Digitized Graphs the 3rd variation of Pumping Station layout maintains the award-winning culture of prior releases of this product. Written through forty four authors with specialist enter from 141 different participants for brands, application managers, layout engineers environmental engineers and all considering the layout of pumping stations, this booklet presents professional info. figuring out is given to a few of the disciplines very important to the layout and execution of trustworthy, effortless to function, low upkeep pumping stations. The intensity of expertise and services of the participants and editors is extraordinary making this publication the traditional advisor for the implementation of a well-integrated pumping station layout.

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Velocity can also be expressed as flow rate, Q, divided by water cross-sectional area, A. Substituting and rearranging Equation 3-9 yields another, somewhat more convenient form. In SI units, "    1:85 # Q 151Q 1:85 hf = 10,700 DÀ4:87 = (3-10a) C CD2:63 where hf is meters per 1000 m, Q is cubic meters per second, and D is pipe diameter in meters. Values of C are given in Table B-5 (Appendix B). S. 5 "    1:85 # Q 149Q 1:85 hf = 10,500 DÀ4:87 = (3-10b) C CD2:63 where hf is feet per 1000 ft, Q is gallons per minute, D is pipe diameter in inches, and C, again, is given in Table B-5 (Appendix B).

In diameter is typically given as 130. A Class 56 pipe carries 94% as much water, so its C value should be 122, but such a listing is unlikely to be found. The ratio of actual to nominal diameter accounts for the difference between the published C values for ductile iron pipe (DIP) and steel pipe with its smaller bore when both are lined with cement mortar. 7 . . ). For smaller smooth pipes, C varies from 130 to 140 depending on diameter. C values from 100 to 150 are applicable in the transitional zone (between laminar and turbulent flow), but the scale effect for different diameters is not included in the formula.

17 a Depth v2/2g y dA = bdy dy Es y y Tranquil flow Shooting flow yc o b E a b Figure 3-5. Energy in open channel flow. (a) Specific energy for constant flow rate; (b) channel cross-section. at critical depth. Substituting vc = Q=A gives v2c A = 2g 2b (3-23) at critical depth. Note that b is the width of the water surface—not the average width. One illustration of the usefulness of Equations 3-22 and 3-23 is the application to open-channel Venturi flumes for measuring flow rate. Any obstruction in the channel that produces a short length of uniform flow with straight, level streamlines at critical depth can be a Venturi flume.

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