Page 96 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

80 Applied Process Design for Chemical and Petrochemical Plants
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6 IN DEGREES
RESISTANCE COEFFICIENTS FOR INCREASERS AND DIFFUSERS
Figure 2·16. Resistance coefficients for increasers and diffusers for water. Reprinted by permission, Hydraulic Institute, Engineering Data
Book, 1st Ed., 1979, Cleveland, Ohio.
Sudden Enlargement or Contraction [2] For sudden pipe system contractions as represented in
Figure 2-12A through 2-16, the values of the resistance
For sudden enlargements in a pipe system when there coefficient, K, can be read from the charts. For more
is an abrupt change from a smaller pipe flowing into a details for various angles of enlargements and contrac-
larger pipe, the resistance coefficient, K, is given by: tions, see References [3] and [2].
For sudden enlargement:
For sudden contractions:
(2-28)

where subscripts 1 and 2 refer to the smaller (upstream)
and larger pipes respectively [3], (2-36)
or,

hr= K (v 2 /2g), ft of fluid, friction (2-27) Note: Subscripts 1 and 2 indicate small and large pipes
respectively.

(2-35) (2-27)