The Rosemount Model 8800 Handles
Vibration and Clogging Problems in Polyester Fiber Production
PTA and Mother Liquor Flow
Measurement
Purified terephthalic acid (PTA) is used to produce
polyester fibers, film, and polyethylene terephthalate (PET) bottle resins. PTA is
produced by passing slurries of terephthalic acid through a catalyst at elevated
temperatures to remove the undesired impurities. The PTA is then crystallized and filtered
out, resulting in a separate "mother liquor" flow.
The mother liquor is a low-viscosity fluid with
light solids. The production of PTA requires precise measurement of mother liquor flows at
wide-ranging flowrates.
The Vortex Flowmeter Solution
The process to measure mother liquor in polyester
fiber and PET production requires precise flow measurement and wide rangeability. The
vortex flowmeter has the necessary precision. However, customer experience has
demonstrated that not all vortex flowmeters are created equal.
The Rosemount Model 8800 Solution
A customer initially installed a competitor's vortex
flowmeters to measure mother liquor flow and encountered two problems. The main problem
was an unstable output signal due to the effects of vibration. The flowmeters also had
clogging around the sensing mechanism, impairing the meters. The customer had to remove
and clean them every week.
The customer switched to another competitor's
vortex flowmeters to address the problems caused by vibration. On these flowmeters
however, the ports on the shedder bar clogged and had to be removed and cleaned every two
weeks. Each of the 21 flowmeters took an hour and a half to clean, which meant that more
than a full day of production time was lost.
The customer then turned to Rosemount to address
the vibration and clogging problems. The Rosemount Model 8800 Vortex flowmeters were
installed. The Model 8800’s all-welded, nonclogging design and its superior immunity
to vibration solved the customer’s problems. Since installation nearly three years
ago, all 21 Model 8800 Vortex flowmeters have performed flawlessly. No maintenance or
cleaning has been required. There are no more daylong downtimes in the process. Profits
increased and the headaches of constant maintenance disappeared.
Rosemount’s innovative design—which
eliminates ports and crevices—combined with mass balancing and adaptive digital
signal processing, makes the Model 8800 Vortex flowmeter the clear choice for continued
value.
For more information, link to the 8800C product
page or call Customer Central at 1-800-999-9307 or 612-906-8888 to discuss how the
Rosemount Model 8800C can be used in your applications.
|
|
|
|
|
Emerson Process Management,
Rosemount Division, 8200 Market Blvd.
Chanhassen, MN USA 55317
North America: 1-800-999-9307 International:
952-906-8888 Fax: 952-949-7001
|
|
