Piping roles as the main bridge between membrane modules and
relevant pumps in membrane water
treatment plants. The pipes deliver only water, both
water and air, only air or chemicals (alkaline or
acid detergents) from the pumps to the membranes,
depending on the operation modes of the
membrane. Various fluid phenomena occur in the same
piping with different phases flow, forward and
reverse directions of flow and high and zero velocity
of a fluid. Therefore, the vibration of membrane
plant piping can be induced by flow, acoustic
resonance, mechanical excitation, resulting in a
significant risk in the integrity and safety of the
system. This study evaluated flow analysis for vibration
diagnostic and evaluation of the fatigue in the
microfiltration system applied for a drinking water
treatment plant. The vibration of the main membrane
pipelines was measured to identify the source of
vibration. Also, natural frequency and fluid dynamics
were calculated by computational fluid dynamics.
It showed that maximum magnitude frequencies were at
12Hz and 22Hz, respectively at the water
and air pipeline during filtration and backwash. The
backwash process caused mainly vibration on the
backwash water pipe. The calculated frequency from
analysis of frequency response and CFD was in
a good agreement with the measured frequency. Fatigue
analysis showed that pipelines were getting
little damage caused by vibration. Fatigue lifetime was
predicted more than 15 years under the
operation condition of daily filtration, and more than
27 years under the operation condition of a daily
backwash mode, resulting in minor damage on the pipe
lifetime .
Author
(s) Details
Heekyong Oh
Engineering Solution Team, Daewoo E&C, 170 Eulji-ro, Jung-gu,
Seoul, Republic of Korea.
View Book :- https://bp.bookpi.org/index.php/bpi/catalog/book/249
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