Flow Measurement in Ethylene Plants
Reduce Maintenance Costs and Increase Plant Availability in Ethylene Production
Improve Efficiency and Reduce Costs with Reliable Flow Measurement
In the Ethylene production, carbon and coke deposits are created and re-circulated with process water and steam causing clogging in flow meters. A monthly cleaning schedule was established to overcome this issue. As a result, the plant experienced high maintenance cost, and was unable to optimize their production performance. The 8800 Rosemount Dual Vortex Flow Meter has an all-welded body design with no crevices, process seals, or pockets where particles might collect and cause measurement error. In addition, the 8800 dual sensor unit provides two separate flow measurements, allowing one sensor to provide the process control signal, and the other to be used in the SIS loop. Eight years after replacing the existing meters with Rosemount vortex flow meters, none of the units required cleaning. The improved measurement and ability to better control the process resulted in a 2% improvement in plant efficiency and reduced installation cost by eliminating the need for two separate meters.
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Product Solutions
The Rosemount 8800 Dual Vortex provides a redundant flow measurement solution. The 8800 Dual Vortex Flow Meter protects against false trips using one out of two, or two out of two voting. The 8800 Dual Vortex Flow Meter offers world-class reliability with a gasket-free, non-clog meter body that eliminates potential leak points, resulting in maximum process availability and fewer unscheduled shutdowns.
- Dual sensors, sensing elements, and transmitter configuration provide a compact solution for redundant flow measurement
- IEC 61508 certified for use in safety instrumented systems up to SIL 3 with 1oo2 voting
- An isolated sensor allows for online replacement without breaking the process seal
Flow Meter Accuracy
± 0.70% of mass flow rate in water using 8800 MultiVariable (MTA/MCA option)
± 2% of mass flow in steam using 8800 MultiVariable (MTA/MCA option)
± 1.3% of rate at 30 psia through 2,000 psia in steam using 8800 MultiVariable (MPA option)
± 1.2% of rate at 150 psia in steam using 8800 MultiVariable (MCA option)
± 1.3% of rate at 300 psia in steam using 8800 MultiVariable (MCA option)
± 1.6% of rate at 800 psia in steam using 8800 MultiVariable (MCA option)
± 2.5% of rate at 2,000 psia in steam using 8800 MultiVariable (MCA option)
± 0.65% of volumetric rate for liquids (uncompensated)
± 1% of volumetric rate for gas and steam (uncompensated)
± 2% of mass flow in steam using 8800 MultiVariable (MTA/MCA option)
± 1.3% of rate at 30 psia through 2,000 psia in steam using 8800 MultiVariable (MPA option)
± 1.2% of rate at 150 psia in steam using 8800 MultiVariable (MCA option)
± 1.3% of rate at 300 psia in steam using 8800 MultiVariable (MCA option)
± 1.6% of rate at 800 psia in steam using 8800 MultiVariable (MCA option)
± 2.5% of rate at 2,000 psia in steam using 8800 MultiVariable (MCA option)
± 0.65% of volumetric rate for liquids (uncompensated)
± 1% of volumetric rate for gas and steam (uncompensated)
Turndown
38:1 (single bar duals)
15:1 (dual bar duals)
15:1 (dual bar duals)
Output
4-20 mA with HART® 5 or 7
4-20 mA with HART® 5 or 7 and scalable pulse output
FOUNDATION fieldbus ITK6 with 2 Analog Input blocks, 1 Backup Link Active Scheduler function block, 1 Integrator function block, and 1 PID function block
Modbus RS-485 with device status and 4 variables
4-20 mA with HART® 5 or 7 and scalable pulse output
FOUNDATION fieldbus ITK6 with 2 Analog Input blocks, 1 Backup Link Active Scheduler function block, 1 Integrator function block, and 1 PID function block
Modbus RS-485 with device status and 4 variables
The Rosemount 8800 Quad Vortex provides the ultimate redundant flow measurement solution to guard against spurious trips using two out of three voting and includes a fourth integrated transmitter for process control. The 8800 Quad Vortex Flow Meter offers world-class reliability with a gasket-free, non-clog meter body that eliminates potential leak points, resulting in maximum process availability and fewer unscheduled shutdowns.
- Dual shedder bars, quadrupole sensors and sensing elements, and quadrupole transmitter configuration provides the ultimate solution for redundant flow measurement
- IEC 61508 certified for use in safety instrumented systems up to SIL 3 with 2oo3 voting
- An isolated sensor allows for online replacement without breaking the process seal
Flow Meter Accuracy
±0.65% of volumetric rate for liquids
±1% of volumetric rate for gas and steam
±1% of volumetric rate for gas and steam
Turndown
15:1
Output
4-20 mA with HART® 5 or 7
4-20 mA with HART® 5 or 7 and scalable pulse output
FOUNDATION fieldbus ITK6 with 2 Analog Input blocks, 1 Backup Link Active Scheduler function block, 1 Integrator function block, and 1 PID function block
Modbus RS-485 with device status and 4 variables
4-20 mA with HART® 5 or 7 and scalable pulse output
FOUNDATION fieldbus ITK6 with 2 Analog Input blocks, 1 Backup Link Active Scheduler function block, 1 Integrator function block, and 1 PID function block
Modbus RS-485 with device status and 4 variables
