LACT Library

The LACTl flow computer library provides crude oil flow computer and batching features for Wago PFC200 controllers.

The library performs API 12 crude oil calculations for custody-transfer meters. Events, alarms, and hourly history are maintained in a manner consistent with API 21.1. Data is extracted from the PLC using industry-standard .cfx files.

The library maintains daily, monthly, and host-program startable/stoppable ad hoc batches.

Oil Flow Computer Feature Summary

For oil calculations, the library supports meter input as either a flow rate or an accumulated volume. Input can be related to either mass or indicated volume. This arrangement accommodates Coriolis, Turbine, and Positive Displacement meters. The meter can be configured as either a custody-transfer meter or an allocation meter.

Meter Calculations		per API 12.2 for custody transfer or API 20.1 for allocation
	Meter calculation frequency	Full calc once per second
	Calculated parameters: custody transfer	Indicated Quantity, Indicated Volume, Gross Volume, Gross Standard Volume, Net Standard Volume, S&W Volume, Gross Mass
	Calculated Parameters: allocation	Indicated Quantity, Indicated Volume, Gross Volume, Gross Theoretical Oil Volume, Net Theoretical Oil Volume, Gross Theoretical Water Volume, Theoretical Flash Gas Volume
	Aggregated values available	Flow Rate, Current Hour Total, Last Hour Total, Today Total, Yesterday Total, Current Month Total, Prior Hour Total, Lifetime Total
Oil Property Calculations	Liquid Correction Factors (CRUDE OIL ONLY)	per API 11.1 Table A (2004)
Water Property Calculations	Water Correction Factors	per API 20.1
Supported Meter Configurations		Coriolis, Turbine, Positive Displacement
Contract Hour	Configurable	Per meter
Units of Measure	Customary U.S. units only	psig, degrees F, API gravity, barrels per day, mass in lbs
Diagnostics	Correction Factors	Corrected Density, CTL, CPL, CTPL, CSW, Standard Density

LACT Feature Summary

Batching	Ad hoc batch	Start/Stop from switch or HMI
	Batch Retention	Configurable - 35 days minumum
	Batch transfer	Companion Windows program copies batch files from PLC via Ethernet
Batch Report Printing	Print directly from PLC via Ethernet	Print to Ethernet printer using PCL
		Custom report format templating
		Batch reports can also be printed from files copied to your PC
User/Driver Authentication	user/password/access database/file	file created on Windows/Mac
		database/file installed on PLC in encrypted format
		PLC program/HMI requests authentication from library

Generic Feature Summary

Data Retention	per API 21.1	Periodic (hourly) history, events, alarms
	Periodic history retention	Configurable by meter. Minimum of 35 days – ranging to file system capacity
	Event retention	256 events per meter per “day”
	Alarm retention	64 alarms per meter per “day”
Data Transfer Method (Collection)	Via CFX files	Quorum/FLOWCAL Common File Exchange Format 8.5.0
		Minimum of 1 CFX per day
		CFX file stored on PLC file system (password protected)
	Manual/Local collection	Users with limited permissions and network access can copy CFX files from the PLC to another computer for transfer to hydrocarbon accounting system
	Remote/SCADA collection	Via secure FTP or SSH
SCADA Interface	Implemented in PLC program
Configuration Loading/Transfer	Via text file	Library provides features to save configuration to file
		Library provides features to load all or part of the configuration from file
Power Loss Behavior	Configuration is retained	PLC persistent memory
	Flow History is retained	PLC persistent memory and file system
	Flow that occurs while PLC is not powered	Not measured
	When power is restored	Broken day is saved as CFX file and calculations resume
Licensing	Free for developer	Library file is free and can be added to any Wago e!COCKPIT instance
	Runtime Licensed	Library generates a site code on the PLC
		Beyond HMI, Inc. generates a license file from site code
		License file is installed on the PLC. License is perpetual but only usable on that PLC.
		Library features will execute for about 4 days after restart in trial mode. License must be installed before this period expires or data will be lost (unrecoverable).

Licensing

The BhiLibDualFc library is available at no cost to e!COCKPIT users. The library uses runtime licensing. A license is required for each PLC which executes the library code. The program will run for approximately 4 days in trial mode before a license is required. Licenses must be purchased from Beyond HMI, Inc.