Date post: | 20-Dec-2015 |
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APPLICATION OF SMART MODULAR SAMPLE SYSTEMS AT
AN OLEFINS PLANT
John B. Cumbus
ExxonMobil Chemicals
Baytown Olefins Plant
History
• Concept first described at 1998 WAN Meeting
• Dan Podkulski active on IP 76 “footprint” Committee
• Industrial Experience has shown benefit of monitoring
• Semi-conductor industry experience • CPAC NeSSI effort
Expected Advantages
• Minimum Engineering /Drafting Effort
• Simplicity of Construction
• Ease of Maintenance
• Leverage Technicians for Higher Priority Activity
• Higher Service Factors
Installation Considerations
• Designed for relatively clean, dry process streams (light hydrocarbons)
• Sensors connected to gas chromatograph (analog inputs and analog outputs)
• Power for sensors originates in the analyzer
SupplyFilter
Bypass FlowController
SampleSupply
SampleBypass
SupplyPressure
ToAnalyzer
CalibrationSupply Stream
Valve(config-1)
GuardFilter
StreamValve
(config-2)
FromAnalyzerAnalyzer
Return
F
SupplyShut-Off
NC
NO
NC
NC
NC
Atmos.Vent
Calib.Shut-Off
FE
PI
F
Analyzer FlowController
FE
PE
PressureTransmitter
Engineering Package
• Provided by Configurator
• Pressure Indicator left for Technicians
• Eight Single Stream and One Dual Stream
• Three Analog Outputs, Two Inputs
Modular Sample System (minus MFMs)
Modular System Connections Inside Enclosure
New System in an Old Box
Assembly Test of Smaller System (76 Pieces)
Assembly Test Configuration
Assembly Drawings Provided
Completed Assembly
Example of Mechanic’s Previous Work
The “Mechanic”, Age 9
Comparison of “Old” and “New” Sample Systems
Sample System (Exterior) and Gas Chromatograph (Interior)
Gas Chromatograph Display Panel
Experience So Far
• Six of Nine Systems have been in Service since early to mid December
• Minor Start -Up Problems Encountered with Wiring Inside Sample System
• One MFM Operated Briefly, then Ceased to Control Flow
• No other Problems Encountered
Conclusions
• Smart Modular System has performed as expected in limited evaluation time
• Expected benefits appear to be realistic• Thought should be given to GC/Controller
programming and what to do with system data
• Need to expand parts availability,meet electrical classification of at least Div 2
John B. Cumbus
• Master’s in Analytical Chemistry from Auburn University in 1979 (After Pat Sullivan, but before Bo Jackson)
• Analyzer Engineer at Celanese in Bishop, Texas 1979-1981
• Analyzer Engineer at Exxon Baytown Olefins Plant 1981-Present
• Chairman Exxon Chemicals NA Analyzer Network 1987-1990
• Chairman ExxonMobil Worldwide Analyzer Network 1998 to Present
• Proudest of: Two Daughters and One Son
• Favorite Activities: Traveling to Florida’s Beaches, Enjoying Fine Rum, and Shooting Handguns (Not at the Same Time)