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Gas-Compressor Solution Reduces the Pains of Proprietary Systems

Open, integrated process control solution helps ease integration, reduce costs and simplify operations

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Challenge

  • Replace multiple proprietary systems used in turbomachinery control with one open, integrated platform

Solutions

  • PlantPAx DCS - Technology based on open-communications standards serves as common automation platform by connecting multiple control systems.
  • Integrated HMI gives workers visibility into all systems from one screen
  • AADvance Fault-Tolerant Control System - Provides SIL-3 hardware process control for auxiliary systems; manages overall system trips, interlocks and permissives

Results

  • Reduced Costs - Integrated platform speeds deployment, reduces spare-parts inventory and enables end user to keep maintenance activities in-house
  • Simplified Operations - Workers can initiate operations with two button pushes and view all aspects of operations from single HMI

Shale Gas Growth Fuels a New Kind of Project

The U.S. is already the world’s top shale gas producer, and production is only expected to grow – from 37 billion cubic feet per day (Bcf/d) in 2015 to 79 Bcf/d by 2040.

Energy Control Technologies (ECT), an OEM member in the Rockwell Automation PartnerNetwork™ program, is one of the companies helping drive this relatively recent energy boom. The Iowa-based company designs, builds and supports turbomachinery-plant control systems for oil and gas production. Its anti-surge and performance-control solutions are used in applications ranging from gas production and offshore platforms to refining and pipelines.

One company recently selected ECT to develop the turbomachinery control for gas compressors at a new, U.S.-based LNG pretreatment facility. While ECT has decades of experience developing systems for oil and gas operations, this customer’s project presented a new challenge: deliver the turbomachinery control platform in an open and integrated solution instead of using the traditional proprietary-systems, or “black-box” approach.

High-Availability Turbomachinery

ECT was tasked with developing a turbomachinery control system for two trains, each with three parallel compressors. Because the operations will be expected to run continuously for years at a time, a redundant architecture was essential to ensure a backup system would take over and reduce the likelihood of downtime should a failure occur.

The turbomachinery itself required a SIL 2-rated hardware platform for the compressor controls. The auxiliary systems required a SIL 3-rated hardware platform for the motor cooling, lube oil and seal gas skids, and overall management of all system trips, interlocks and permissives. Finally, the project required condition monitoring of the vibration and bearing temperatures for all the equipment.

This project also needed to integrate the six compressor control systems with a single motor soft start system. To meet this unique requirement, ECT provided an additional redundant PLC to manage the sequencing and interlocks necessary for all six of the compressors’ electric motors to share a single LCI soft starter.

Traditionally, developing a high-availability, turbomachinery control platform of this magnitude required combining multiple proprietary systems from different vendors. But that approach comes with a number of inherent challenges.

“The different systems often don’t natively talk to each other, which makes integration more challenging and time consuming,” said Tom Stoll, senior project engineer for ECT. “Also, piecing together different proprietary systems can make life more difficult for end users in several ways. It requires maintenance technicians to learn and be able to service a wider range of systems, or outsource maintenance to multiple vendors. It requires operators to learn and work with different HMIs. And it requires companies to purchase and manage more spare parts.”

ECT’s customer wanted to avoid these challenges altogether by relying on a single vendor to combine all of these systems into a single integrated solution using open-architecture, industry-standard technology.

Designing an Integrated Alternative

Delivering an easy-to-use system with this breadth of scope meant that ECT needed to use an automation technology that leverages open-architecture standards.

The company found just that in the modern PlantPAx®DCS from Rockwell Automation. The PlantPAx technology is based on open-communications standards and can serve as a common automation platform by connecting process, discrete, power, information and safety control.

For the turbomachinery applications, ECT used the PlantPAx system to provide a SIL 2-rated platform for compressor control. The hardware leverages add-on instruction capabilities and delivers execution speeds that are equal to or better than proprietary systems. ECT also incorporated its patented, state-of-the-art, surge-control software, which uses algorithms to help detect and prevent potentially damaging surges in the compressor.  Integrated HMI software from Rockwell Automation was used for the operator interfaces.

“We also incorporated load-sharing as another critical application in the turbomachinery control system,” Stoll said. “The compressors work together to maintain a constant discharge pressure for the compressor network. Load-sharing also allows the customer to bring individual machines on-line or off-line to accommodate changing demands without disturbing the overall process.”

For the auxiliary systems, ECT used the AADvance® fault-tolerant control system from Rockwell Automation to provide a SIL 3-rated hardware platform for sequencing and process control for the auxiliary skids, and for system trips.

“If the lube-oil system quits or if cooling is lost on the motor, the AADvance platform can trip the system and stop it before damage occurs,” Stoll said.

As part of the integration of the turbomachinery, auxiliary control and condition monitoring systems, the open-platform solution also provides a single connection to the plant distributed control system (DCS) via Modbus/TCP.

A Simpler Solution With Lower Lifecycle Costs

ECT’s open-platform design approach helped save time and reduce complexity in deploying its customer’s compressor solution while meeting or exceeding all specifications.

“The PlantPAx system and Modbus/TCP communications allowed us to integrate everything together into a single platform,” Stoll said. “Had our customer gone with a proprietary solution, this would have required systems from as many as four different vendors. Just trying to get those systems to communicate with each other would have been a major project in itself.”

ECT estimates the Rockwell Automation solution could save its liquefied natural gas customer upward of 50 percent in lifecycle costs. This includes not only reduced integration costs, but also reduced support and operating costs.

“One system instead of four will mean fewer technologies for workers to learn and maintain,” Stoll said. “It also reduces the number of spare parts that need to be stocked and managed to support the system. And it allows our customer to potentially bring maintenance activities in-house that they otherwise would need to outsource to several vendors in a proprietary-systems approach.”

The open and integrated design approach also will offer greater efficiencies over a proprietary approach. For example, a proprietary approach would have required that operators work from as many as a dozen different panels and stations to initiate operations. The integrated platform will greatly simplify that process.

“It turned this very complicated sequence of getting the motor started into literally two button pushes for an operator,” Stoll said.

Also, because all of the platform’s control elements are integrated, operators and technicians will be able to access any of them from a single HMI, rather using a different HMI for each different system.

“With the PlantPAx solution, workers will be able to monitor overall production status, review a system’s performance, or look at trips and diagnostics – all from one screen,” Stoll said.

The results mentioned above are specific to Energy Control Technologies’ use of Rockwell Automation products and services in conjunction with other products. Specific results may vary for other customers.

AADvance, PartnerNetwork and PlantPAx are trademarks of Rockwell Automation Inc.

Published 06 March 2017

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