DeltaV System Chosen For Chemical Processing Plant

Emerson Process Management's DeltaV digital automation system has been selected by speciality chemicals group Perstorp for a control system upgrade at its pentaerythritol processing plant in Sweden. The existing distributed control system will be replaced as part of a plant lifecycle management programme to ensure years of continued high product quality and operational efficiency. The Perstorp plant uses a chemical batch process to make pentaerythritol (penta), an additive in paint and lubricants.

The existing Emerson RS3 distributed control system, one of more than 50 RS3 and DeltaV systems installed at Perstorp plants worldwide, has provided flexible and reliable control of the process since 1984. However, the need to run the plant continuously with continued high product quality and reduced downtime prompted Perstorp to plan for the time when spares for the existing system would no longer be available. Jorgen Annell, engineering manager at Perstorp, said: 'Perstorp has decided to invest in the very latest process automation technology wherever appropriate.

'Having considered a number of alternatives, we felt that Emerson's DeltaV system provided the advance control and batching features we required, while also helping to minimise process disruption and cost during the migration procedure,' added Annell. The Perstorp migration project will involve the installation of Version 11 of Emerson's DeltaV system. The system has an ISA88 batch hierarchy, with integrated functions such as simple configuration and scheduling, advanced control and multi-stream formulations and automatic data collection.

New displays help to improve operator performance by providing the clear and quick recognition of alerts as well as rapid access to the information needed to understand the alert and act in a timely fashion. The DeltaV v11 system was also chosen thanks to its I/O on Demand functionality, including Electronic Marshalling, to help minimise installation time and costly plant downtime during the upgrade. DeltaV Electronic Marshalling eliminates up to two thirds of the wiring and connections needed by conventional marshalling cabinets by removing the need to wire I/O to specific controller I/O cards.

Instead, Perstorp will deploy 792 single-channel Characterization Modules (Charms) to relay 3,000 device signal tags to 60 DeltaV S-series I/O modules. This wiring technology is expected to reduce downtime during this upgrade by two days, helping to reduce lost production. The migration procedure will be performed by Perstorp's engineering team and is expected to take two weeks to complete. The Perstorp pentaerythritol plant in Sweden is operated by legal company Perstorp Specialty Chemicals.

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