A seven-junction cooling water intake manifold was studied in a physical
model and by hydraulic analysis. The manifold, also referred to as a "header",
is one of four to be embedded in the bottom of Lake Michigan approximately
3500 ft offshore from the James H. Campbell Plant. Each header supports and
collects water from seven dual screen intake risers (subject of a separate
study). The primary objective of the study was to determine flow contribution
from each of seven risers and piezometric pressures along the header. It was
found that the flow rates ranged from 92 percent to 112 percent of the average
flow per riser. To achieve a higher degree of uniformity, an analysis was
made to determine how much additional headloss had to, be generated in each intake
riser in order to produce identical withdrawal rates in all seven risers.
A similar study was. Made for a partially balanced system where withdrawal rates
would not fall outside the 95 to 105 percent limits. In that case, headloss
generators were required in the two most downstream risers. Sharp edged
nozzles were designed for Risers 6 and 7, and experimentally tested. The total
piezometric pressure change through the partially balanced riser-manifold
system at a total withdrawal rate of 206 cfs was determined to be 13.8 inches
of water relative to the lake. The total energy headloss between the lake and
the downstream end of the manifold was determined to be 10.7 inches of water.
Johnson Division UOP Inc., Consumer Power Company, Commonwealth Associates Inc.
Stefan, Heinz; Shanmugham, Chitra; Dhamotharan, Dhamo S..
Cooling Water Intake Manifold (Header) Study For The James H. Campbell Electric Power Generating Plant, Unit No. 3.
Saint Anthony Falls Laboratory.
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