Flow Measurement and Safety Instrumented System (SIS) in Crude Charge Heater Pass
Measurement redundancy and reliability for critical safety application
Reliable Flow Masurement to Avoid False Heater Trips
Accurate and reliable flow measurement is important in multi-pass fired heaters to guard against heater damage and to avoid false heater trips. It is important to know that the heater pass flow measurement is reliable. These measurements are typically part of a Safety Instrumented System (SIS) loop due to the implications of mismeasurement. Typically, challenges associated with steam tracing are plugged and frozen impulse lines causing significant maintenance issues. The Rosemount™ 8800 Quad Vortex Flow Meters can be installed in hard-to-reach locations with remote electronics allowing for easier access and process control. With the extremely reliable gasket-free, non-clog meter body and no impulse lines, maintenance is greatly reduced. In the rare case of sensor replacement, the Rosemount™ 8800 Quad Vortex Flow Meter has a unique sensor design that is isolated from the process and enables replacement without disrupting operating conditions.
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Product Solutions
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
