Liquids Custody Transfer

Willowglen can meet your industrial automation needs by providing:

  • Redundant Remote and Master Stations
  • Comprehensive System Security
  • Communication Statistics
  • Operational and Historical Archiving
  • Compressor Station Control
  • Sampling
  • Automatic Pump-off Control
  • PID Closed Loop Control
  • Optional Integrated Pipeline Simulator
  • and more

For liquids pipelines, Willowglen can provide the following:

  • Injection of Drag Reducing Agents
  • Remote Meter Proving
  • Ultrasonic Proving
  • Historical Meter Prover Values
  • Similar-Day Load Forecasting
  • Linear Optimization of Regulator Set points
  • Corrected API Liquid Flow Rate and Accumulation Calculations
  • Net Oil Computation-Capacitance Probe
  • Optional Integrated Batch Tracking and/or Leak Detection
  • Optional Integrated Pipeline Simulator
  • and more

Unisen 9100 Series Flow Computer

New All-in-one Flow Computer and HMI (and optional PLC), providing standardized configuration of 2-6 meter applications

The new Unisen 9100 Series Flow Computer (suitable for 2-6 meters) delivers complete flow computer, HMI, and optional PLC functionality – in a manner which allows for standardized deployment across your operations.

Find out more

Key Features

Large Scale Metering

The Unisen Flow Computer interfaces to standard liquids or gas flow meters, and functions in a variety of configurations – from a single flow meter up to 25 meters, even if distributed across multiple headers.

Metering Proving

The Unisen Flow Computer is able to calculate corrective meter factors through volumetric proving.

Electronic Ticketing

Through our 40 years of experience, Willowglen knows that each customer operates differently and as such can have different expectations – especially when it comes to Electronic Ticketing for accounting and auditing. For that reason the Unisen’s electronic ticketing can be easily adapted to the needs of your business.

QA Sampling

The Unisen flow computer has sophisticated user customizable algorithms to control the sampling apparatus, as well as logic to determine when to take samples (according to the batch size, current flow rate and current sample volumes.)

Audit Logs

Every maintenance, configuration, or operator action performed on a Willowglen Unisen flow computer is recorded in an audit log. Each entry contains a time stamp, the change issuer, along with the old and new value.

Intuitive User Interface

Standard web browser can be connected to the Ethernet port on the Unisen Flow Computer to configure or view its database. No special software, hardware, or licenses needed.

Configurable Reports

By using one of the four Ethernet ports on the Unisen, reports can be set to automatically print directly from the flow computer itself (no need for an intermediate PC to do the printing). Alternatively, reports can be saved as
files in PostScript or CSV file format.

Flexible I/O Card Arrangement

Unisen allows I/O cards to populate any chassis slot with no pre-defined limiting arrangement.

IEC Programming Environment

The Unisen Flow Computer allows customers to create their own programs. These programs can be written in any of the five IEC 61131-3 languages. The Unisen’s high performance CPU and large memory capacity allows these programs to be large and complex.

Dual Redundant

When system reliability is paramount, two Unisen flow computers can be connected to the same field I/O and operate together. Both units operate simultaneously yet record I/O and do calculations independently. They share relevant data through our dual sync software. This ensures a smooth transition when control switches between the main and backup units. The Willowglen Changeover Switch mediates which flow computer controls analog outputs. The dual sync software ensures both units have the same analog output set points in the event that control switches from one unit to the other.

Specifications

Technical Specifications

Double precision floating point math; 400 MHz 32-bit processor; Linux operating system; power saving modes; 256 MB memory.

Standards

The Unisen Series 5 Flow Computer is compliant with API chapter 11 measurement standards, as well as AGA 3, AGA 7, and AGA 8.

HMI

The small HMI features full graphic displays and keyboard for data entry, viewing reports and tickets, and can be easily upgraded with a pre-installed Omni Software Modbus Map.

Some 10+ year flow computer installations may need upgrading. To simplify upgrades, Willowglen provides a faceplate to directly fit older flow computer panel cut-outs that fits the following cut out: 121mm width x 210mm height (4.75in width x 8.25in height)

Value-Added Services

  • Software Configuration
  • Panel Wiring
  • Factory Acceptance Testing
  • Supervise On-site Installation
  • On-site Configuration
  • Assist with On-site Commissioning
  • Ongoing Servicing and Support

Case Studies

The World’s Largest Liquids Pipeline System

Enbridge Inc. operates one of the world’s longest and most sophisticated crude oil and petroleum products pipeline system. The system is approximately 25,420 kilometres (15,795 miles) long and delivers an average of 2.2 million barrels of crude oil and liquids every day.

Willowglen has been working with Enbridge since 1981, providing the custody transfer metering systems at key injection and delivery sites. The systems have the following features:

  • Redundant flow calculation processors at key sites with time synchronization to 1 millisecond
  • Each processor pair is designed to handle up to 100 meters and 50 meter provers
  • Temperature, pressure, and meter factor corrections applied for each product type according to American Petroleum Institute (API) Standard 2540
  • Automated Meter Proving
  • Data Trending
  • Flow Splitting/Balancing
  • Batch Detection and Processing
  • Volume/Batch Comparison and Verification
  • Meter Factor Management
  • High Speed Pulse Accumulators
  • Online Configuration
  • Level “B” Security

Custody Transfer

Challenge

Enbridge Inc. required a number of systems which were capable of accurately metering various crude and product transmissions. These systems were to be located at various points along the pipeline. The metering of petroleum was done on a batch basis. The systems needed to be able to queue up several batches for transmission along the pipeline. Volume corrections needed to be performed based on batch composition, temperature, pressure, density and meter factor. Meter factors were to be dynamic, based on online meter proving which the systems monitored. Each system was required to be dual redundant, with the redundant computers synchronized to the millisecond.

Solution

Willowglen’s dual redundant VISTA™ Supervisory Control and Data Acquisition (SCADA) system was selected by Enbridge as being the best choice available in the industry. The VISTA™ system was based on Willowglen’s Rack Mount Industrial Computer (RMIC) hardware which utilizes an industrial platform and can provide direct communication with Willowglen’s Remote Terminal Units (RTU). The RTUs are responsible for monitoring the transducers on the pipeline.

The VISTA™ system features include:

  • Dual redundant custody transfer system accurate to the millisecond
  • High speed terminal support
  • Modbus Programmable Logic Controller (PLC) Communication Support
  • Multiplexed Fiber-Optic Communication
  • Automated Batch Processing

With the VISTA™ system, Enbridge has an easy to configure system with the following features:

  • Online Configuration
  • High Performance Real-Time Data Acquisition
  • High Precision Batch Control Accurate to the Millisecond
  • Dual Redundant Batch Comparison and Verification
  • Automated Meter Proving
  • Valve Control
  • Sophisticated Volume Corrections Based on Product Type
  • Capable of Monitoring up to 100 Meters
  • Data Trending
  • Programmable Acquisition and Control (PAC™) Programs

The VISTA™ system can communicate with the PLCs for valve control and alarm monitoring. Communication with the Enbridge’s network is also supported so that system data can be transmitted into the corporate databases. At some of the sites, the RTU is over a 1000 feet away from the main systems. In these cases, Willowglen Fiber-Optic Communication Units are used to provide the required high speed and multiplexed communication link.

Measurement Information Data Gathering Interface

Challenge

Enbridge has a measurement system that handles the batch volume metering, meter proving, and volume corrections. The measurement system operates separately from Enbridge’s main SCADA system and must be extremely accurate and reliable.

There was a need to upgrade the old measurement system at some of the terminals and to provide an operator interface for the gauger and operators. Some of the metering information must be sent to Enbridge’s Supervisory Control and Data Acquisition (SCADA) system and Management Information System (MIS). Manual transfer methods have been used in the past and automatic transfer mechanisms are now required.

Solution

Willowglen was selected to provide a Measurement Information Data Gathering Interface (MIDGI) and updated Custody Transfer System (CTS). This system replaced the previous measurement hardware, provided a new, highly advanced user interface for the operators and automatically transfers measurement data to Enbridge’s corporate Oracle® database.

Willowglen’s SCADACOM® 3.0 software was selected for the Measurement Information Data Gathering Interface. Digi International Inc. PortServers® have been added so that the UNIX based host system can be used to acquire data from these RTUs over fibre optic and other customer supplied Local Area Network (LAN) extensions. With concise, well organized, real-time data, the operators are able to quickly respond to system events, analyze the current state of the system and execute control actions. Data in the MIDGI system’s integrated Oracle® relational database is automatically transferred to Enbridge’s corporate Oracle® database using the Enbridge corporate LAN.

The existing Custody Transfer Systems have been upgraded to Willowglen’s Model 8016 Remote Terminal Units (RTU). The same high standards of redundancy, high precision batch control with millisecond accuracy, automated meter proving, valve control and volume corrections are provided with these high-powered RTUs. Several batches can be queued up for transmission along the pipeline. Volume corrections are performed on batch composition, temperature, pressure, density and meter factor. Meter factors are dynamic, based on the online meter proving which the system monitors.

Multi-Tiered Measurement and Electronic Ticketing System

Challenge

Enbridge has a measurement system that handles the batch volume metering, meter proving, and volume corrections. The measurement system operates separately from Enbridge’s main SCADA system and is required to be extremely accurate and reliable.

Local and remote operator interfaces for the gauger and operators are required for each of the numerous metering sites. Electronic ticketing must be automatically performed at each metering site and this information must be transferred to Enbridge’s Management Information System (MIS). Manual transfer methods have been used in the past and automatic transfer mechanisms are now required.

Solution

Willowglen was selected to provide a Measurement Information Data Gathering Interface (MIDGI) and to update the Custody Transfer System (CTS). The new system replaces previous measurement hardware and it automatically transfers measurement data to Enbridge’s corporate Oracle® database. This is accomplished using a multi-tier approach that makes use of Enbridge’s corporate Wide Area Network (WAN). Some of the metering sites are very remote and satellite links are required to connect the measurement equipment to Enbridge’s corporate WAN.

Willowglen’s SCADACOM® 3.0 software was selected for the Measurement Information Data Gathering Interface. Digi International Inc. PortServers® have been added so that the SCADACOM® Tier 2 system can be used to acquire data from the SCANFLOW™ systems over Enbridge’s corporate WAN. The data is available to Enbridge’s Measurement Group administrators using the SCADACOM® operator interface. With concise, well organized, real-time data, they can quickly analyze the current state of the system and execute control actions.

The existing Custody Transfer Systems have been upgraded with Willowglen’s dual redundant Model 8016 Remote Terminal Units (RTU) and Model 1208 Remote Terminal Units (RTU) and VISTA™ host computers in a hot standby mode using Willowglen’s SCANFLOW™ solution. Very high standards of redundancy, high precision batch control with millisecond accuracy, automated meter proving, valve control and volume corrections are provided. Several batches can be queued up for transmission along the pipeline. Volume corrections are performed based on batch composition, temperature, pressure, density and meter factor. Meter factors are dynamic and are based on the online meter proving that the SCANFLOW™ system also monitors and controls.

Relevant data in the SCADACOM® database is automatically transferred to Enbridge’s Tier 1 corporate Oracle® database, again using Enbridge’s corporate WAN.