Transcript application of smart modular sample systems at an olefins plant

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
•
•
•
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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
NC
Analyzer
Return
NO
Atmos.
Vent
FE
Analyzer Flow
Controller
From
Analyzer
To
Analyzer
NC
NC
Calibration
Supply
Calib.
Shut-Off
PI
Sample
Supply
F
Guard
Filter
PE
NC
F
Supply
Shut-Off
Supply
Pressure
Stream
Valve
(config-1)
Supply
Filter
Pressure
Transmitter
Stream
Valve
(config-2)
FE
Bypass Flow
Controller
Sample
Bypass
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 1981Present
• 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)