Page 130 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

114 Applied Process Design for Chemical and Petrochemical Plants

Fluld Flow
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B ase on H ams F ormu a t Qp - da.:s, Re , psi
L : Pipe Length , feet
Re= Ratio of Compression !from free air) at Entrance of Pipe
d = I. D. , Inches
V : Air Flow, cu. ft./sec. ( free air)
Figure 2-37. Compressed air flow chart. By permission, Walworth Co. Note: use for estimating only (this author).
Y = net expansion factor for compressible flow For example, for a line discharging a compressible fluid
through orifices, nozzles, and pipe [3] (see Fig- to atmosphere, the b.P is the inlet gauge pressure or the
ures 2-38A and 2·38B) difference between the absolute inlet pressure and atmos-
�p = pressure drop ratJo in M /P', used to determine pheric pressure absolute. '\,\,'hen �p /Pi' falls outside the
Y from Figures 2-38A and 2-38B. The �p is the limits of the K curves on the charts, sonic velocity occurs
difference between the inlet pressure and the
pressure in the area of larger cross section. at the point of discharge or at some restriction within the
di = pipe inside diameter, in. pipe, and the limiting value for Y and �p must be deter-
C' = flow coefficient for orifices and nozzles (Figures mined from the tables on Figure 2-38A, and used in the
2-17 and 2-18) velocity equation, v 5, above [3].