NeSSI?%20connectivity:%20progress%20on%20SAM%20and%20Smarts

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NeSSI? connectivity progress on SAM and Smarts
Jeff Gunnell ExxonMobil Chemical Limited
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Domain architecture
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The NeSSI rail concept
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Objectives for CPAC fall 05

• Selection / finalization of the NeSSI-bus or
  buses.
• Articulate the need for both an embedded and a
  standalone SAM.
• Prioritize the SAM applet software needed by end
  users to drive reliability.
• Clearly describe what component makers need to do
  to produce NeSSI products.

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User wants

• NeSSI(TM)-bus that is certified for both IS and
  non-IS.
• Open architecture, non-proprietary NeSSI(TM)-bus
  communication - anyone's component can talk to
  anyone's analyzer.
• Open connectivity to the process control and
  maintenance domains, using OPC.
• Open transferable applets - across all analyser
  manufacturer's platforms for both the embedded
  and stand-alone SAM.
• Plug and play sample systems.

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NeSSI? Bus options
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SAM hardware options

• Explained in the Gen II spec
• updated for clarity in May 05
• see Section 10.3
• see Figure 10

http//www.cpac.washington.edu/NeSSI/NeSSI_Gen_II_
Spec_6_21_04.pdf
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Figure 10
Stand-alone SAM
Embedded SAM
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Stand-alone SAM

• SAM has its own enclosure
• The NeSSI-bus provides intrinsically safe,
  bi-directional communication with sensors and
  actuators
• Heating for the substrate, enclosure or other
  devices is controlled by SAM
• SAM communicates to the DCS and operations and
  maintenance domains via Ethernet.

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Embedded SAM

• The sensor or analyzer has its own controller and
  is directly connected to the controller, eg
• spectrometer with a sample cell on the substrate
  connected by fiber optic cable
• GC with the sample delivered by NeSSI
• pH sensor connected with electrode cable
• SAM is embedded into the analyzer controller
• The NeSSI-bus provides intrinsically safe,
  bi-directional communication with sensors and
  actuators
• Heating for the substrate, enclosure or other
  devices is controlled by SAM
• Analyzer controller communicates to the DCS and
  operations and maintenance domains via Ethernet.

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SAM software applets

• Michelle Kohn (UOP) survey to identify priorities
  for elements in each major class of
  functionality
• Analyser / sample handling system monitoring and
  control
• Validation routines
• Asset management
• Utility management
• System health
• User interface
• Responses according to
• Customer viewpoint importance
• 1 Nice to have 2 Important
  3 Critical
• Supplier viewpoint ease of implementation
• 1 Difficult gt 6 months 2 Easy lt 6 months
  3 Doable now lt 1 month
• Priority Importance x Ease
• Participants
• Customers Dow ExxonMobil UOP/HW
  CPAC
• Suppliers Parker Swagelok
  Circor
• ABB Emerson
  Siemens
• Infometrix

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Analyser / sample handling system monitoring and
control
Requirement Ranking
Stream switching multiple process sample streams 8.6
Temperature monitor/control of sample system (substrate) heater 6.8
Stream switching zero, linearity, span checks 6.4
Data Validity/quality Flag 6.3
Temperature monitor/control of vaporizing regulator 6.1
Barometric pressure sensing for use with compensation algorithm with analytical results 5.9
Pressure control by means of a pressure sensor / modulating valve 5.5
Temperature monitor/control of enclosure heater 5.4
Temperature monitor/control of selected external heating zones (e.g. methanizer) 5.1
Flow control by means of a flow sensor / modulating valve (sample and bypass) 4.7
Heat tracer temperature monitoring and control 4.6
Backpressure monitoring and control 4.5
Control of sampling pumping and aspiration systems ( spent process back to the source) 4.5
Temperature monitor/control of instrument air purifiers, etc. (clean up) 4.1
Pressure control around a fluctuating process control valve - constant flow 4.0
Provides safety trips based on pressure, temperature, flow (leak), etc. 4.0
Using differential pressure sensor to swing sample filters or change / loss of flow 3.8
Leak detection by pressure lock-in/isolation monitoring pressure fixed time 3.8
Deviation alarm between redundant analyzers 3.8
Interaction with process events for startup and shutdown of sampling and analysis 3.5
Cooling of substrate 3.0
Analytical interaction modules - ranges, optical filter selection, path length selection 2.6
Moisture/condensation sensing and remedial action (as part of filter for example) 2.6
Calculates mass flow/density of process (vapour) sample flows and uses with analyzer concentration to give a mass concentration 2.4
Self-purges / cleans a dirty system on an as need or regular basis 1.7
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Validation
Requirement Ranking
Introduction of zero and span fluids (e.g. valve commands) or other checks for benchmarking/calibration 7.3
Alarms on failed validation check 6.1
Validate analytical sensor operation 4.6
Programmable ability to introduce checks at various times and durations (e.g. every day for x minutes) common to all 4.6
Control charts to determine the need for calibration and track performance above and below the control limits 4.5
Validate flow accuracy 4.0
Validate temperature accuracy 3.8
Validate pressure sensor accuracye.g. timing routine from calibration fluids 3.0
Long term storage and history of SQC results on board 3.0
Calculation of deviation from benchmark values common to all routine USD 2.9
Supports the use of permeation devices (flow and temperature control) 2.8
Calculate analyzer system uptime 2.8
Ability to stagger validation routines when redundant devices are used 1.6
Full survey available on CPAC web-site http//www
.cpac.washington.edu/NeSSI/32_NeSSI_CPAC_Fall_2005
/Software_Requirement_11_05.xls
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Legacy connectivity
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A way forward to develop SAM?

• Start off with embedded systems in GCs
• hardware (computing power) already there
• networking to DCS/maint. domains already there
• control of sample systems already part of design
• Opportunity to develop and test functionality in
  fastest time and at lowest cost
• Starts out with a natural deployment mechanism
• Follow on by deploying the software into a
  stand-alone package
• what ready made devices are already available?

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Reminder

• Open discussion session this evening
• As usual should be lots of fun