Liquid and Gas Flow Computer for ControlLogix

MVI56-AFC

The Liquid & Gas Flow Computer Module is designed as an integrated component for the ControlLogix® systems to measure hydrocarbon gases or liquids with accuracy and precision.

The module calculates flow rates and accumulated totals of volumes, mass, and energy (heating value) for the specified liquids and gases. Selected calculated results are available in the processor memory for use in the application ladder program or by a SCADA host via the three front panel Modbus serial ports.

The flow computer and the ControlLogix system has been approved by Industry Canada – Measurement for custody transfer measurement of hydrocarbon gases. The module can be configured and monitored for all the functions using the AFC Manager utility.

Features and Benefits

Configuration

The AFC Manager is an easy-to-use Windows 98/NT/2000/XP/Vista/7 based configuration, reporting, and monitoring tool provided with the AFC modules. Project configurations may be uploaded, downloaded and saved to the PC under user selectable file names.

General Specifications

• Single-slot - 1756 backplane compatible
• Local or remote rack
• The module is recognized as an Input/Output module and has access to processor memory for data transfer between processor and module
• Ladder Logic is used for data transfer between module and processor. Sample ladder file included
• Configuration data downloaded over Modbus or delivered by user-defined ladder.

AFC

The AFC module operates as a powerful flow computer module, augmenting the operation of the ControlLogix processor by providing a dedicated and accurate set of flow calculations. The calculated results are available to process monitoring and control applications through the ControlLogix processor memory or directly from the module Modbus port.

The module is configurable (see PSW-AFC), allowing each of the meter runs to be individually set up to meet the specific requirements of an application.

• 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
• Reference pressure, temperature and local atmospheric conditions
• Default process and operating parameters including DP threshold for flow cutoff
• Metric or imperial units
• Number of meter channels: 16 differential (AGA3) or linear (AGA7) Gas; API MPMS Chapters 11 and 12 Liquids
• Number of streams per meter channel: 4 streams
• Product measurement: hydrocarbon gases and liquids

Functional Specifications

Data Exchange

Seamless data exchange between processor and Flow Computer with backplane compatibility

• Supports 16 meter runs with 4 streams per meter run for the measurement of hydrocarbon gases and liquids using currently accepted industry measurement standards
• Calculates flow rates, accumulated volumes, accumulated mass and accumulated energy
• Calculation results are transferred back to the processor memory or to a SCADA host
• User configurable allowing each of the meter runs to be individually set up to meet the specific requirements of an application

Configurable options

• 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 ControlLogix I/O rack
• Calculation methods: AGA3-1992, AGA 7, AGA8-1992 (detail characterization method), API MPMS Chapters 11 and 12
• Meter scan time under 1 second for all 16 channels
• 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.
• 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

Modbus interface

• Three Modbus slave ports allow for SCADA communication and the Modbus client can be configured for RTU or ASCII mode
• Modbus table may be re-mapped for user assigned contiguous register polling from a SCADA master (up to 20,000 registers)
• One of the three ports can be configured as a Modbus Master port to poll data from a remote device

Archiving

• Supports data archiving and event logging
• Data archiving feature provides 35 regular daily, 48 regular hourly archives or a total of 1,440 each daily and hourly extended archives per meter.
• Event logging feature provides storage up to 1999 events station-wide.

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

Measurement Compliance Standards

• API MPMS Chapter 14.3 (AGA Report No. 3), 1992 ed.

• ISO 5167, Part 2, 2003 ed.

• AGA Report No. 7

• API MPMS Chapter 14.2 (AGA Report No, 8), 1992 ed., Detail Characterization Method (for compressibilities and densities) and Appendix C.3 (for energy content)

• API MPMS Chapter 14.9 (AGA Report No. 11) (Coriolis mass meters)

• AGA Report No. 9 (Ultrasonic meters)

• API MPMS Chapter 11.1, 2004 ed. (complete)

• API MPMS Chapter 11.2 (CPL for lower-density liquids)

• GPA Technical Paper 27 (CTL and density correction for lower-density liquids)

• GPA Technical Paper 15 (vapor pressure for lower-density liquids)

• API MPMS Chapter 12.2 Parts 1, 2 and 3

• API MPMS Chapter 20.1 (measurement of liquids with high water content)

• API MPMS Chapter 21.1 (gases)

• API MPMS Chapter 21.2 (liquids)

• GPA 2145-03

• GPSA Engineering Data Book (SI)

• GPSA Engineering Data Book (FPS)