10 steps to a smoother automation system upgrade

08/27/2013


Critical documentation

The new automation installation with all its interfaces and connections to field equipment and wiring, network infrastructure, and ancillary systems, will require many changes to documents and drawings.

Certain critical documentation must be reviewed and often updated in order to operate and maintain the new automation system successfully. Some of the most important documents that must be examined include P&IDs, loop sheets, I/O databases, system configuration, software programs, software documentation, batch requirements, functional specifications, control system narratives, and programming and design standards. 

Demolition, installation, and commissioning

A thorough FEL evaluation will examine the required demolition, installation, and commissioning services to make sure these activities are properly accounted for in terms of budget, schedule, and available manpower. Manufacturing facilities are typically staffed to handle day-to-day operations, and don’t have personnel available to execute major projects. Therefore, the FEL evaluation should identify the required personnel, and make provisions for contracting for additional forces. 

The commissioning plan is a critical component of any automation system upgrade. Major items that must be taken into account typically include shutdown schedules, plans to minimize downtime, and use of hot cutovers. As with other activities related to installation and commissioning, supplemental manpower will probably be required. Provision must also be made to account for plant output typically lost during installation and commissioning.

Construction design activities associated with installation and commissioning should also be estimated and planned in the FEL evaluation so that they can be properly executed. Some of the key activities that may need to be performed included the development of new cable and conduit schedules, instrumentation and field devices drawings and diagrams, panel and enclosure designs, loop sheets, motor elementary diagrams, point-to-point diagrams, and installation details drawings. 

Compliance and abnormal situation management

The changes made to accommodate the automation system upgrade will require examination to ensure compliance with all standards, codes, and operating procedures.

Safety instrumented systems (SIS) must be checked to ensure that all required SIL levels are maintained. A layer of protection analysis (LOPA) may need to be performed, and environmental health and safety procedures must be maintained at acceptable levels.

Compliance with current codes and standards such as NEC, NFPA, and FDA regulations must be maintained, often with permits and inspections in the case of NEC and NFPA regulations. Likewise, FDA regulations for validated systems contain a very strict protocol that must be followed for all changes at facilities that manufacture pharmaceutical products. Many food and beverage plants must also comply with FDA regulations when performing changes and upgrades, albeit at a less stringent level.

Your older automation system will have had some informal or formal methods for dealing with abnormal situations. Similarly, the new automation system must also have a method to handle abnormal situations. This is an area that can often be improved upon by simply taking advantage of features built into the automation system, as well by implementing current abnormal situation management (ASM) graphics and alarm management standards and best practices.

In fact, the FEL evaluation should examine all possible areas of improvement, including ASM, as this will ensure the maximum return on investment for the new automation system. 

Areas for improvement

The new automation system will typically have features and functions not available with the older DCS or PLC-based system, allowing for improvements to existing operations. Further improvements can result from modifying existing operations and practices, with the automation system upgrade providing an ideal time to perform these activities.

A leading area for improvement is automating processes and systems that were run in manual mode with the old automation system. If manual operation was required because the plant had insufficient components and equipment, then these items will require upgrades or replacements. For example, an on-off valve may need to be modified or replaced so that it can operate as a control valve to automate a particular control loop.

In other cases, the new automation system may allow automation of areas that simply couldn’t be automatically controlled by the older system. Newer automation systems often have advanced process control features built-in, allowing difficult loops to be controlled automatically. Automating manual processes will produce an immediate and substantial return on investment by reducing required operator involvement and consequent human error, by avoiding shutdowns, by improving yields, and by increasing throughput.

Many older automation systems present data and diagrams to plant operators through antiquated graphics displays with low resolution, poor screen quality, and insufficient screen size. By contrast, newer automation systems can take advantage of the tremendous increases made over the past few decades in terms of improved operator interface hardware and software to reduce operator fatigue, facilitate training of new operators, and improve abnormal situation management.

An automation system upgrade can replace an obsolete system with one that can be supported and maintained more easily, but it is also an ideal time to make major advances in operations. Simply replacing like-for-like is a huge lost opportunity. In order to take full advantage of an upgrade and minimize risk, a thorough FEL evaluation must be performed to examine all areas that will be affected by the upgrade, including those outside of the HMI, controller, and I/O.

Matt Sigmon is director of DCS Next at MAVERICK Technologies. 

Key concepts:

  • Process control system migration and upgrade projects often require more analysis than most companies realize.
  • A systematic approach to analyzing the project early can help avoid problems and identify opportunities for improving performance.

 

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Allen , TX, United States, 09/06/13 02:03 PM:

Matt,
Thanks for the great article. I'm also a big fan of FEL activities. Do you have any metrics relating to the cost of FEL as a percentage of the TIC? I suspect that it's in the 3%-5% range (meaning that it's definitely worth the money), but I don't have data to back that up.
Jonas , , 11/10/13 09:55 AM:

You can modernize any plant with new wireless measurements on any system, regardless of how old, because the wireless gateway supports multiple protocols such as Modbus/RTU, Modbus/TCP, EtherNet/IP, and OPC for process variables as well as HART-IP for intelligent device management (IDM) software past of the asset management system such as for calibration trim, configuration/setup, device diagnostics, and internal variables etc.
http://www.eddl.org/DeviceManagement/

Very often the asset health information, the energy consumption readings, and HS&E status etc. do not even go into the basic control system (DCS) or the safety system (SIS), this new data from wireless sensors often go into the asset management system (AMS). This is tons of new data received by deploying sensors everywhere; “pervasive sensing”. These new sensors can easily be added to an existing plant to modernize that plant because not only do you eliminate power wiring and signal wiring for these sensors, many of them have non-intrusive mechanical installation. For example, to monitor the position of the bypass valves or any other control valve, on/off valve, or hand valve, a wireless transmitter simply screws onto the outside. It is non-intrusive. No process penetration. Similarly, there are clamp-on temperature sensors that measure the surface temperature of the pipe. This is good enough in most asset and energy monitoring applications, and is totally non-intrusive. Clamp-on temperature sensors can be used when thermowells are not available. Acoustic transmitters to monitor if a steam trap is passing steam wasting energy, or blocking condensate which could damage equipment or cause insufficient heating, simply straps onto the outside of the pipe, again non-intrusive. It can also strap onto a relief valve to detect release, or another valve to detect leaks. Vibration sensors for wireless vibration transmitters can either be screwed on, stuck on with epoxy, or even a magnet without any process penetration. Pressure transmitters often take the place of mechanical dial gages so again no new process openings required. This makes installation of these additional sensors low cost and low risk.

Most kinds of wireless transmitters are already available: pressure, flow, DP level, valve position, pH, conductivity, on/off contact, radar level, vibration, temperature, multi-temperature, and acoustic as well as level switch and even on/off valve actuation

Plant modernization is a new business opportunity for EPCs. EPCs can go back to all the plants they have built over the past 20-30 years and offer plant-wide modernization by deploying a second layer of automation based on Wireless transmitters for asset monitoring, energy conservation, and improved HS&E beyond the P&ID. A formal process starting from audit, through FEED, detail design, installation, commissioning, and handover is available.

Having said that, if you get a new control system, you can get one with native integration of wireless transmitters, enabling you to access the PV directly from a wireless transmitter without going through Modbus register, EtherNet/IP instance & member, or OPC item data mapping. Getting a system with native support for wireless could be one more reason for migrating.
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