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Case Study
Recent ActivityRecent Activity
8 minute read

Supplier Delivers Multiple Benefits to Leading European Water Company

A recent programme of upgrades and plant expansions has seen a major Spanish water company experience many benefits from its adoption of contemporary technologies and services from Rockwell Automation

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Supplier Delivers Multiple Benefits to Leading European Water Company hero image

Challenge

  • ATLL must provide drinking water regardless of the quality of the local river supply, which changes constantly each day

Solutions

  • FactoryTalk AssetCenter
  • Integrated Architecture

Results

  • With the installation of the latest prediction system for protection and on-line monitoring ATLL has managed to integrate all the information on the condition of the water supply pumps into the plant control system
  • Access control
  • Back-up
  • Security
  • Asset auditing

Background

Certified to ISO9001-2000, EMAS, ISO 14001-2004, UNE 1600:2010 and OHSAS 18001, Aigües Ter Llobregat (ATLL)

is appointed by Generalitat de Catalunya SA to supply drinking water to more than a hundred municipalities in its regional network, from the Ter and Llobregat rivers and from desalinated seawater.

Rockwell Automation's involvement is best visualised when split into three distinctive areas: Asset Management

(of a large and geographically dispersed automation and control infrastructure); an Integrated Architecture
solution (installed to control the world's largest reversible electro-dialysis plant) and an on-line condition monitoring system (to assist in the implementation of a complete predictive maintenance strategy).

FactoryTalk® AssetCentre

ATLL must provide drinking water regardless of the quality of the local river supply, which changes constantly. Every day, during the different shifts, the ATLL control engineers are confronted with multiple changes in the adjustment points of the PACs (Programmable Automation Controllers), in response to the different quality of water in-flow.

ATLL employs some 230 PACs – comprising PLC5, SLC500 and Allen‑Bradley ControlLogix

– in conjunction with 210 Allen‑Bradley PanelView operator panels
. Engineering and maintenance of the PACs is undertaken by four employees, including a Systems Integrator. Even though the PACs are distributed over more than 2,000km2, that can all be monitored from a central position thanks to satellite communication.

ATLL has invested time, money and effort to obtain the IS09001-2000, ISO14001-2004 and EMAS certifications in order to prove to its clients that it can provide water continuously, at a consistent level of quality while respecting environmental demands at all times. With these factors in mind, asset monitoring is vital, especially with regards to any changes made in the PACs. Therefore, it is important for ATLL to control access to the control equipment and at the same time manage its maintenance.

ATLL worked in direct collaboration with Rockwell Automation in order to install the management solution of the FactoryTalk AssetCentre

and to change its IT infrastructure. The solution currently administers approximately 100 PACs, along with two desktop PCs used by ATLL staff and the Systems Integrator. Functions implemented include: access control, an auditing system, a backup and disaster-recovery plan and a reports solution. The benefits include the ability to monitor changes to specific parameters, which affect water quality and the accuracy of the flow meters, more efficient exchange of information and knowledge between control engineers working on different shifts, the prevention of PAC problems when several contractors are working simultaneously on the installations and the security with which timely backups are made.

ATLL plans to improve its maintenance operations through the implementation of a complete disaster-recovery plan, so that the PLCs, jointly with the HMI, can continually supply quality water, even in the event of an emergency. ATLL will use the FactoryTalk AssetCentre solution as part of the requirements of ISO9001-2000, as it will be able to prove that it complies specifically with the regulations pertaining to control of industrial assets.

Rockwell Automation Integrated Architecture™

Through expansion of the installation, the drinking water treatment station (ETAP) at LLobregat has increased its production from 200,000 to 345,000m3/day.

The project, co-financed by the cohesion fund of the European Union, is designed to improve the treatment line, as water from the lower branch of the River Llobregat presents salinity and contamination (Trihalomethanes) problems, which make the purification process difficult. For this reason, ATLL needed to put a desalination plant into operation, based on a reversible electrodialysis system (EDR), which allow improvements to be made to the chemical and organoleptic properties (taste and smell) of the water.

Another challenge was reaching a greater level of plant automation. All the control and site components must be monitored from a central position. The purpose of this is to increase the 100,000 existing signals with 30,000 new signals (distributed over an area of 2,000km2), monitored in real time from the control room which regulates the operation of the regional distribution network. Finally, the high availability of the installation is also a legal issue – it is unacceptable to stop production of drinking water, even for a few hours. This factor implies that the plant process is structured in parallel and that a reliable, flexible, and scalable control solution is found.

Working jointly with ATLL, Rockwell Automation and EBE Associates developed an advanced automation solution for the new plant based on the Rockwell Automation Integrated Architecture solution. The control solution integrates 11 Allen‑Bradley ControlLogix® PACs; nine of which are located in the EDR, subdivided into nine totally independent production lines. This allows engineers to only need to stop one-ninth of the plant for any reason. Each of these PACs is connected to an Allen‑Bradley PanelView™ Plus 1250 operator panel, allowing the local monitoring and manipulation of each of the nine lines. The I/O is divided into four remote Allen‑Bradley ControlLogix frames and the decentralised I/O on site is configured using three frames of FLEX™ I/O

cards.

All the controllers, operator panels and decentralised inputs and outputs are connected using a redundant Allen‑Bradley ControlNet network, which helps make sure high availability of data in provided in any situation. In order to act on the site valves, there are DeviceNet networks for each of the nine production lines. In summary, the desalination plant includes a total of nine redundant Allen‑Bradley ControlNet networks, 18 DeviceNet networks and a total of 10,200 signals, 1,000 of which are analogue for processing.

The other two redundant Allen‑Bradley ControlLogix PACs are responsible for managing the pump station, the lime beds, the control of the addition of chemicals and auxiliary components of the installation. The inputs and outputs are distributed on site using Flex I/O cards and joined through a redundant Allen‑Bradley ControlNet network. All the controllers are joined together at the central control room using an EtherNet/IP network on fibre optic ring topology, which configures the ideal means for displaying any parameter from any device in real time.

The great versatility of the Integrated Architecture solution combines Logix multidiscipline controllers platform, NetLinx open networks architecture, View display platform and FactoryTalk data and information services. This provides the highest level of reliability, flexibility and scalability necessary for meeting the objectives stated from the start of the project.

On-Line Condition Monitoring

ATLL has experience in the use of predictive maintenance systems based on vibration readings in its machines, through the use of portable data collectors. The advantage in this case, is that with a reduced investment in the acquisition of instrumentation and software, a large number of machines in one plant can be measured. The problem, on the other hand, is the assumed cost of a full team trained in these techniques, and the lack of information in real time of the mechanical condition of equipment considered critical for the process.

One of the most critical installations in the plant is the water intake. This intake, initially made up of four vertical pumps, has now been increased to eight. After an extensive analysis of the different alternatives on the market relating to online monitoring of vibration, temperature and critical parameters, ATLL opted for a solution from Rockwell Automation based on the XM family. The reasons which brought them to this decision are listed below.

Variable-Speed Machines

In installations where drives are used to regulate motor speed, savings in energy consumption have been achieved of up to 50% when centrifugal loads, such as water, are regulated with pumps working between 100 and 80% of their capacity. This means that the machines used must have a very accurate speed control for regulating the flow, and from a mechanical point of view, certain precautions when operating and maintaining them. Thanks to the tachometer input, which the series Allen‑Bradley XM120 vibration control devices have, it is possible to correlate the vibration level and operating speed directly. This allows the vibration value to be controlled permanently as a multiple of the speed of rotation (1x, 2x, 3x, etc.). This data, as well as the phase reading, is key when starting and stopping the pumps, and under normal operating conditions, as they allow the critical and resonance frequencies of the system assembly to be ascertained.

Distributed System

The price of copper, the cost of maintaining the cabling and developments in communications have favoured the use of fieldbuses, resulting in a new concept of distributed architecture. At ATLL, four vibration channels, one tachometer and six temperature-reading channels have been connected to the corresponding XM units installed in a small cabinet at the foot of each of the pumps. Each of these cabinets communicates using DeviceNet real time. In turn, these are connected to other distributed devices such as an Allen‑Bradley ControlLogix PACs, a converter unit XM500, and a pair of Allen‑Bradley PanelView 1250 operator panels which carry out monitoring and control. The controller also creates a bridge between the field DeviceNet and the plant's Ethernet.

Restrictions of 4-20mA Transmitters

The first restriction found was that these transmitters are designed to work at predetermined amplitude and frequency ranges. This restricts the use of a specific transmitter unit with regard to an approximate amplitude for each type of machine. Also, the mid-frequency ranges, (always fixed) may not filter vibration levels from other machines, and are not even capable of detecting mechanical problems, such as bearing failures, due to the incompatibility of ranges or measurement units. The use of these probes made it necessary to wire up each channel point to point, and to have cards available at the reception (controller), which were compatible with analogue signals, with the resulting additional cost.

ATLL chose the XM solution from Rockwell Automation, which allows the installation of standard vibration probes (accelerometers) with no restrictions regarding frequency or amplitude ranges, and without any kind of distinction between them.

Capacity for Analysis

ATLL appreciates that the devices have sufficient information necessary for making an advanced diagnosis. Each XM 120 vibration unit is capable of measuring, in real time, more than 30 vibration parameters: spectrum FFT, waveform, four configurable bands regarding frequency and speed of rotation, independent amplitude levels with regard to the type of failure (imbalances, misalignments, bearings, etc.), sensor states, record of files and inhibition of alarms with respect to the speed of the machine. This information is processed locally for each unit and sent to the Allen‑Bradley PAC and to the different systems and departments of the plant, so that the general states and parameters of the pumps can be available in real time. The maintenance staff will have more complete information to hand, such as the wave analysis of spectra, which is then recorded in the database of the Emonitor program.

Conclusion

ATLL, with the installation of the latest prediction system for protection and on-line monitoring from Rockwell Automation, has managed to integrate all the information on the condition of the water supply pumps into the plant’s control system. This information will be extremely useful for general operations, in order to efficiently adapt the maintenance plans to the real conditions of the machines, and easily expanded into the remaining critical equipment of the plant.

The results mentioned above are specific to this customer's use of Rockwell Automation products and services in conjunction with other products. Specific results may vary for other customers.

Published March 2, 2015

Topics: Food & Beverage
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