Gas & Liquid Flow Computer for CompactLogix

MVI69-AFC

The MVI Liquid & Gas Flow Computer Module is a CompactLogix backplane compatible module that allows CompactLogix processors to easily support flow applications with 8 meter runs performing measurement of hydrocarbon gases or liquids using AGA 3, 7, 8 and API MPMS Chapters 11 and 12 measurement standards.

Features and Benefits

The MVI69-AFC is an in-rack Liquid & Gas Flow Computer Module for the CompactLogix platform. The MVI69-AFC Flow computer module supports 8 meter channels for the measurement of hydrocarbon gases and liquids using currently accepted industry measurement standards.

The module calculates flow rates, accumulated volumes, accumulated mass and accumulated energy (heating value). The calculation results are transferred back to the Processor memory for use in the application ladder program or for transfer back to a SCADA host.

The MVI69-AFC Flow Computer package contains built-in support for system configuration, monitoring, documenting, and overall management such as:

• System configuration via a user-friendly MS Windows-based AFC Manager
• Ability to manage multiple site installations as separate projects saved on a PC
• Option to access archives online and print/save to a spreadsheet compatible file
• Option to generate, print, and save configuration and on-line management reports
• Ability to monitor the meter runs on-line
• Password protection for preventing unauthorized configuration changes

Applications

The MVI69-AFC module is the ideal solution for the many applications where hydrocarbon flow and SCADA communication must be added to the CompactLogix platform. Applications using the MVI69-AFC module can be found mainly in the oil and gas industrial sectors.

Functional Specifications

The AFC module operates as a powerful flow computer module, augmenting the operation of the CompactLogix processor by providing a dedicated and accurate set of flow calculations; the results of which are easily available to process monitoring and control applications developed in the CompactLogix.

The module is highly-configurable, allowing each of the 8 meter runs to be individually setup to meet the specific requirement of an application. Some of the configurable parameters include:

Configurable options

• Gas analysis concentrations for any or all 21 components
• Physical data for all meter runs including, orifice and pipe diameters, selection of type of taps and tap location etc.
• Reference pressure, temperature and local atmospheric conditions
• Default process and operating parameters like DP threshold for flow cutoff etc.
• Metric or imperial units
• User selectable units for totalizers and flow rates on a per channel basis
• Resettable and/or non-resettable totalizers for every meter channel
• Process I/O: analog inputs (pressure, temperature, diff pressure) from analog modules and pulse inputs from pulse/frequency input modules in CompactLogix I/O rack
• Number of meter channels: 8 differential (AGA3) or linear (AGA7) Gas; API MPMS Chapters 11 and 12 Liquid
  • Calculation methods
  • AGA3-199
  • AGA 7
  • AGA8-1992 (detailed characterization method)
  • API MPMS Chapters 11 and 12
  • Meter scan time under 1 second for all 16 channels
• Product measurement: hydrocarbon gases and liquids
• Data archiving: For each meter run, hourly for two days (48 records) and daily for one month (35 records) under default configuration, with optional extended archives up to 1440 hourly (60 days) and 1440 daily. Archive size and contents are fully configurable. All archived data is available in the onboard Modbus memory.
• Each record consists of nearly 20 process and other variables. All archived data is available in the onboard Modbus memory map (archive size and contents are fully-configurable)

Reports

• Event log report for all security sensitive configuration data (for example, orifice diameter) are date and time stamped and mapped to the local Modbus memory map. This data can be imported into any spreadsheet program and saved to disk or printed as hard copy.
  • Hourly and daily archive reports mapped to local Modbus memory. This data can be imported into any spreadsheet program and saved to disk or printed as hard copy.
• System configuration which can be downloaded or uploaded from the module, can also be printed for hard reference or archiving.

Modbus interface

• The two Modbus slave ports allow the unit to be used as a SCADA interface and to broaden access to the AFC module's data table.
• Either port may be configured for RTU or ASCII Modbus mode.
• Both Modbus slave ports provide access to all configuration and measurement data mapped to the Modbus table.
• Modbus table may be re-mapped for user assigned contiguous register polling from a SCADA master (up to 20,000 registers.)

Hardware Specifications

Ordering Information

Distributors:
Place your order by email to orders@prosoft-technology.com:, fax to +1 661-716-5101.

Sales and Support:

AFC Version 2.05 Update Notice

If your module measures liquids, please read this notice before upgrading from version 2.04 (or earlier) to 2.05 (or later).

For compliance with new measurement standards, the AFC version 2.05 has introduced several new liquid product groups. In particular, the two non-refined liquid product groups of version 2.04, which covered the entire density range of crudes and NGLs, have each been split into two separate product groups, one for the higher density range of crudes and the other for the lower density range of NGLs. If your module has meter channels configured for either "Crude, NGL" or "Oil-water emulsion", you should decide before upgrading the firmware the new product group (light or heavy) to which each such channel should be assigned. This assignment will be performed during the upgrade process and will preserve all other configuration and historical records including accumulator values and archives, in contrast to changing a product group after the upgrade which resets the meter configuration and erases all historical records. Meter channels configured for "Gas" or "Refined products" are not affected.

AFC Manager exhibits the same behavior when converting a project between versions 2.04 (or earlier) and 2.05 (or later).

The criterion for assigning the new product group depends on the density units and the Default Reference Density, as detailed in the following tables:

Density Units = kg/m3

Density Units = Rd/60

Due to roundoff error of numeric conversions, a Relative Density very close to the cutoff value of 0.6100 may cause the module to assign the new product group opposite to the one that was intended. Before upgrading, change the Default Reference Density to a number significantly different from 0.6100, such as 0.6110 (to target Crude) or 0.6090 (to target NGLs). You may change it back to the correct value after the upgrade

Density Units = API Gravity